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"Did you feel it?" Intensity data: A surgprisingly good measure of earthquake ground motion

Seismological Research Letters

By:
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DOI: 10.1785/gssrl.78.3.362

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Abstract

The U.S. Geological Survey is tapping a vast new source of engineering seismology data through its "Did You Feel It?" (DYFI) program, which collects online citizen responses to earthquakes. To date, more than 750,000 responses have been compiled in the United States alone. The DYFI data make up in quantity what they may lack in scientific quality and offer the potential to resolve longstanding issues in earthquake ground-motion science. Such issues have been difficult to address due to the paucity of instrumental ground-motion data in regions of low seismicity. In particular, DYFI data provide strong evidence that earthquake stress drops, which control the strength of high-frequency ground shaking, are higher in the central and eastern United States (CEUS) than in California. Higher earthquake stress drops, coupled with lower attenuation of shaking with distance, result in stronger overall shaking over a wider area and thus more potential damage for CEUS earthquakes in comparison to those of equal magnitude in California - a fact also definitively captured with these new DYFI data and maps.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
"Did you feel it?" Intensity data: A surgprisingly good measure of earthquake ground motion
Series title:
Seismological Research Letters
DOI:
10.1785/gssrl.78.3.362
Volume
78
Issue:
3
Year Published:
2007
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Seismological Research Letters
First page:
362
Last page:
368
Number of Pages:
7