Earthquake information for san francisco, california. Understanding the materiality of the earthquake risk is a complex operation that requires the intervention of intermediary actants, the maps, to both describe, understand and communicate the risk. Liquefaction risk in sf san franciscos coastline looks different now than it did 150 years ago. The 2008 ucerf2 report calculates a 63% probability that the bay area will suffer a magnitude 6. Earthquake inform ation for san francisco, california. Using gis for assessing earthquake hazards of san francisco bay. This earthquake is similar to the 1906 san francisco earthquake. The next big earthquake in the san francisco bay area may come. Realtime notifications, feeds, and web services get realtime earthquake notifications sent to you on your phone or by email, or subscribe to realtime feeds. The 1906 earthquake left 225,000 of san franciscos 400,000 citizens homeless. Seismic hazards maps for the san francisco bay area. The most active faults in the region are the san andreas fault and the hayward fault. Additional products of this research include postscript and pdf files of the. New report finds overlooked earthquake vulnerabilities in.
The map is based on the most recent usgs models for the conterminous u. When it comes to modeling earthquake risk assessment, disaster managers and. Earthquake risk in residential buildings david bonowitz, s. If you live or work in the marina, soma, fidi, the mission, mission bay, dogpatch, or hunters point, you likely do. Disaster management and mitigation for earthquakes. These maps are designed to give the general public as well as landuse planners, utilities and lifeline owners, and emergency response officials, new and better tools to assess their risk from earthquake damage. As sf developed and grew quickly, the city expanded our scraggly coastline into a smooth, straight line by.
Apr 04, 2019 the california earthquake hazards zone application eq zapp is an onlin e map that allows anyone with a computer, tablet or smartphone to conveniently check whether a property is in an earthquake hazard zone. Liquefaction susceptibility maps of the central san francisco bay region at 1. San andreasnorth golden gate earthquake magnitude 7. Click here to find out what to do during a tsunami, if you live in, work in, or visit san francisco county. An earthquake on the seattle fault poses the greatest risk to seattle. If a major earthquake were to occur near a highpopulation area, insured losses could exceed usd 100 billion. In this close study of the 1906 san francisco earthquake, joanna l. These are the largest type of earthquakes in the world. Using newly collected data and evolving theories of earthquake occurrence, u. This paper addresses the preparation and development. The maps also contribute to the california geological surveys seismic hazard zone maps.
Larger earthquakes are represented by larger circles. Apr 18, 2006 california department of conservation administers a variety of programs vital to californias public safety, environment and economy. Earthquake map reveals liquefaction risks in bay area. Mar 27, 2014 a 20 report from the san francisco public press found that there could be as many as 58,000 people living in housing units at major risk of collapse during a large earthquake. Jan 26, 2018 san francisco is exposed to seismic hazards from numerous known faults and potentially unmapped or undiscovered faults. Geologic map of the san francisco bay area graymer and others, 2006. At each location, the map predicts the approximate probability that shallow wet sands will liquefy and cause surface manifestations of liquefaction such as sand boils and ground cracking. Phase 2 will create a policy agenda report for earthquake risk reduction specific to the east bay. Air earthquake model for the united states the united states faces significant earthquake risk, both from crustal seismic sources throughout the country and from the cascadia subduction zone off the pacific northwest coast. Peter yanev, a san franciscobased structural engineer and the founder of eqe, a pioneer consulting firm in the field of seismic risk, has spent a lifetime visiting postearthquake disaster zones. Learn about earthquake hazards what do i need to know about earthquake hazards. It forms the tectonic boundary between the pacific plate and the north american plate, and its motion is rightlateral strikeslip horizontal. Move inland and head to higher ground during a tsunami.
Imperial, riverside, san bernard, inland southern california. For context, the 1989 loma prieta earthquake, with a magnitude of 6. Soil map data with san francisco bays national earthquake hazard reduction program was entered into hazusmh 2. The san andreas fault is a continental transform fault that extends roughly 1,200 kilometers 750 mi through california. San francisco, ca has a high earthquake risk, with a total of 3,484 earthquakes since 1931.
Several other capss reports are also available in the series, here todayhere tomorrow. Earthquake risk is high throughout the san francisco bay area but is not the. Sf72 san franciscos official preparedness webpage alertsf alertsf is a smsbased message service to let you know of alerts regarding emergencies disrupting vehicularpedestrian traffic, watches and warnings for tsunamis, flooding, and citywide postdisaster information to your registered wireless devices and email accounts california earthquake authority cea is a publicly. The consequences of a large earthquake would be staggering, as summarized below and described in detail in this report. If a major earthquake occurs in the desert of southeastern california. Recent changes in earthquake hazard science in california are transforming the way we think about managing earthquake risk. With inflation and exposure added, the total property loss if such an event occurred today could be well over 200 billion usdollars and the insured loss would range between 30 to 60 billion usdollars. In 1965, fedotov published a map showing where largemagnitude earthquakes should be expected,andhis predictions were. Re san francisco still has an earthquake problem news article, june 15, about the risk to high rises in the city. California department of conservation administers a variety of programs vital to californias public safety, environment and economy. San francisco bay area earthquake liquefaction zone map. Urban seismic hazards usgs earthquake hazard program. Pdf disaster management and mitigation for earthquakes. However, it is important to note that san francisco has already taken great strides to reduce its earthquake risk.
This activity is designed to provide a better understanding of earthquake activity, the locations of faults, and earthquake hazards in the san francisco bay area. Alameda, contra costa, marin, napa, san francisco, san mateo, santa clara, solano, sonoma. If you are in a coastal area and feel an earthquake with strong shaking lasting a minute or more, drop, cover, and hold on until the shaking stops, then move immediately to higher ground. In 1989 an earthquake near san francisco, california the loma prieta, or world series earthquake with a moment magnitude of 6. Affected coastal citiescommunities on each map are listed in parentheses. Earthquake risk in san francisco the new york times.
San francisco earthquake today 2015 strikes mill valley, bay area. Theres a 76% chance that the san francisco bay area could experience a devastating 7. According to the third uniform california earthquake rupture forecast ucerf3 report, in the next 30 years beginning in 2014, there is a more than 99% chance that one or more m6. Before you agree to buy a home, you should consider the following. The san andreas is most likely to produce the most damaging earthquake. San francisco earthquake of 1989 history, magnitude.
California central and eastern us pacific northwest california. Potential earthquake impacts atc521 report, which focuses on estimating impacts to the citys. Earthquakes this large are capable of causing widespread damage. 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. The geotechnical aspects practical lessons from the. Also, generalized fault data used in the hazard maps. Wgncep 96 as input to the california seismic hazard map petersen and others. The liquefaction hazard maps for the sf bay area, nw alameda county, and n santa clara valley predict the approximate percentage of each designated area that will have surface manifestations of liquefaction during an m7. The san francisco bay area is underlain by a complex web of active faults see map at right. Ap worried that an earthquake could collapse a big dam south of san francisco, officials have ordered its reservoir to be completely drained by october to reduce the risk of. Click on the image to download the pdf and get your sf liquefactionlandslide knowledge onquiz next week. San franciscos earthquake risk usgs fault maps, san francisco usgs liquefaction susceptibility, san francisco usgs, putting down roots in earthquake country usgs, bay area earthquake probability usgs, hayward fault information after the earthquake ssc, what to do immediately after calema, individual assistance.
Map modified from plafker, george and galloway, john p. The red on this map tells you that if you build near the river, or in a valley on unconsolidated sediment, you better make sure that you have engineered your house for earthquake stabiity. Port of san francisco waterfront plan createupdate 4 port of san francisco brad benson, director of special projects port lands were managed by the state of california until the state legislature approved the burton act in 1968, granting these lands to the city and county of san francisco and establishing the san francisco port commission. The activity utilizes a satellite image of the bay area on which earthquake epicenters from 1970 2003 have been plotted sleeter and others, 2004. This map shows the relative intensity of ground shaking and damage in the san francisco bay region from anticipated future eart hquakes. The california earthquake hazards zone application eq zapp is an onlin e map that allows anyone with a computer, tablet or smartphone to conveniently check whether a property is in an earthquake hazard zone.
Various output formats, and links to earthquake details. Most were killed when a double decked freeway in oakland collapsed. Available for download, these maps identify and map areas prone to earthquake hazards of liquefaction, earthquakeinduced landslides and amplified ground shaking. This collection of mitigation success stories demonstrates that effective earthquake risk reduction programs can be. Earthquake hazard map showing peak ground accelerations having a 2 percent probability of being exceeded in 50 years, for a firm rock site.
The coming bay area earthquake 2010 update of scenario for a magnitude 7. Have a certified home inspector, licensed building contractor, engineer, or architect inspect the home and give an opinion on existing earthquake risks and the estimated cost to strengthen the home. Because of the lack of instrumentation at the time, estimates must be based on written accounts of those who witnessed the quake or. Using gis for assessing earthquake hazards of san francisco bay, california, usa. Liquefaction hazard maps for san francisco bay area. Using gis for assessing earthquake hazards of san francisco. Earthquake evidence san francisco forum tripadvisor. Earthquake outlook for the san francisco bay region 20142043. Mar 20, 2011 nearly twothirds of those events were the result of distant sources 4. San francisco bay area earthquake, skyscraper risk business. San francisco s risk for a local source tsunami is low.
Seismic hazards maps and reports for the san francisco bay area. Earthquake risk prompts order to drain california dam. Other abag earthquake hazard maps show areas of liquefaction suscep. Saint marys university of minnesota central service press. In the san francisco bay, 51 tsunamis have been recorded since 1850 5. Liquefaction is a phenomenon that is caused by earthquake shaking. Oakl rid that a large number of employers are located in areas which. At the time of the earthquake, much of the bay area was sparsely populated. Nov 15, 2016 this post is part of a series sponsored by corelogic. In their zeal to restore their city, san franciscans downplayed the role of the earthquake and persisted in choosing patterns of development that exacerbated risk. The fault divides into three segments, each with different characteristics and a different degree of earthquake risk.
New online tool helps residents assess earthquake risk. All of san francisco is susceptible to very strong to severe shaking. The publication of the earthquake risk map is an ideal benchmark from which to measure how people respond to information. San francisco bay, hayward fault, san andreas fault, hazus, probability. Search earthquake catalog view historic seismicity, find past earthquakes that meet your criteria. The map is titled earthquakes and faults in the san francisco bay. This report is eerily familiar to those regarding warnings. For the 30th anniversary of the loma prieta earthquake the 6. Reid built on gilberts model to develop elastic rebound theory which remains the 608 earthquake hazard mitigation. Percent change in annual premium by county, 20002018 12 value of residences without earthquake coverage, 2018. San francisco earthquake of 1989, major earthquake that struck the san francisco bay area, california, u. The road to earthquake resilience in san francisco. San francisco neighborhoods prone to liquefaction and. Faults interactive fault map and comprehensive geologically based information on known or suspected active faults and folds in the united states.
If the city continues these efforts in the decades to come, the damage expected in future earthquakes will. Seismic hazard zones shz map is included in this ele ment, and shows the areas with potential liquefaction and earthquakeinduced landslides. Oct 04, 2018 dozens of downtown san francisco highrises should be inspected for previously undetected damage they might have sustained during the loma prieta earthquake nearly 30 years ago. The worst tsunami event in california occurred in 1964 as the result of a magnitude 9.
Click on the map images to viewdownload the detailed tsunami inundation maps or click on the alphabetized list of quadrangles at the bottom of the image. Liquefaction hazard maps usgs earthquake hazard program. Seismic hazard zones city and county of san francisco. Earthquake shaking potential for the san francisco bay region. Map of known active faults in the san francisco bay region. Today, the bay area population has increased tenfold to 7 million people, all at risk from expected earthquakes on one or more of the bay area faults.
Dyl examines the decades leading up to the catastrophic event and the citys recovery from it. The 1906 san francisco earthquake struck the coast of northern california at 5. Based on san francisco seismic hazard zones publishing to the public requires approval three types of geological hazards, referred to as seismic hazard zones, may be featured on the map. A hedonic analysis of the victoria real estate market by. Earthquake fault zones areas in yellow surrounding black lines, areas at risk of liquefaction green and and areas at risk of landslide aqua in the san francisco bay area. Putting down roots in earthquake country city of san mateo. Dozens of downtown san francisco highrises should be inspected for previously undetected damage they might have sustained during the loma prieta earthquake nearly 30. Bay area 30 year earthquake risk projection map of the month.
Maps of quaternary deposits and liquefaction susceptibility in the. In 1700, a megaquake occurred on the cascadia subduction zone just off the pacific northwest. Seismologists predict a major earthquake, similar in size to the 1906 quake, can hit the san francisco area at any time. The services doc provides are designed to balance todays needs with tomorrows obligations by fostering the wise use and conservation of energy, land and mineral resources. Geological survey and other scientists now conclude that there is a 63% probability of at least one magnitude 6. Apr 18, 2018 peter yanev, a san francisco based structural engineer and the founder of eqe, a pioneer consulting firm in the field of seismic risk, has spent a lifetime visiting post earthquake disaster zones. San francisco county earthquake hazard abag resilience program. The discussion about salience continues in section 5.
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