Urban Seismic Hazards

Science Center Objects

  

California

  • Liquefaction Hazard Maps for San Francisco Bay Area

    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 M7.1 earthquake on the Hayward fault. An earthquake of this magnitude is expected if the whole Hayward fault ruptures in a single event (Working Group on California Earthquake Probabilities, 1999).

  • Hazard Maps for San Francisco Bay Area

    Association of Bay Area Governments offers shaking maps, liquefaction maps, predictive transportation disruption maps, and more.

  • Seismic Hazard Maps for California

    In 1880 the California Legistlature established the State Mining Bureau which has evolved during its 127 years of continuous service into the modern California Geological Survey (CGS).

Central and Eastern US

  • Central U.S. Seismic Velocity Model

    The model covers a region of approximately 650,000 km2 and includes several urban areas, such as Little Rock, AR; Evansville, IN; Memphis, TN; Nashville, TN; Louisville, KY; and St. Louis, MO.

  • Central and Eastern U.S. Hazard and Seismicity Map

    This map shows earthquakes (circles) greater than magnitude 3.0 since 1974 plotted on the 2014 USGS National Seismic Hazard Map for the central and eastern United States. Warmer colors on this map indicate areas of higher hazard. Larger earthquakes are represented by larger circles. (PDF)

  • Memphis, Shelby County Earthquake Hazards Mapping

    Memphis, Shelby County, Tennessee, is located where damaging earthquakes are only moderately likely, but the consequences of earthquakes, mainly from the New Madrid seismic zone, can be very high. This densely populated urban area is built on a 1-kilometer-thick sequence of sediments deposited in a trough known as the Mississippi embayment. This thick pile of sediments significantly affects earthquake ground motions. We, the authors, have generated a suite of seismic hazard maps for a six-quadrangle area in Memphis, Shelby County, Tennessee, that accounts for these effects. These maps and their derivative products represent the collaborative efforts of the U.S. Geological Survey (USGS) and its partners.

  • Evansville Area Earthquake Hazards Mapping

    In tri-state Evansville area of Indiana, Kentucky, and Illinois the USGS is partnering with a local working group to produce urban earthquake hazard maps for the community.

  • St. Louis Area Earthquake Hazards Mapping

    In the St. Louis area of Missouri and Illinois the USGS is partnering with a local working group to produce urban earthquake hazard maps for the community.

Pacific Northwest

  • Seattle Urban Seismic Hazard Maps

    The USGS has produced a new series of earthquake hazard maps for the City of Seattle. These “urban seismic hazard” maps provide a much higher-resolution view of the potential for strong earthquake shaking than previously available. This new view is particularly important for Seattle, which sits atop a sedimentary basin that strongly affects the patterns of earthquake ground shaking and therefore, of potential damage.