Deep low-frequency earthquakes in tremor localize to the plate interface in multiple subduction zones

Geophysical Research Letters
By: , and 

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Abstract

Deep tremor under Shikoku, Japan, consists primarily, and perhaps entirely, of swarms of low-frequency earthquakes (LFEs) that occur as shear slip on the plate interface. Although tremor is observed at other plate boundaries, the lack of cataloged low-frequency earthquakes has precluded a similar conclusion about tremor in those locales. We use a network autocorrelation approach to detect and locate LFEs within tremor recorded at three subduction zones characterized by different thermal structures and levels of interplate seismicity: southwest Japan, northern Cascadia, and Costa Rica. In each case we find that LFEs are the primary constituent of tremor and that they locate on the deep continuation of the plate boundary. This suggests that tremor in these regions shares a common mechanism and that temperature is not the primary control on such activity.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Deep low-frequency earthquakes in tremor localize to the plate interface in multiple subduction zones
Series title Geophysical Research Letters
DOI 10.1029/2009GL040027
Volume 36
Issue 19
Year Published 2009
Language English
Publisher American Geophysical Union
Contributing office(s) Earthquake Science Center
Description Article L19306; 5 p.