Ground-motion prediction from tremor

Geophysical Research Letters
By:  and 



The widespread occurrence of tremor, coupled with its frequency content and location, provides an exceptional opportunity to test and improve strong ground-motion attenuation relations for subduction zones. We characterize the amplitude of thousands of individual 5 min tremor events in Cascadia during three episodic tremor and slip events to constrain the distance decay of peak ground acceleration (PGA) and peak ground velocity (PGV). We determine the anelastic attenuation parameter for ground-motion prediction equations (GMPEs) to a distance of 150 km, which is sufficient to place important constraints on ground-motion decay. Tremor PGA and PGV show a distance decay that is similar to subduction-zone-specific GMPEs developed from both data and simulations; however, the massive amount of data present in the tremor observations should allow us to refine distance-amplitude attenuation relationships for use in hazard maps, and to search for regional variations and intrasubduction zone differences in ground-motion attenuation.

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Publication type Article
Publication Subtype Journal Article
Title Ground-motion prediction from tremor
Series title Geophysical Research Letters
DOI 10.1002/2013GL058506
Volume 40
Issue 24
Year Published 2013
Language English
Publisher Wiley
Contributing office(s) Earthquake Science Center
Description 6 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Geophysical Research Letters
First page 6340
Last page 6345
Country Canada;United States
State British Columbia;Oregon;Washington
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