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Frequency‐dependent energy radiation and fault coupling for the 2010 Mw8.8 Maule, Chile, and 2011 Mw9.0 Tohoku, Japan, earthquakes

Frequency‐dependent energy radiation and fault coupling for the 2010 Mw8.8 Maule, Chile, and 2011... We carried out back‐projections of teleseismic data filtered in different frequency bands for the 2010 Maule, Chile and the 2011 Tohoku, Japan earthquakes. For the Maule earthquake, there were differences along strike of the fault, with the high‐frequency energy mainly originating from an area 200 km northeast of the epicenter, whereas low‐frequency energy came from a location closer to the epicenter. The Tohoku earthquake shows strong frequency dependence in the dip direction. High‐frequency sources were located about 100 km west of the epicenter, while low‐frequency sources were around epicenter, near the Japan Trench. We compare the spatial distributions of energy with estimates of seismic coupling before the earthquakes. Areas of high‐frequency radiation seem correlated with regions that were strongly coupled before the earthquakes. Areas of high coupling, may be associated with fault properties that are more heterogeneous and/or have overall higher stress, producing higher frequency seismic waves. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Frequency‐dependent energy radiation and fault coupling for the 2010 Mw8.8 Maule, Chile, and 2011 Mw9.0 Tohoku, Japan, earthquakes

Wang, Dun; Mori, Jim
Geophysical Research Letters , Volume 38 (22) – Nov 1, 2011
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Publisher
Wiley
Copyright
Copyright © 2011 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0094-8276
eISSN
1944-8007
DOI
10.1029/2011GL049652
Publisher site
See Article on Publisher Site

Abstract

We carried out back‐projections of teleseismic data filtered in different frequency bands for the 2010 Maule, Chile and the 2011 Tohoku, Japan earthquakes. For the Maule earthquake, there were differences along strike of the fault, with the high‐frequency energy mainly originating from an area 200 km northeast of the epicenter, whereas low‐frequency energy came from a location closer to the epicenter. The Tohoku earthquake shows strong frequency dependence in the dip direction. High‐frequency sources were located about 100 km west of the epicenter, while low‐frequency sources were around epicenter, near the Japan Trench. We compare the spatial distributions of energy with estimates of seismic coupling before the earthquakes. Areas of high‐frequency radiation seem correlated with regions that were strongly coupled before the earthquakes. Areas of high coupling, may be associated with fault properties that are more heterogeneous and/or have overall higher stress, producing higher frequency seismic waves.

Journal

Geophysical Research Letters – Wiley

Published: Nov 1, 2011

Keywords: ; ; ; ; ;

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