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U.S. Geological Survey
Open-File Report 01-164
Online version 1.0

Earthquake Ground-Motion Amplification in Southern California


Edward H. Field


thumbnail image of map

The two most important factors influencing the level of earthquake ground motion at a site are the magnitude and distance of the earthquake. The map available here shows the influence of a third important factor, the site effect: conditions at a particular location can increase (amplify) or decrease the level of shaking that is otherwise expected for a given magnitude and distance. Combining information about site effects with where and how often earthquakes of various magnitudes are likely to occur should provide improved assessments of seismic hazard.

Download this map as a PDF document (288 KB)
(note: this map measures 37 x 31 inches, and can be viewed with Acrobat Reader)

Download this map as an encapsulated PostScript file (14.7 MB)

For questions about the content of this report, contact author Ned Field

Find out more about earthquake shaking by reading a fact sheet entitled "Earthquake Shaking—Finding the Hot Spots"

Download a copy of Acrobat Reader for free

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Maintained by: Michael Diggles
Created: June 11, 2001
Last modified: December 20, 2007 (mfd)

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