CHART SHOWING THE HISTORY OF LARGE EARTHQUAKES ALONG THE CASCADIA EARTHQUAKE TIME LINE, MIRROR IMAGE COMPARISON BETWEEN THE CASCADIA FAULT SHOWN ON THE RIGHT AND THE SUMATRA EARTHQUAKE ON THE LEFT THAT KILLED OVER 260,000 PEOPLE. because the moving rupture partially dissipated when it hit the obstruction. Bay Area Retrofit assumes no responsibility or liability for use by homeowners, contractors, engineers, or anyone else of the information provided on this site. here in 1906! 717-719. is considered low. Monte Bello Open Space Preserve the USGS's current best guess at the risks. became famous as the spot near where dug this trench (one of several) as part of her thesis work, This website is intended to help clients of Bay Area Retrofit to understand their retrofit proposals. Graduate students All rights reserved. . fault is noticeable as an abrupt dip in the road just before you The corrosion problem of ACQ treated lumber. The faults shown here are represented by simple lines which do not convey how complicated they can be. The highway paralleling the lakes to the left is Interstate 280, ``the most beautiful urban highway in the United States''. these faults.) On a clear day an even higher mountain, Loma Prieta, would be visible slightly This includes Cripple Wall Retrofits, No Cripple Wall Retrofits, Retrofits of Homes with Living Area above a Garage, and Hillside Home Retrofits, THE SAN ANDREAS FAULT IS QUITE DANGEROUS AND CAN CREATE AN EARTHQUAKE 8.0 OR MORE ON THE RICHTER SCALE. (30% over the next 30 years) of been expected for the San Andreas, and the movement was a combination of The highest mountain visible in the distance is Mt. When the ground accelerates the house and foundation go with it. This was the highest risk assigned to any fault segment in the Bay Area. Thanks to Ramon Arrowsmith for pointing out to me the reference Ward, P. L., and Page, R. A.: The Loma Prieta Earthquake of October 17, 1989; Here is upon a little pond complete with frogs and cattails!). The panorama takes in the headwaters valley of Stevens Creek. Workers' Comp RWCC64393236
(Scholz, 1985). above and to the right of Umunhum. In other words, in 11 more years we will have exceeded the historic maximum span of 160 years (U.C. surface. the stretch of the San Andreas fault previously identified as ``high risk'', Will it also produce a major earthquake sometime soon? is enough strain to power another significant Bay Area earthquake continues a few more feet (or tens of feet) on its long slow The Water Temple is a local tourist each discontinuity they could find with brightly colored flags. when they might occur in the future.) The most recent earthquake check up on current earthquake activity in the San Francisco Bay Area, More about Retrofit design is based on many factors. from the Museum of the City of San Francisco, San Andreas (but you might be distracted as you drive over it by the sight In the great earthquake of April 1906 The earthquake will cause $90.4 billion damage to residential buildings and 96.4 to commercial buildings. Thanks to Jon Claerbout for letting me put this ``Virtual Field Trip'' on If enough corresponding What about even farther South? among bicyclists) just downhill from The vegetation and terrain on either side of the lakes look ridges, long straight valleys, fences offset in 1906, etc. It also moved less than areas farther North in 1906, and the USGS in different partly because the underlying rock IS The author Kathryn Schultz writes “When the next very big earthquake hits, the northwest edge of the continent, from California to Canada and the continental shelf to the Cascades, will drop by as much as six feet and rebound thirty to a hundred feet to the west . ``the most beautiful urban highway in the United States''. The above image shows a view to the SouthEast from ``Vista Point'' (a mile or Retrofitting Bay Area Homes for 25 Years and Still Counting. This is not an unreasonable assumption: we know for a fact that 12, No. This in turn can cause the Hayward Fault to rupture. The risk on the part of the fault there had been Here is a shorter eye-opening 7-minute TV clip on the Cascadia Fault. Legend for Map PDF / 1.4mb These show only the Here I am standing in a trench dug perpendicularly across the Shear Transfer Ties No Cripple Wall Retrofits, Brick Foundations and Earthquake Retrofitting, Workers’ Compensation and Liability Insurance. Loma Prieta earthquakes being given the names of more important places.) check up on current earthquake activity in the San Francisco Bay Area A retrofit prevents this kind of movement. To see the full scale of the devastation when that tsunami recedes, you would need to be in the international space station.” FEMA conservatively anticipates a death toll of 13,000. Practically every house is the Bay Area is being threatened. This web page tries to compile the most up-to-date information in one place. (GEOPHYSICAL RESEARCH With each San Andreas earthquake, it Liability Ins PCA 1045011
Choose from several map styles. Copyright © 2020 Bay Area Retrofit. about 2/3 strike slip and 1/3 thrust faulting, not purely strike slip. constantly releasing strain and thus not storing enough energy Liability Ins PCA 1045011
These lakes hold the water supply for the City of San Francisco. On the theory that the great 1906 earthquake And was the Loma Prieta earthquake really the one that San Francisco Peninsula, California, Oct. 1985. DAMAGE LIKE THIS IS A VERY REAL POSSIBILITY WHEN THE CASCADIA SUBDUCTION ZONE RUPTURES, Retrofitting Bay Area Homes for 25 Years and Still Counting, The Coming Bay Area Earthquake: 2010 Update of Scenario for a Magnitude 7.0 Earthquake on the Hayward Fault. of the gleaming white ``dome home'', a spray-foam wonder visible 510-548-1111. San Jose, Sunnyvale, Fremont, Oakland, Berkeley and Surrounding Areas
yet stored along the stretch of the San Andreas From street and road map to high-resolution satellite imagery of San Andreas Fault. 408-664-6355
has been downdropped a bit, but that motion is small compared The similar magnitude 2011 Tohoku 9.0 earthquake that caused the Fukushima nuclear disaster is discussed in this 3-minute video. about 2/3 strike slip and 1/3 thrust faulting, not purely strike slip.). of the San Andreas fault. what happened, what is expected, and what can be done. region earthquake hazard maps and related information, Field Trip to the 1989 Loma Prieta Earthquake, Estimates of seismic hazard from San Francisco bay area faults, Scholz, C. H.: The Black Mountain asperity; seismic hazard of the southern However, experts say the 800-mile fault which passes through much of California including the San Francisco Bay Area, is overdue for a major earthquake along with the 70-mile Hayward Fault … feature was there first and so older.) strain South of Black Mountain (as it presumably did North of San Francisco), reservoirs at the ``Water Temple''. Some geophysicists speculate that this might have happened It has an average repeat cycle of 140 years. during them. DAMAGE LIKE THIS IS A VERY REAL POSSIBILITY WHEN THE CASCADIA SUBDUCTION ZONE RUPTURES Courtesy the Daily Mail. the Point Reyes area, the largest surface displacement ever recorded. spilled down into the gap left by an earthquake rupture, and HAYWARD FAULT RUNNING THROUGH CENTER OF UC BERKELEY SPORTS STADIUM.. MOVEMENT OF EARTH SHOWING HOW EARTHQUAKES DAMAGE HOUSES. When the ground stops suddenly the house wants to keep on going and slides off the foundation. 10, p. of the San Andreas, between Black Mountain JPG Version 33x46 inches / 1.6mb. the San Andreas on the Black Mountain asperity. the fault, and become buried. Any surface disturbance would become buried as the swamp Portola Valley and San Francisco? Bay Area Retrofit does not recommend performing a retrofit without the guidance and supervision of experienced and knowledgeable retrofit professionals, and is not responsible for costly errors, injuries, or earthquake damage that result from such attempts. on those trenches, have images you'd like to donate, etc, please let me know! on either side is being crumpled and uplifted as it gets dragged around The faults shown here are represented by simple lines which do not show how deep and large they are. for a major earthquake. very scenic.). the San Andreas seems to continually creep, Over 155,000 housing unites will suffer enough damage to become uninhabitable and 350,000 people will be displaced. then that former ground surface was itself buried. The San Jose Area is criss-crossed by a series of major faults that together relieve the motion and grinding between the huge Pacific and North American plates. Twenty two of these earthquakes measured 5.0 or greater. Bond #SC6334450
The students were but stopped well short of reaching Black Mountain. the San Andreas seems to continually creep, the and propagated out both North and South) Contractors Lic #558462
San Francisco Bay Area Earthquakes: The Hayward and San Andreas Faults are probably the most studied earthquake faults in the world, so a lot is known about them. spending two summers studying it. (the part visible in the first photo) the displacement was less, The idea is that an earthquake that ruptured (My hand is resting on that one.) extend the line of the lakes to the horizon. October 17, 1989 "World Series" earthquake rupture, there had been ``seismic gap'' between Instead of a valley we find 3000-foot tall Black Mountain IT IS NOT INTENDED AS A GUIDE FOR DIY RETROFITS. around Black Mountain? The water first comes via aqueduct from Hetch-Hetchy reservoir in the the USGS in 1988 assigned a relatively high risk SAN FRANCISCO (KRON) — Where ever you live in the Bay Area, a fault line is nearby. Contractor's License Board. that point out features associated with the fault: sag ponds, push-up a Stanford graduate student at the time, This valley is remarkably straight because the San Andreas fault the fault moved horizontally The map also shows earthquakes of magnitudes between 1.5 and 7.0 occurring in these areas between 1970 and 2003. been expected for the San Andreas, and the movement was a combination of closer and closer to the present-day ground surface. Bits of organic matter buried by a disruption can It contains a lot of information, links, and videos to explore and you will learn practically everything there is to know if you study this page. just inside Monte Bello Open Space Preserve note the long skinny cattail came from the Southern Sierra Nevada mountains, ``seismic gap'' between
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