SF liquefaction map

Bay Area Liquefaction, Landslide, and Seismic Zones – Mapped

Lots of talk in the news these days about landfill, liquefaction, and general stability of property in and around San Francisco’s waterfront, and entire city for that matter (see “SF’s landmark tower for rich and famous is sinking and tilting“that hit newsstands and internets today [SF Gate/Chronicle]).

Big news, no doubt, but what about the rest of us?

I did a post waaaay back in 2010, preceded by the post I did even further back in 2008, both of which get hundreds, sometimes thousands of views daily, so I know for sure this is a topic of interest when buying/selling property in San Francisco. And since I get so many questions about whether the property you want to buy is, or is not, in liquefaction, let me be clear, I AM NOT A SEISMOLOGIST, GEOLOGIST, SCIENTIST, OR ANY TYPE OF OTHER EXPERT IN THE FIELD OF EARTHQUAKES, LIQUEFACTION, LANDSLIDES, LANDFILL, MUD FILL, BEDROCK, SETTLING, SLOPING, SLIPPING, SLIDING, OR ANY OTHER FIELD OF INTEREST THAT HAS LED YOU TO THIS SITE FOR KNOWLEDGE ABOUT LIQUEFACTION. I AM A REALTOR, AND EXPERT AT MARKETING PROPERTY FOR SALE, AND HELPING BUYERS BUY. WHAT I AM SHARING HERE IS MEANT TO BE A RESOURCE FOR YOU TO MAKE YOUR OWN EDUCATED DECISIONS. DO NOT RELY ON THE INFORMATION POSTED HERE FOR YOUR PROPERTY PURCHASE OR SALE.

That said, I want to share a new App/site with you: Temblor…all things Seismic. You have to check it out. It’s awesome, and will hook you in for hours.

Check out this screenshot of the entire Bay Area…including liquefaction zones, fault lines, and recent quakes.
bay area liquefaction zones

Now zoom in to San Francisco…
SF liquefaction map

As I sit in my home office, which, according to Temblor, is built in an area of “moderate Liquefaction Susceptibility”, and a “Seismic Hazard rank of HIGH” (I challenge you to move the pin and find an area in SF that is not “High”), it’s left me wondering…does this change anything for me, and my decision to own property where I do? No. It doesn’t. It’s better than a map telling me I live in an area of High Tornado Susceptibility, where I roll the dice on a pair of glass slippers showing up on my doorstep.

So, there you go. Plug in your address, your mom’s address, your brother’s address, your employer’s address and see how you all stack up. This is yet another amazing resource, thanks to the Internet, available to everyone and anyone with even a remote interest in Earthquake activity (I’m guessing that’s everyone in California, at least). And I’m pleased to be sharing it with you.

Full disclosure, yes, I chatted with the founders of this service, no, they are not paying me for this post. I have downloaded the app, and refer to it constantly.

Happy Monday.

Previous Earthquake related posts on theFrontSteps:

SF neighborhoods prone to liquefaction and earthquake induced landslides, bedrock vs. landfill take two [theFrontSteps]
Ask Us, A map of bedrock vs landfill [theFrontSteps]
Liquefaction Zones of San Francisco’s Marina District [theFrontSteps]

San Francisco Neighborhoods Prone To Liquefaction And Earthquake Induced Landslides (Bedrock vs. Landfill Take Two)

Back on February 15th, 2008 (yes, theFrontSteps has been around that long) we were asked by a reader if we knew of any good maps showing areas in San Francisco that are either bedrock or landfill. You’d be amazed how many people, to this day, read that post, and how many more emails we get asking if we have an even better map that will drill down and show the exact streets and topographic undulations as they pertain to a specific home/condo or listing.

Until now, we’ve come up empty, but we’re pleased to say, we have been informed of two new (to us) maps. One is a State of California Geologic map showing San Francisco areas prone to liquefaction (green) and “earthquake induced landslides” (blue), and you can really drill it down to the street you live on. (Click on the image to download the pdf and get your SF liquefaction/landslide knowledge on…quiz next week):

That’s a cool map. The other map is hidden in our MLS, and it allows us to layer the Liquefaction map over the listing location map. Do they give that access to you? Of course not, but we welcome you to contact us if you’d like us to research a listing for you (expect to work with us on the transaction, or tell your Realtor to do it for you).

Have a look at this property at 260 Green, a gorgeous 4 bed, 4.5 bath trophy San Francisco home in Telegraph Hill, with a recent price reduction from $12,900,000 to $11,000,000. By way of magic mouse clicking we’re able to tell you immediately if that home is in a prone area, and apparently price is not the only thing subject to sliding at 260 Green. (Obviously our one second look at a map does not compare to consulting with an expert soils or seismic engineer, so make sure you do if you have your eye on this property, or any others for that matter…okay.)

So that’s all great and what we can do for you, but what if you don’t want to contact a Realtor? San Franciscans, if you don’t know roughly where your home/neighborhood is on that map…you got issues. For the out of town readers considering a move to San Francisco, you can compare the liquefaction/landslide map to this San Francisco Neighborhood map. That will give you a good starting point. (For details go here.)

And in case you missed our original post and would like to know whether the chances of your house crumbling during “The Big One” are Very High, or Low (not just whether you’re in the zone), here you go: (the below map requires Shockwave)

liquefaction
Needless to say, if you live/plan on living in an area of green (first map) orange or red (bottom map), you better know how to duck for cover, and know that earthquakes don’t discriminate based on property values…if you’re in the zone, you’re in the zone. We hope “The Big One” never hits, but we all know it’s a matter of when, and not if, so choose your property location wisely, inspect, inspect, inspect, and remember to do those seismic upgrades you’ve been putting off for so long.

[Update: As is often the case, our readers are more bad ass than we are, and so provided a link to a soil stability (types) site: Click here to see it.]

IF YOU’RE LOOKING AT THIS POST CONSIDERING WHERE YOU WANT TO PURCHASE OR NEED TO SELL PROPERTY IN SAN FRANCISCO, IT’S BEST YOU CONTACT ME! I can get into details with you.

Map of San Francisco locations prone to Liquefaction and Earthquake Induced Landslide [State of California Geologist]
SF Districts Map (Not the totally new one with new zones, but close enough)[SFAR]
Map of Bedrock Versus Landfill San Francisco [theFrontSteps]
Contact Us to Check Your Property Liquefaction/Landslide Location[email thefrontsteps@gmail.com]
Map: Bay Area’s Biggest Earthquakes [theFrontSteps]
Liquefaction Zones of San Francisco’s Marina District [theFrontSteps]
Bay Area Liquefaction, Landslide, and Seismic Zones – Mapped [theFrontSteps 8/1/2016]

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