2 edition of Liquefaction hazards in the San Francisco Bay region found in the catalog.
Liquefaction hazards in the San Francisco Bay region
Jonathan W. Pease
by School of Civil and Enviromental Engineering, Cornell University in Ithaca, NY
Written in English
|Other titles||Site investigation, modeling, and hazard assessment in areas most seriously affected by the 1989 Loma Prieta earthquake|
|Statement||by J.W. Pease, T.D. O"Rourke.|
|Contributions||O"Rourke, T. D., Geological Survey (U.S.), Cornell University. School of Civil and Environmental Engineering.|
|The Physical Object|
|Pagination||xviii, 176 p. :|
|Number of Pages||176|
The data in this data release are comprised of one geospatial vector dataset and three tabular datasets related to the HayWired earthquake scenario, a magnitude earthquake hypothesized to occur on Ap , with an epicenter in the city of Oakland, CA. The geospatial vector data are a representation of identified economic subareas for use in selected analyses related to selected. We assessed geologic, topographic, seismic hazard, and subsurface conditions at about sites of past liquefaction in California. Among the parameters we found common to many of these sites are: (a) low elevations, (b) proximity to a water body, and (c) presence of geologically youthful deposits or artificial fill materials.
Safety First: Improving Hazard Resilience in the Bay Area, builds on our extensive work in earthquake and climate resilience and supports the SPUR Regional Strategy, a . On the afternoon of 17 October , a magnitude earthquake rocked the San Francisco Bay Area, killing 63 people and causing $13bn in damages as it toppled a chunk of the Bay Bridge, collapsed.
The highest hazard areas shown by the liquefaction hazard maps are concentrated in regions of man-made landfill, especially fill that was placed many decades ago in areas that were once tidal flats and submerged bay floor. Such areas along the Bay margins are found in San Francisco, Oakland and Alameda Island, as well as other places around the. The alignment of the proposed project is located near the eastern edge of the San Francisco Bay. The San Francisco Bay area is located within the Coast Range Geomorphic Province of California, a region shaped by complex and dynamic geologic processes.
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The highest hazard areas shown by the liquefaction hazard maps are concentrated in regions of man-made landfill, especially fill that was placed many decades ago in areas that were once submerged bay floor.
Such areas along the Bay margins are found in San Francisco, Oakland and Alameda Island, as well as other places around San Francisco Bay. Susceptibility is delineated in five units from “Very High” to “Very Low” hazard. Roughly one quarter of the San Francisco Bay region may be exposed to liquefaction—the area mapped in the “Very High”, “High” and “Moderate” categories makes up about 25% of the 9-county region.
Bay Area Metro Center Beale Street, Suite San Francisco, CA Phone: () Fax: () [email protected] Follow us on Twitter. In the South Bay and along the Peninsula, one massive liquefaction zone extends from SFO down through most of Santa Clara and San Jose.
Map users may search for. The REAL Dirt on Liquefaction: A Guide to the Liquefaction Hazard in Future Earthquakes Affecting the San Francisco Bay Area—Jeanne B.
Perkins, ABAG. Maps of Quaternary Deposits and Liquefaction Susceptibility in the Central San Francisco Bay Region, California, USGS Open-File Report —Witter et al. ForewordThe Great San Francisco earthquake (magnitude ) and the Loma Prieta earthquake (magnitude ) each motivated residents of the San Francisco Bay region to build countermeasures to earthquakes into the fabric of the region.
Since Loma Prieta, bay-region communities, governments, and utilities have invested tens of billions of. Areas marked in dark green show liquefaction zones (Fisherman’s Wharf in San Francisco and South of Market, for example). Areas marked in light blue indicate landslide-prone areas. This is a digital Seismic Hazard Zone Map presenting areas where liquefaction and landslides may occur during a strong earthquake.
Three types of geological hazards, referred to as seismic hazard zones, may be featured on the map: 1) liquefaction, 2) earthquake-induced landslides, and 3) overlapping liquefaction and earthquake-induced landslides. Liquefaction can turn loosely packed, water-saturated soil to liquid and undermines home support structures.
San Francisco and neighboring cities pose a high risk for liquefaction and landslides. In AprilCalifornia Department of Conservation updated their liquefaction hazard map for the San Francisco Bay Area.
Data for all Bay Area counties except for San Francisco were obtained March 16th, by ABAG. more info. Flood – & year The shapefile maps flooding layers (year and year floodplain) for the 9 county Bay Area region (County of San Francisco is missing).
This should not be used for flood insurance purposes, but rather hazard. liquefaction hazard mapping in part of the San Francisco Bay area in California. LPI, which LPI, which predicts the liquefaction perform ance of the soil profile at a specific site to a depth of 20 m.
This report presents a map and database of Quaternary deposits and liquefaction susceptibility for the urban core of the San Francisco Bay region. It supercedes the equivalent area of U.S. Geological Survey Open-File Report (Knudsen and others, ), which covers the larger 9-county San Francisco Bay region.
liquefaction hazard mapping in part of the San Francisco Bay area in California. LPI, which predicts the liquefaction performance of the soil profile at a specific site to a depth of 20 m.
Some of the highest hazard areas for liquefaction are areas in which fill dirt was used to create a human-made landfill in areas that were once submerged bay floors.
Therefore, many of the areas along the Bay margins in San Francisco and other areas around San Francisco Bay may be at high risk for liquefaction in a major earthquake ( or. The first event close to an urban environment and studied in detail, was the San Francisco earthquake while the last decade, severe structural damages were induced due to soil liquefaction (CES –, Great East JapanEmilia.
Figure 2. Map of the San Francisco Bay region, California, showing liquefaction (soils becoming liquid-like during shaking) probabilities for western Alameda and northern Santa Clara Counties as a result of strong ground shaking during the hypothetical magnitude-7 mainshock of the HayWired earthquake scenario on the Hayward Fault., greater than.
The USGS says about 25 percent of the nine-county Bay Area region are rated "Very High," "High" and "Moderate" for liquefaction susceptibility with square miles falling in. (through avoidance, engineering, planning and response) the liquefaction hazard in the San Francisco Bay Area.
As such, the audience is not the geology or engineering community, but rather those who work for and with the local governments, utilities, businesses, and residents in our region.
Liquefaction hazard maps were prepared for Alameda, Oakland, and Piedmont, California, using the liquefaction potential index (LPI) to assess the liquefaction hazard of surficial geologic units.
LPI values were computed from cone penetration test. Areas of San Francisco at risk of liquefaction during an earthquake.
Traced from a PDF file; please let me know about any errors. State of California Seismic Hazard Zones, City and County of San. Recommended actions for Liquefaction Seismic Hazard zones. San Francisco Bay Region Geology and Geologic Hazards Evaluating and Mitigating Seismic Hazards - see Chapter 5 Recommended actions for Earthquake-Induced Landslide zones.
Evaluating and Mitigating Seismic Hazards - .Because fault stresses were reduced, the rate of large quakes in the San Francisco Bay region dropped abruptly after the earthquake. The three-quarters of a century following the quake was a golden age for the bay region, in which urban areas and population expanded rapidly during a time of minimal quake activity.San Francisco, California () Seismic Hazard Zone Reports (SHZR) summarize the development of the hazard zone map for each area and contain background documentation for use by site investigators and local government reviewers.
These reports are available for reference at CGS offices in Sacramento, San Francisco, and Los Angeles.