Hazards

Seismic Hazard Maps and Data

Probabilistic and scenario ground-motion hazard maps, input and output data, and documentation. More…

• Lower 48
  Ground-motion hazard maps originally created in 1996 and updated in 2002 and 2008.
• Alaska
  Ground-motion hazard maps originally created in 1999 and updated in 2007.
• Hawaii
  Ground-motion hazard map (1998).
• Puerto Rico
  Ground motion hazard map (2003).
• Guam/Marianas
  Seismic Hazard Assessment for Guam and the Northern Mariana Islands.
• Samoa/Pacific Islands
  Seismic Hazard Assessment for Samoa/Pacific Islands.
• Urban & Regional
  Probabilistic and deterministic hazard maps for urban areas using local geologic site effects.
• Scenarios
  Expected ground motions and effects of specific hypothetical large earthquakes using Shakemap.
• Time-Dependent
  Ground-motion hazard maps assuming faults are less likely to rupture after recent large events.
• Foreign
  Probabilistic and deterministic ground motion hazard maps for SE Asia, Afghanistan, and Gujarat (India).

Seismic Design Maps, Data, and Tools for Engineers

Tools allowing users to determine ground motion values at a site for various design code reference documents. More…

Seismic Hazard Analysis Tools

Create customized hazard and probability maps with additional options to assess individual source-contributions to overall hazard. More…

• Create Custom Hazard Maps
  Replot local portions of national hazard maps. You define center and span.
• Interactive Hazard Maps
  On-line SA or PGA maps for 2% or 10% in 50 year PE for conterminous US with features you can turn on and off. Zoom in or pan out.
• Earthquake Probability
  Map and table of probability that an earthquake with magnitude > M and distance < R will occur in the next k years. Uses the 2009 or 2002 model. Centered on user-supplied location.
• Hazard Curve Application
  Displays hazard curves and uniform hazard response spectra, and provides details on programmatic access to USGS hazard data.
• Interactive Deaggregations
  Tables and plots of source contributions to hazard exceedance by magnitude, distance, ε and ε₀ in the conterminous US, Alaska, and Hawaii.
• Banded Deaggregations
  Tables of mean and modal magnitude and distance, and plot of contribution to hazard within specified ground-motion bands for conterminous US.
• Vs30
  Generates map and grid of Vs30 derived from topographic slope for anywhere in the world.