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Influence of Lithostatic Stress on Earthquake Stress Drops in North America



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Boyd, O.S., McNamara, D.E., Hartzell, Stephen, and Choy, George, 2017, Influence of Lithostatic Stress on Earthquake Stress Drops in North America: U.S. Geological Survey data release,


Earthquake stress drop is a critical parameter for estimating seismic hazard. This parameter can have a strong effect on ground motion amplitudes above ~1Hz and is especially important in Oklahoma and Kansas where earthquake rates have increased sharply since 2008. We estimate stress drops for 1121 earthquakes greater than ~M3 in and near the conterminous United States using spectral ratios between collocated events at given stations. We find that the average stress drop for the few eastern United States (EUS, 26–340 Bars) tectonic main shocks studied, which tend to be deeper thrusting events with few foreshocks and aftershocks, is about three times greater than tectonic main shocks in the western United States (WUS, 10–77 Bars), which [...]


Point of Contact :
Oliver S Boyd
Originator :
Oliver S Boyd, Daniel E McNamara, Stephen Hartzell, George Choy
Metadata Contact :
GHSC Data Steward
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
USGS Mission Area :
Natural Hazards
SDC Data Owner :
Earthquake Hazards Program

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TableS1.csv 250.17 KB
Original FGDC Metadata

8.03 KB


Analysis to support seismic hazard assessment.

Additional Information


Type Scheme Key
DOI doi:10.5066/F7TB1539

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