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Advice about Earthquake Safety

Berkeley Parents Network > Advice > Safety > Advice about Earthquake Safety


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Earthquake preparedness service?

Dec 2006

I know that there are pleny of disaster/earthquake preparedness kits available for purchase. We have some odds and ends tucked away. . . . But does anyone know of a service that will help us get truly organized: make sure we have all that we need, that it is accessible, that our disaster plans are sound. It shouldn't be so difficult to accomplish on our own. But since it isn't happening, we are ... Looking for Help


http://beprepared.com/article.asp?ai=45 I think this would help! christine

Water storage for earthquake supplies

Oct 2005

I am looking for a somewhat local source to purchase a 55 gal. plastic drum for water storage for earthquake supply. There used to be a source in Berkeley, but they are out of business. I have found a source in Idaho and another in Southern Ca. but shipping is very expensive. Does anyone know where I can get one. I also have many friends who are interested. Thanks.


Containers Unlimited
10901 Russet St
Oakland, CA 94603-3727
Phone: (510) 430-0503 
Sells new and used plastic and steel drums of all sizes. - Vicious Recycler
I was looking for a 55 gal drum for drinking water for a while, couldn't find one, but it occurred to me after a while that at 8 lbs/gal, a full 55 gal drum would weigh 440 lbs and be a real problem to move. Besides that, you can't just pour out of it easily, it takes either a pump or a special stand that stores it on its side. So I forgot the drum idea and bought a number of 7 gal plastic containers from REI - later found them at Wilderness Exchange for about a dollar less. These are made specifically for drinking water, food-grade plastic plus there's a faucet that lets you put the container on a table top and easily draw off water. At 56 lbs full they're not really easy to handle, but manageable. Grandpa

Buying an earthquake emergency kit

Sept 2005

I'm in the process of trying to prepare emergency kits for our family to use in case of an earthquake or other emergency. I've been innundated with lists of what to gather together and pack so I don't need help there. However I've noticed that there's many many companies and catalogs that supply prepackaged ''survival kits'', and would like to buy one. (Usually includes first aid kit, food bars, flashlight, radio, etc. and we would add to it.) It seems there is a great variety in prices and possibly quality between the products of these companies. Can anyone suggest a reputable company that provides safety/survival gear and equipment? Online or local. Thanks very much. Susan


There is an earthquake store in Emeryville on Hollis, around 62nd street. You can't see it from the street, as it is tucked away in a building. You can find them in phone book; I'm sure the name starts with Earthquake, and it may even be the Earthquake Store. I purchased some home emergency kits and supplies from them, and I purchased some larger, institutional supplies from them for my son's school and for my previous workplace. They are very nice and extremely helpful regarding what you'll need for what type of location for however many number of days. Need to Make A Visit There Too
I bought several kits from the Red Cross on line - they're very complete and seemed the best deal. Elena
The Red Cross has emergency kits. They also have lots of other useful information. You can find them online. doctorsydney
I tried to order from Quake Kare, Inc right after Katrina. I guess everyone had the same idea! After nearly a month, my order had not even shipped. They did not tell me that there would be a several week delay and they did not reply to my emails. Finally I got someone on the phone and cancelled my order due to poor customer service. After spending time online looking for another supplier or a local store where I could go, I finally decided to try Amazon.com. Not only did they have a kit instock (although they are sold out of some), but they were offering 25% off and free shipping. I just placed my order! Preparing for the ''big one''!

What kind of container for earthquake supplies?

May 2005

Now that I have children I'm finally thinking about putting together that earthquake preparedness kit. I am wondering if experienced folks out there recommend a particularly good box/storage unit to use outside. Looking at the recommended items for 2 adults, 2 children and a dog, it seems like I'd need a pretty good sized container. Thanks, Rachel


we used two smallish rubbermaid containers, the black and gray ones with snap-tight lids. smallish - is ~12x18x9 inches maybe? (I'm not going to crawl under the bushes and check! :)) You might want to use 2-3 smaller containers to make it easier to store them as well as easier when you want to remove expiring food stuffs and easier to move if they are ever needed! shaken not stirred
Good for you getting around to this Bay Area essential! If you have space, do one wheeled garbage can (so you can move the stuff to a safe spot), and then either another garbage can or a plastic bin with a tight lid to store additional canned food, blankets etc. in case you just have to camp out in your backyard for a while. Ideally, within the wheeled can, have a backpack or two with only truly essential items, in case you have to evacuate quite far. Keep some in your car at all times, too. I line the can with a havy-duty garbage bag, and within that, put items into zipper-loc bags. Tuck the liner-bag inside the can (not hanging over the edge, and put a bungee over the lid to keep it secure. There are spiders along the edge, but everything inside seems fine even after several years. Don't seal the zip-lock bags, though, because then condensation might be a problem. R.K.

Earthquake-safe wall decor

March 2004

I recently vowed to stop living like a college student and finally fix my place up. I have a couch in the only logical place it can go in our living room, and above it is a BIG blank wall. It looks stark and ugly. Same goes for the blank wall over our bed. I've read that it's not safe to hang items of any weight above beds and places where you sit. What then to do with the blank wall? Beth


Although I've hung pictures with shatterproof glass and shrinkwrapped posters, the best is textiles. A fun piece of quilt or handmade rug are classic choices. But antique clothing (kimono, lacy child's dress, beaded fabric hats from indigenous cultures) or a collection of soft handmade dolls can be wonderful. These can be hung directly on a wall or nailed over a piece of rice paper or fabric already tacked to the wall. I have seen paper cutout silhouettes mounted on rice paper and fabric that way. Long Chinese paper scrolls are grand. The truly skilled paint a mural directly on the wall. I personally hung a large Japanese resist cutout used in printing fabric that I got for nearly nothing at a yard sale. Good luck! goldman
I'd consider the risk acceptable as long as you have your artwork securely attached to the wall. There are plenty of strong hooks and hanging products available for the purpose.

However, there are also good options for lighter, softer and safer decorative items. Textiles can be a good choice - - painted silk hangings, batik cloths, tapestries, quilts. Or put up (securely wall-mounted) shelving and fill the shelves with baskets, stuffed animals, or other collectible items.

If those options don't appeal, instead of mounting a painting on the wall, you can simply paint the wall itself! A mural (or other decoration applied directly to the wall) is most often used in bedrooms, but you can certainly do them in other rooms, and it can be any style, color, etc. you like. Holly


For the bed, maybe a large headboard bolted to the bed or the wall. Or decorative mosquito net hung from the ceiling. Or fabric curtains on the wall, draped and arranged. Many ideas in the catalogs. For the couch, bolt a proper picture to the wall. Or just put up a poster. Or a tapestry. Or vintage jewelry on pushpins. Display your hankerchief collection. How about postcards? Maybe a mural painted directly on the wall. sunsolsal
You could hang a beautiful quilt or tapestry, or (depending how formal your room is), a dry-mounted poster that is not framed or under glass. For heavier items, it is possible to hang them safely - but you shouldn't use the regular nailed-in picture hooks. Buy some of the special ''earthquake-safe'' ones. There is a closed-loop version(you have to thread the hanging wire through, and then re-fasten it to the frame), and a kind that has a sort of ''maze'' the wire is pulled down through - so it can't ''jump'' up and off the hook. If the artwork is very heavy, definitely have it hanging from at least two hooks, secured into the wall studs with long lag-screws. If it a framed picture, I recommend replacing the regular plate glass with acrylic or safety-glass. R.K.
There are earthquake safety straps for heavy ojects that hang the wall. You attach them to the picture and then clip them on to a hook that's been put into a wall stud. We got some off a baby proofing website, but I've also seen them for sale on earthquake safety websites. So you could hang a painting over your couch.

As for the bed, I would hang a tapestry - such as a kilim rug, a weaving, etc. It's light and decorative. Another alternative is to paint the headboard wall a different color than the rest of the room or do a faux finishing technique on that wall. Anon


Moving to the Bay Area - worried about earthquakes

May 2003

My family is moving to the East Bay in about a year and I can't help but be worried about earthquakes. I know that there are zones that are considered more of an earthquake risk than others. Does anyone have some words of wisdom for me on how to live in an area like San Francisco/East Bay where earthquakes are a part of life. Can anyone recommend areas that are considered more protected than others? How is day-to-day living effected (ie- Do people ''earthquake-proof'' their homes like they might childproof them?)? thanks,
shakin' in my boots


I'm from out of town too, and this is how I've dealt with these worries

1) bought a good earthquake insurance policy (available even if you're a renter)

2) earthquake-proof my house (e.g. buy kits to strap large pieces of furniture to the walls). In addition, keep a ''disaster preparedness'' type of kit around (food, water, space blankets, matches and candles, first aid kit...)

3) realize that everywhere you live, there's some disaster waiting to happen (hurricanes in the southeast, tornados in the midwest, plane crashes, car wrecks -- even earthquakes in all kinds of places where they weren't expected before). Since I've taken all reasonable precautions, I force myself to quit thinking about it. If God wants to call me home, he's going to do it, and there's nothing I can do about it. I'm a natural worrier, so this takes some effort, but I do work on it.

Karen


I don't worry about earthquakes. I have lived in the Bay Area my whole life (30 years) and there has been one really bad earthquake here. There's nothing you can do about it, really. Have your earthquake supplies handy and have your home retrofitted to sustain damage in a quake... But I doubt that anything can really prepare us for a really huge quake. I am not trying to be fatalistic, but earthquakes are definitely something we cannot control or predict (no matter what the seismologists say). I say let it go. Worry free
Hi, before I get too far into this message (it's bound to be long), I want to mention a great website for lots of preparedness ideas www.preparenow.org. They have loads of links to preparedness sites, government departments, USGS maps of earthquake hazard areas, and other wonderful sites. Check them out!

I'm glad to hear you are thinking ahead about being PREPARED out here. I guess there are disasters to be prepared for anywhere-tornadoes, ice storms, blizzards, floods,...everyone should have basic preparedness stuff. But there are some EQ- specific things that help. You ask whether everyone does earthquake-proofing like childproofing here. The truth is, some of us do, but most still live in denial! There are lots of things you can do to improve your preparedness at home, such as securing tall furniture to walls (and tall doesn't just mean 6' tall - you wouldn't want a 4-foot bookcase full of books falling on a crawling baby!); keeping emergency supplies (foood, water, first aid, flashlight, blankets, etc.) in an easily-accessed place; being sure the water heater in your home is properly secured (one piece of plumbers tape across the front is NOT adequate); seeing to it that the house/building you live in has been retrofitted to resist EQ forces(if it is new, it should be built to current codes, but many older buildings have not been strengthened). Of course, this only helps in your own home. Compared to places like Algeria and rural Turkey, the SF area is extremely EQ-safe. Buildings are, on the whole, safer, and of course all new censtruction is built to strict codes. However, your child's friends' families might be in the ''denial'' category. So your child might end up sleeping over at someones house, right under a 7-foot tall full china cabinet that has not been secured in any way. Also, I have found it pays to ask your schools and daycare providers what they have done. Preparedness plans are required, but some are better thought-out and implemented than others. If anyone wants more suggestions, feel free to e-mail me (I do not represent myself as an ''expert'', but I have done lots of research). rkonoff


Well, of course we're all living in denial, and that's the only way to live here--because if you think about it all the time, you'll go insane.

But here are a few things to give you perspective and/or advice

--the closer you are to the water, generally, especially on flat ground, the worse off you are. This is because much of the land on the bay is really fill; on older maps, this ''land'' shows up as water. If your house is on sloping ground inland, you're probably on bedrock. You can also check out http//www.abag.ca.gov/bayarea/ eqmaps/pickcity.html to find earthquake hazard maps for specific cities.

--generally, the newer your house is, the better, because earthquake codes have improved; but you have to take into consideration size and building materials. Therefore concrete apartment buildings with parking garages on the first floor (circa 1960s) are a bad bet compared to a Victorian single family house, because the former tend to ''pancake'' in a quake, while the latter will just dump a little gingerbread woodwork around your ears.

--if you're buying an older house, there are types of seismic reinforcement that can help a lot; namely, bolting your house to the foundation (older houses just sit on top of their foundations) and covering the cripple walls (i.e., portion of exterior walls between foundation and floor joists) with plywood, which adds shear strength and stability.

If I wanted maximum peace of mind, I would live in a single-story wood-frame house with no exterior masonry, either new or seismically reinforced, in a nice hilly place like Rockridge (that's rock under your feet!) or North Berkeley. And then I would chill out and enjoy the weather.

Not a geologist, but I play one on TV


You can check out www.abag.org for information about earthquakes, particularly there are maps of shaking intensities and likely damage. I was hesitant to tell you about those, because they look scary, particularly to someone who's not familiar with earthquakes. But they will give you an idea of what areas are more or less earthquake safe. Basically proximity to a fault line that's due for a quake and sitting on land fill are the two big issues. When we were house shopping, we avoided Alameda and other areas of land fill. We ended up buying a house in the El Cerrito hills, which is very close to an active fault, but is on solid ground (not true of much of the hills). As for day to day living, you can't let it bother you too much. People do prepare for earthquakes by storing food and other necessities and having an exit strategy from their homes. It's also important to bolt tall furniture to walls. There's a big industry for earthquake retrofit of houses and some cities will even give you a credit on your tax bill. It important to have the house bolted to the foundation and shear walls installed. These are not particularly expensive fixes. Lori
Yes you earthquake proof your house the way you child proof it. It might ease your mind to find out what you need to do to make your house earthquake safe. I'm sure you can find a website that gives ideas for earthquake safety. Also, if you are buying a house, you'll have it inspected and they'll tell you if there is anything you need to do structurally to make your house safe in an earthquake. If it makes you feel any better, I've lived here all my life and lived through lots of earthquakes including two very large ones, the loma prieta here in Oakland and the Northridge quake in Los Angeles. They can be very frightening but if you are not living in a hazardous environment, they are usually not harmful. You might also want to find out what you are supposed to do during an earthquake which I am sure you can find on a earthquake preparedness web site. It won't be so scary if you are prepared. Danielle
You don't say where you're moving from...do you live in an area where there are yearly hurricaines, tornados, debilitating snow storms?

Yes, California is known as earthquake country and there have certainly been a few big ones in the last century (and even last few decades), but I think most of us live our lives without thinking about it much.

Many homes are earthquake retrofitted on the foundation, most people I know have an emergency stash outside the house of food, blankets, tools, etc. just in case. Some people have earthquake insurance. Schools have emergency earthquake procedures to follow, in case. We are educated in disaster procedure in the event.

I'm not a geologist but I do know that we have lots of teeny to small earthquakes all over the place and once in a while there is a biggy centered somewhere that causes damage in one area and maybe it's felt slightly in distant areas. There are faults all over the place, some bigger, some smaller. I don't know that any one area is ''safer'' than any other. Our house is 1 1/2 blocks from the Hayward Fault but our neighborhood is built on solid stone. Don't know if that makes any difference.

I imagine at some point the Bay ARea will have another disasterous earthquake (they say we will). It could be in 20 minutes, tomorrow,or not for many years.

My husband, born and raised in Berkeley, always says he'd much rather live here where there are occasional earthquakes than in the midwest where tornados are a way of life, or in the east where hurricaines are pretty much guaranteed every season. So, good luck on your move. California is beautiful, the whether is great(or is it weather?), good food,diversity, great people. You'll learn what safety precautions to take. Be sure you do that, then relax and enjoy. June


Here are some websites that might provide you a little more feeling of control during the transition to the Bay Area. There are natural disasters in all parts of the world that one should be prepared to face, depending upon where you live (I grew up with tornado shelters). Having a plan and rehearsing it, knowing your neighbors, and making your house and belongings as secure as possible are the measures you have control over. You might want to have a geological assessment of the land your prospective abode sits on, to determine which areas are most stable. A good realtor will also be able to provide you with stability information about certain areas over others.

Home prep http://www.preparenow.org/ba-eprep.html

United States Geological Survey--search by state or disaster type http://www.usgs.gov/

Neighborhood groups ask the police or fire department in your prospective neighborhood if there is an active Community Emergency Response Team (CERT) in that area.

Other good information (many categories) for the Bay Area can be found by searching on http://www.craigslist.org/

Welcome to the area! Amy N


I have lived in the Bay Area my entire life (minus a few years abroad in my twenties), and been through at least 3 major quakes that I remember. There's lots of little ones that we just don't ever feel. I am WAY more afraid of tornadoes and hurricanes than earthquakes.

We live on a fault line, and have done some work on our house (bolted the foundation, etc). We also have an emergency stash of food and water, flashlights, etc. The Red Cross has great info on how to eathquake proof your place at http://www.redcross.org/services/disaster/keepsafe/readyearth.html

Friends I know that have also lived here since birth joked during the dot-com days that we needed a good earthquake to scare away the dot-commer's ) It's truly not a part of our everyday living-- it seems to happen way less than flooding, hurricanes, or tornadoes in other parts of the US (all are way more scarier for my family!).

Good luck with your move! earthquake veteran


I have lived in the Bay Area my whole life (34+ years) and the only ''real quake'' that I can remember causing any damage is the 1989 quake that caused the Cypress Structure to collapse and even then I didn't even lose power at my house. I only lost 1 trinket and that was because one fell on top of another that had fallen. A lot of others fared worse. I do use museum wax on collectibles and strap my furniture to studs and such but I guess living here I am not too worried about it. I also take the regular precautions of having an emergency kit with food and water, blankets and extra clothing in case something did happen that we couldn't get into the house. And I also have routes mapped out of how we would each come home from work for our sitter and family. Do your best to prepare but don't let it run your life. Pat
All the suggestions given already are good ones. I’d like to add that it’s a good idea to keep your emergency supplies outside rather than inside- you may be able to get out of your house okay but it may not be safe to re-enter it. I keep mine in 3 large trash cans in the backyard away from the house, the lids secured with bungee cords, and a week’s supply of enough water for me and my pets in water jugs from the surplus store.

Inside the cans, although I’ve never had any problem with water getting in, I keep everything in well-tied trash compactor bags (the strongest bags you can buy). In one can I have the things that I might need right away such as one change of clothes, first aid supplies (I put them together myself as the ones you can buy are very minimal), flashlight, a battery and hand crank powered radio (Grundig), batteries for both separately from them, little quickie food, a month’s supply of medications that I take regularly, a list of phone numbers & info like for my home insurance etc, an extra credit card that I don’t usually use, and $400. cash in small bills.

In the other cans I have more clothes, more batteries, more food, a camping lantern, a small cook stove, blankets, rain gear, a small tent, pet food, etc.

Several neighbors and I got earthquake gas shut-off valves several years ago made by Vanguard (they were about $250.00 installed). Apparently some of the earlier valves made were overly sensitive but these are just fine, and it gives extra piece of mind.

I took a class from the City of Berkeley a few years ago in Emergency First Aid- it’s not only about care you can give yourself, but how you can help triage injured people for care from other people around and professionals. They have other emergency preparedness classes also.

I also keep a small stash of emergency supplies such as change of clothes, a jacket, a space blanket, quickie food, smaller first aid kit, water, and cash, in my cars.

I had earthquake insurance for several years and then cancelled it. The deductible was so high that it just didn’t make sense. My one-story, wood frame, retrofitted house would be most likely to get a lot of broken glass and damage to possessions- less value than my policy would have covered (I don’t believe it covered possessions anyway). I checked, and fire resulting from earthquake is covered under my basic policy. This is from CSAA

Someone mentioned home inspectors for checking for structural problems. Most home inspectors are general contractors, not engineers, and look at basics but not structure in detail. For that you need an engineering inspector. Two that I know are Dan Szumski 839-0399, and Ralph Kratz 215-2430.

Oh yes, one more thing. Somewhere I read or heard that it’s a good idea to keep a large crowbar under your bed so that you can move big obstacles if you need to in order to get out.

Not in Denial


Earthquake Plan for nanny

Feb 2003

I'm in the process of devising a communication/shelter plan for my family and our nanny in the event of a major earthquake or other disaster. My biggest concern is that my husband and I will be at work when disaster strikes, and our nanny will be left to her own devices with our 10-month-old daughter. Our nanny is intelligent, but she has not been in this country long, and she has never experienced a major earthquake. Have any of you given your childcare provider specific instructions on what to do in an earthquake? Have you given instructions on when to leave the house, when to go to a shelter, how to find a shelter and how to get in touch with you should the phones be out of service? Have you arranged to meet at a specific spot? Leave messages at an out-of-state number? Any advice you have would be most helpful. Thanks! Amy


I wouldn't feel any qualms about talking to your nanny about an earthquake plan. If she's never been through an earthquake, all the better a reason to do so. I would just suggest you do so in as calm a manner as possible so as not to frighten her. You might also check out getting an earthquake supply kit for her car or an extra one for your home that will contain the things she need fto care for herself and your child until you all can be reunited. Carolyn
We have implemented a ''disaster plan'' for our nanny in the event of an earthquake, natural disaster and let's hope not but a terrorist attack.

Having read the American Red Cross advice as to what to do in the event of an earthquake, I have typed out instructions to stay in the house, go under a table or doorway (etc). We have instructions to not go go into the kitchen, turn on lights and to stay in one room. Also, she is to call out of state grandparents if she cannot get a hold of us in case lines are down. We have also set up two meeting places in the event that it is not safe to stay in the house. Also, she knows where to find flashlights and radio in the event the power goes out.

If she is to leave the house, we always have our son's backpack ready with his supplies, water, bottles and formula.

I think it is always a good idea to have an emergency plan- our's is typed out and clearly posted on our fridge with all important numbers. However, I also went over the plan with our nanny to make sure our nanny knows what to do. The more prepared you can be, the better everyone will feel.

Good luck and stay safe! Let's just hope you will never have to use the plan! Stephanie


Our babysitters and houseguests are shown a bright red binder which we keep with the cookbooks in the kitchen. It contains emergency information which can be consulted or taken along in case of medical emergency or evacuation. There are three pages:

=Where to Find Us and Today's Information=

This is a blank form which I duplicate and fill in each time. At the top it has our pre-printed cell phone numbers, and it also lists the phone numbers for wherever we'll be (work, restaurant, theater, hotel, etc.) When the kids were small it also contained information on when/what to feed them, bed times, etc.

=Emergency Information and Contact List=

With first-time sitters I review this information in person. it includes our home address with cross-street and home phone number(in case, heaven forbid, they have to call an ambulance), our cell phone numbers, phone numbers/addresses of neighbors, nearbyfriends and relatives and the Kaiser advice line.

A separate section contains information on location of earthquake, medical supplies, and fire escape ladders and the phone number of out of state contact.

If your nanny is not familiar with what to do in an earthquake, you of course need to review some basic concepts such as not running out into the street but finding a doorway, interior hall, etc., and keeping kids calm and safe. It includes recommended meeting places if the house has to be abandoned, and a reminder to leave a written note as to where they've gone.

=Emergency Medical Information and Authorization=

This form can be taken to the hospital and is also a good form to give to a friend of relative who is having your child for a sleepover in case they can't contact you. It contains address, phone number, and driving directions to Kaiser pediatric office and emergency room. It also reiterates names and numbers of friends and relatives to contact in an emergency. At the bottom we sign an authorization for emergency medical care.

If anyone wants a copy of these documents to modify for their own use, I'm happy to send them. Natasha


Evaluating earthquake hazards when looking for a house

December 2002

We have recently realized how little we know about seismic hazards. Has anyone found a good book or other resource that explains what to consider when looking at potential houses, schools or daycares? We are concerned about buildings' locations relative to fault lines and other seismic hazards as well as their structural integrity. For example, how risky is it to move into a house or send our kids to a daycare located right on a fault line or in a liquefaction area? Are older, two- story homes in any way less safe than one-story homes? Our ''dream house'' would be a two-story Victorian or craftsman, but someone told us that shaking on a second floor is exponentially worse than shaking on a home's first floor. We would really like to find a good source of information to answer these and other questions that may arise as we think about where we want to live in the Bay Area. Thanks for your suggestions! Kathryn


Nolo press has a great book called ''How to buy a house in California'' that we relied on heavily when buying our home. Jill

Buying a house on a fault trace

September 2002

We are thinking about buying a house that is located on top of a fault trace. Does anyone know what that means, exactly? How bad is it? Someone told us that it could actually be better to be located right on a fault line, because the worst shaking may occur further away. Is there any truth to that? Also, this property has a creek running through it and seems to have a rather high water table (a neighbor told us that she hits water when she digs in her yard). Could the amount of water in the earth make it particularly unstable in an earthquake? Is there a reliable, free source of information about these kinds of things (a government engineer or someone like that) whom we could contact? Thanks! K


From my friend at the USGS - There are active fault traces and inactive fault traces. If the question is about an active trace (part of the Hayward fault zone)....Yikes! The best situation is to be on stable material (bedrock or old alluvium) as far from the fault as possible. The water question is not an idle one, because an elevated water table is often related to the presence of a fault. However, there are lots of fault traces that are not currently active. The best website to find out about predicted shaking is the Association of Bay Area Governments' ''On Shaky Ground'' site, http://www.abag.ca.gov/bayarea/eqmaps/eqmaps.html They also have a lot of other natural hazard info there. That's the place to start.

To find out where a known active fault is, consult the California Geological Survey. Their site is http://www.consrv.ca.gov/cgs.

If the person wants site-specific information, they will have to hire a consulting geologist or geological engineer (He thinks this costs a few hundred dollars). Hope that helps. Angie


This is short, but without knowing this person's situation, the following gives a some idea of potential problems with living on or close to a "major" fault.

If the house actually straddles the trace of a major fault this is a bad situation that should be avoided. If the home is close (ie.within about 1/8 mile) to the trace this is a little better. However, for very large faults with lots of slip over time (ie. San Andreas fault which has had displacements of hundreds of kilometers) the "damage zone" can be quite large. This is a zone of crushed rock and defines the fault zone, not just a vertical crack that most people envision the fault to look like. This crushed zone (fault gouge) causes water to accumulate (sag ponds...., San Andreas lake is a good example) and also causes streams to pop up and hence raises the local water table. Saturated crushed rock under strong shaking conditions can result in complete ground failure (liquifaction), not to mention amplifying the ground motion and hence stronger shaking of any structures. With that said, this must all be caveated with some questions, "what kind of rock or soil is the home built on?" , "what fault is the home built next to?", "what is the structural integrity of the home?" etc. If it is a small fault with little past displacement it is probably not that bad of a situation. Some homes in the Berkeley hills very close to the Hayward fault are actually on fairly competent soil and rock. If the earthquake does not rupture up to the surface, then the shaking near the fault may be comparable to shaking in the flatter parts of Berkeley that are located farther away. However, if the fault does rupture up to the surface this is a very bad situation because this creates much stronger ground shaking right near the fault trace. (as an aside, some of the larger more recent earthquakes in California have failed to rupture up to the surface e.g. Loma Prieta, Northridge).

In summary, it is best to have a home located on stiff soil or rock that is made of wood framing (flexible) that has been seismically retrofitted to prevent cripple wall failure with a good foundation. If the home really does sit on the mapped trace of the Hayward fault for example I would avoid it.

One resource to consider is the California Division of Mines and Geology. I believe they have on-line shaking maps for different earthquake faulting scenarios. -Kevin


Buying a house on the Blakemont Slide

August 2002

We are looking at buying a house in the southern part of El Cerrito and was advised by our agent to look into the ''stability'' of the land upon which houses ar located. We have seen houses we like on Seaview drive but understand that this is in an area called ''Blake Mont Slide'' and that the ground might be less stable here than elsewhere. Is this correct? Does anybody have some updated information/facts on this? The earthquake related maps on the Web does not address the issue of land-slide. As much as we would enjoy having a spectacular view, we wouldn't want waking up one morning finding ourselves at the bottom of the hill or worse) Any insight is greatly appreciated! Per


Hi - When we were looking for a house in the Kensington/El Cerrito area, our realtor strongly advised us against buying any house in the Blakemont slide area. I don't know if Seaview is part of the area, however. I know the slide area includes some streets around the cemetery (below Sunset and above Colusa, I think), but I'm not sure which ones. My impression is that the more experienced realtors know where the slide area begins/ends -- you could also call the city of El Cerrito and the town of Kensington and probably find someone who knows. Good luck. Cathy
We live on Sea View Drive outside the Blakemont slide area. I'm no expert, but I drive through the area daily and have some observations. When we bought our house in 1994, our agent showed us a slide map of the area, so you may want to ask about this map. The slide area is unstable to the point of breaking water lines (EBMUD repair crews are a fixture in the area). During winter, many residents drain their gutters to the street to try to keep water from soaking the soil any more. Most notably, about 1-2 years ago, many of the residents in the slide area were discussing the idea of a tax assessment district to raise money to improve drainage. You should find out about this tax (did it pass? how much is it?). There are a number of documents, including the study prepared for the tax proposal, on the overall situation and your Realtor should be able to provide them to you. Finally, you might want to talk to some of the people living on Eureka between Sea View and Franciscan Way and see what they have to say. Jon
Sorry for the late reply-but if you are still interested in buying a house on the slide area, you should really call and talk to my husband, Bill Langbehn. He is a geotechnical engineer, who has extensive knowledge of this area. He has done several studies of existing properties in and around the Blakemont slide. He is full of information and advice. He does do real estate inspections, too. You should give him a call and just ask his advice. His office number is 510-558-8028 (in El Cerrito). Kerri Langbehn
The Kensington Library has a thick file with maps and information on the various homeowner efforts regarding the Blakemont Slide. It's in the slideing file drawers of local stuff.
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