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

Brown, J. R., Beroza, G. C., Ide, S., Ohta, K., Shelly, D. R., Schwartz, S. Y., Rabbel, Wolfgang, Thorwart, Martin and Kao, H. (2009) Deep low-frequency earthquakes in tremor localize to the plate interface in multiple subduction zones Geophysical Research Letters, 36 .

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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. Citation: Brown, J.R., G. C. Beroza, S. Ide, K. Ohta, D. R. Shelly, S. Y. Schwartz, W. Rabbel, M. Thorwart, and H. Kao (2009), Deep low-frequency earthquakes in tremor localize to the plate interface in multiple subduction zones, Geophys. Res. Lett., 36, L19306, doi:10.1029/2009GL040027.

Document Type: Article
Keywords: southwest japanepisodic tremor costa-rica p-wave cascadia slip segmentation tomography shikoku margin
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
ISSN: 0094-8276
Projects: Future Ocean
Date Deposited: 11 Feb 2011 12:15
Last Modified: 27 Jan 2012 05:33
URI: http://eprints.uni-kiel.de/id/eprint/9318

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