Recommended actions for Earthquake Fault zones. Seismic hazards related to earthquakes, including ground ru pture/fault ing , liquefaction , strong motion, and tsunami. A main motivation for the studies of the 1989 liquefaction case histories, has been to calibrate as well as possible the Many of the region’s utilities and lifeline owners have made use of an earlier version of these maps in vulnerability assessments of their systems. The Port of Oakland is especially vulnerable to earthquake damage due to its proximity to the Hayward Fault and San Andreas Fault, which caused the destructive, magnitude 6.9 Loma Prieta earthquake during the 1989 World Series that featured the A's. Most residents of the Bay Area live and work in these low-lying areas that are underlain by these young deposits. This map shows the liquefaction hazard in the communities of Alameda, Berkeley, Emeryville, Oakland, and Piedmont for a magnitude 7.1 earthquake on the Hayward fault. A previous USGS map, published in 2000, covers a larger region (outlined in black). Twenty-two of the completed maps cover parts of San Francisco, Santa Clara, San Mateo, and Alameda counties; these maps are compiled into one map inside this CGS Note. Additionally, the Port of Oakland is identified as a liquefaction hazard zone where If I recall correctly, you live on Bair Island on a development that's built on infill, similar to Redwood Shores and Foster City. These new maps cover the San Francisco Bay region (outlined in red). When the ground liquefies, it may lose its ability to support buildings and other structures. The hazard map of the city indicates that 11%, 41% and 74% of Zone 1, Zone 2 and Zone 3, respectively, will show surface manifestation of liquefaction. Other potentially hazardous areas include those along some of the larger streams, which produce the loose young soils that are particularly susceptible to liquefaction. Soft muds on which it was constructed shook much more strongly than surrounding regions on stronger ground. If the property is not developed, a fault study may be required before the parcel can be subdivided or structures permitted. Such areas along the Bay margins are found in San Francisco, Oakland and Alameda Island, as well as other places around San Francisco Bay. CGS will continue producing seismic zonation maps for liquefaction and earthquake-induced landslides in the Bay region. ~ 7 MB. All of these sites present deposits of cohesionless hydraulic … You can check for yourself with EQ Zapp. I was just wondering if living in a high risk liquefaction zone is just a "risk" to deal with, or just straight outright stupidity. The maps also contribute to the California Geological Survey’s Seismic Hazard Zone maps. The first is a new map of the young geologic deposits in the low-lying sections of the Bay Area. The highest hazard areas are concentrated in regions of man-made landfill, especially fill that was placed many decades ago in areas that were once submerged bay floor. Oakland West Quadrangle Zone Map Author: CGS Staff Subject: Seismic Hazard Zones Keywords: liquefaction,landslide, earthquakes, seismic hazards, zone maps, Oakland, Alameda, Berkeley, San Francisco, Alameda County Created Date: 2/13/2003 5:16:53 PM Such areas along the Bay margins are found in San Francisco, Oakland and Alameda Island, as well as other places around San Francisco Bay. File Results. Landslides of all kinds, including seismically-triggered landslides, debris flows, mud flows, and rock falls. shzr_081_oakland_west.pdf. A pioneer in hazard mitigation and adaptation planning for the Bay Area, ABAG’s Resilience Program assists Bay Area local governments and residents in planning for earthquakes, the effects of climate change and other hazards. October 2005; DOI: 10.1061/40783(162)23 5.4 Liquefaction Potential 18 5.4.1 General 18 5.4.2 Preliminary Liquefaction Analysis 19 5.4.3 Low Liquefaction Potential 19 . Liquefaction is a phenomenon where saturated sand and silt take on the characteristics of a liquid during the intense shaking of an earthquake. The proposed Oakland A’s Howard Terminal ballpark and condominium site at the Port of Oakland suffered an “appreciable” liquefaction event, or land sinking, equaling a maximum of 11.8 inches during the 1989 Loma Prieta earthquake, according to a U.S. Geological Survey (USGS) report. Northern Santa Clara Valley This map shows the likelihood of liquefaction in Northern Santa Clara County during a magnitude 7.8 earthquake on the northernmost segments of the San Andreas Fault. No data point selected. The second of the maps shows the likelihood that these young deposits will liquefy, or turn into a sandy liquid due to the strong shaking a big earthquake will produce. This Open-File Report is a digital database for hazard maps of liquefaction effects and shaking amplification in the Oakland, California, area. Other potentially hazardous areas … These maps are designed to give the general public as well as land-use planners, utilities and lifeline owners, and emergency response officials, new and better tools to assess their risk from earthquake damage. One large liquefaction zone extends in the South Bay Peninsula from SFO down through Santa Clara and … Tsunami evacuation zones. Many of these hazards stem from the region’s mediterranean climate and location in an active fault zone. If you were 60 miles east, like Merced county, I would not be as concerned, unless your GWT is shallow. Staff geologists in the Seismic Hazard Mapping Program gather existing geological, geophysical and geotechnical data from numerous sources to compile the Seismic Hazard Oakland, CA is in zone 4 and is susceptible to strong ground motions. The median area of the overlaps in the statewide dataset is approximately 1.7 square meters. LQLS_OVERLAP_ZONE… Liquefaction vulnerability study Liquefaction vulnerability study T&T Ref. West Oakland, West Berkeley and Emeryville also face risks. This map shows the likelihood of liquefaction in Northern Santa Clara County during a magnitude 7.8 earthquake on the northernmost segments of the San Andreas Fault. Detailed mapping is needed to forecast where shaking will be strongest during future earthquakes. We can expect history to repeat itself in the next big Bay Area earthquake. This vulnerability to liquefaction of artificial fills in and around San Francisco is a great cause of concern for future earthquakes. The zone starts at San Francisco's Marina District, goes along the Embarcadero and extends to the Airport and parts of Millbrae and Foster City. In … Significant damage was observed in sites from the Oakland International Airport to the Port of Richmond, which are at distances of between 65 to 85Km from the northern end of the fault rupture. Click on a pin on the map to see more information. The residential Red Zone is land identified by the Government as unsuitable for occupation at the present time. Like the difference between driving a car, and then driving that car 100 mph. Take liquefaction very serious and do not assume structural performance is similar to past behavior. Topological checks performed indicate that there are occurrences of small overlaps and gaps between the zones along the 7.5 topo quad boundary which have not been corrected. Liquefaction damage was particularly severe on the Moss Landing sand spit, a 500- to 1,000-ft-wide shoreline peninsula deposited by beach sedimentation and by the Old Salinas River. The Loma Prieta earthquake caused extensive soil liquefaction in unimproved artificial fill deposits along the eastern shoreline areas of San Francisco Bay. Geotechnical Desk Study South Auckland Rural Urban Boundary Project Job no. LIQUEFACTION_ZONE: Geometry validation was performed and some digitizing artifacts such as kickbacks or kinks were deleted. Soft muds shake much harder than bedrock. In addition, the California Geological Survey has zoned the greater San Francisco area for liquefaction hazard in their seismic hazard maps. Bay mud remains a seismic hazard because on the basis of its past performance in earthquakes it will produce stronger levels of shaking than other geologic units. A tsunami is a series of powerful waves caused by large, sudden disturbances of the ocean floor. Select. liquefaction. Northern San Francisco and the Marin peninsula are not included in the new maps because geologic field mapping in these regions is incomplete. The risk levels are based on a magnitude of 5.5 or larger earthquake. It is important to map these deposits because so much of our infrastructure resides on them, and because they may host liquefaction, the phenomenon of saturated soils losing their stiffness and strength during shaking. Yellow evacuation zone: Covers the largest area that would need to be evacuated in the event of a maximum-impact tsunami. Figure on left shows that the shaking experienced in a region depends very strongly on the type of deposits found near the surface. This map shows the liquefaction hazard in the communities of Alameda, Berkeley, Emeryville, Oakland, and Piedmont for a magnitude 7.1 earthquake on the Hayward fault. Mineral hazards such as asbestos, radon, and mercury. Outside of San Francisco, Alameda, San Leandro and Hayward rest within a liquefaction zone. 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. Wet sand can become liquid-like when strongly shaken. These new maps show a lower likelihood of liquefaction than previously thought in regions underlain by Bay mud that fringes many parts of San Francisco Bay. This accompanying pamphlet serves to introduce and describe the digital data. Geographic Names Information System (GNIS), Mapping, Remote Sensing, and Geospatial Data. Make sure you know where to go, whether you are at home, at work or out and about. Other potentially hazardous areas include those along … Paper maps are not included in the Open-File Report; instead PDF plot files are included that can be used to plot images of the hazard maps. Such areas along the Bay margins are found in San Francisco, Oakland and Alameda Island, as well as other places around San Francisco Bay. These maps are the result of over a decade of work and collaboration between geologists from the consulting firm William Lettis & Associates, the U.S. Geological Survey, and the California Geological Survey. Union City's liquefaction danger zone extends roughly from the city's eastern boundary near Quarry Lakes Regional Recreation Center northeast to Whipple Drive … These maps are designed to give the general public as well as land-use planners, utilities and lifeline owners, and emergency response officials, new and better tools to assess their risk from earthquake damage. Orange evacuation zone: May need to be evacuated if there was a threat from a medium- to large-scale tsunami. Some of the young deposits strongly affect the strength of earthquake shaking that is transmitted through the deposits. Generally sparse but locally abundant ground effects include sand boils up to 2m (6ft) in diameter, ground fissures up to several tenths of a meter wide, some fences and roadways noticeably offset, sporadic ground settlements as much as 0.3m (1 ft), and slumps with 0.3 m (1 ft) of displacements common along steep stream banks. These maps show zones of liquefaction and earth-quake-induced landslides. Search for a File to Request. Request File. Liquefaction zones are shown in green. Your local Civil Defence Group has tsunami evacuation zone maps and regional advice. This area of potential liquefaction was delineated as being near a former creek that was buried during the development in this part of Oakland. Berkeley-Oakland shorelines (Holzer, 1998). Scientists predict that climate change will exacerbate the effects of natural hazards, amplifying concerns for human health and safety, ecosystem resilience, and economic stability. Please use the older map for areas not covered by the new map. File Name. The new maps show in unprecedented detail the nature of the materials that underlie areas of densest urban development and highlight areas that may be prone to shaking-related damage during future earthquakes. The eastern edge of the site is mapped within a liquefaction hazard zone, as designated by the California Geological Survey (State of California Seismic Hazard Zones, Oakland West Quadrangle, 2003 (Figure 3). Namely, Zone I means that liquefaction will occur, Zone II represents a high possibility of liquefaction, Zone III represents a low possibility of liquefaction, and Zone IV means that liquefaction will not occur. Landslide-prone areas are in light blue. Liquefaction mitigation measures include subsurface soil improvement, deep foundations, structural slabs, and soil cover. The older map also shows locations of liquefaction observed in historical earthquakes, particularly the Great 1906 earthquake and the 1989 Loma Prieta quake. The liquefied sand may flow and the ground may move and crack, causing damage to surface structures and underground utilities. File Size. Detail map of the seismic … Pipe Pile Stone Columns at Webster Street Tube, Oakland, California. Site improvement methods to address potential liquefaction include dynamic compaction, compaction grouting, jet grouting, and vibroflotation can [sic] significantly reduce the risk of liquefaction. Liquefaction during large earthquakes commonly disrupts pipelines and road networks and also may cause buildings to settle and move downslope or toward stream banks. 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. 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