Urban Seismic Hazards

California

  •  Liquefaction Hazard in Oakland, CA

    The liquefaction hazard map predicts 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). This event dominates the deaggregated hazard near the eastern shore of San Francisco Bay.
  •  Soil Type and Shaking Hazard in the S.F. Bay Area

    The type of soil at a site affects the intensity of shaking there. Learn about this effect and use interactive maps to look up the soil type at any site in the San Francisco Bay Area.
  •  Liquefaction Susceptibility Map for San Francisco Bay Region

    Shows the distribution of rock and sediment having different vulnerabilities to liquefaction when shaken by earthquakes, together with explanation of the process and examples of its effects.
  • Regional Earthquake Likelihood Model

    A Southern california Earthquake Center (SCEC) collaborative study to test and analyze different types of earthquake-rupture forecasts.
  •  San Francisco Bay Area Hazard Maps

    Association of Bay Area Governments offers shaking maps, liquefaction maps, predictive transportation disruption maps, and more.
  •  California Seismic Hazard Maps

    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

  •  Memphis, Shelby County Seismic Hazard Maps

    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.
  •  Reducing Hazards in the Central and Eastern U.S.

    These webpages are focused on earthquake risk and hazards in this area of the country.
  •  Evansville Area Earthquake Hazards Mapping Project

    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 Project

    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.
  •  Lifelines and earthquake hazards in the greater Seattle area

    A Pacific Northwest Urban Corridor Geologic Mapping Project of the Western Earth Surface Processes Team
  •  Pacific Northwest Urban Mapping & Geologic Hazards

    The urban corridor lies within the Puget-Willamtte lowland, a seismically active forearc basin overlying the Cascadia subduction zone - Pacific Northwest Urban Corridor Geologic Mapping Project of the Western Earth Surface Processes Team