Very low frequency earthquakes in Cascadia migrate with tremor

DOI Web Site Web Site 被引用文献23件 参考文献19件
  • Abhijit Ghosh
    Department of Earth Sciences University of California Riverside California USA
  • Eduardo Huesca‐Pérez
    Department of Earth Sciences University of California Riverside California USA
  • Emily Brodsky
    Department of Earth and Planetary Sciences University of California Santa Cruz California USA
  • Yoshihiro Ito
    Disaster Prevention Research Institute Kyoto University Kyoto Japan

書誌事項

公開日
2015-05-07
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2015gl063286
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>We find very low frequency earthquakes (VLFEs) in Cascadia under northern Washington during 2011 episodic tremor and slip event. VLFEs are rich in low‐frequency energy (20–50 s) and depleted in higher frequencies (higher than 1 Hz) compared to local earthquakes. Based on a grid search centroid moment tensor inversion, we find that VLFEs are located near the plate interface in the zone where tremor and slow slip are observed. In addition, they migrate along strike with tremor activity. Their moment tensor solutions show double‐couple sources with shallow thrust mechanisms, consistent with shear slip at the plate interface. Their magnitude ranges between <jats:italic>Mw</jats:italic> 3.3 and 3.7. Seismic moment released by a single VLFE is comparable to the total cumulative moment released by tremor activity during an entire episodic tremor and slip event. The VLFEs contribute more seismic moment to this episodic tremor and slip event than cumulative tremor activity and indicate a higher seismic efficiency of slow earthquakes in Cascadia than previously thought. Spatiotemporal correlation of VLFE and tremor activity suggests that they are the results of the same physical processes governing slow earthquakes.</jats:p>

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