Seismic Hazard Zone Map

The seismic threat across the country are depicted on maps in building codes as zones of different risk levels. Three types of geological hazards, referred to as seismic hazard zones, may be featured on the map: Click the ground response button.

The seismic hazards mapping act mandating the regulatory maps was passed the year after loma prieta. The map is based on the most recent usgs models for the conterminous u.s. The seismic hazard map layer indicates the relative seismic hazard across canada.

Maps of spectral (sa (t), where t is the period in seconds) and peak ground acceleration (pga) values are given in units of g (9.81 m/s 2 ).

Also, for the 2009 nehrp recommended seismic provisions, the 2010 asce/sei 7 standard, and the 2012 international building code: These hazard maps for seattle depict the hazard for ground shaking at frequencies of about 1 cycle per second. Geological survey that show earthquake data of individual states or groups of states at the scale of 1:1,000,000. The calculation is based on the latest available information from seismic hazard data.