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Diagnosing Source Geometrical Complexity of Large Earthquakes

Rivera, L. and Kanamori, H. (2014) Diagnosing Source Geometrical Complexity of Large Earthquakes. Pure and Applied Geophysics, 171 (10). pp. 2819-2840. ISSN 0033-4553. doi:10.1007/s00024-013-0769-4.

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We investigated the possible frequency dependence of the moment tensor of large earthquakes by performing W phase inversions using teleseismic data and equally-spaced narrow, overlapping frequency bands. We investigated frequencies from 0.6 to 3.8 mHz. Our focus was on the variation with frequency of the scalar moment, the amount of non-double-couple, and the focal mechanism. We applied this technique to 30 major events in the period 1994–2013 and used the results to detect source complexity. Based on the results, we classed them into three groups according to the variability of the source parameters with frequency: simple, complex and intermediate. Twelve of these events fell into the simple category: Bolivia-1994, Kuril-1994, Sanriku-1994, Antofagasta-1995, Andreanoff-1996, Peru-2001, Sumatra-2004, Sumatra-2005, Tonga-2006, Sumatra-2007, Japan-2011, and the recent Sea of Okhotsk-2013. Seven exhibited significant complexity: Balleny-1998, Sumatra-2000, Indian Ocean-2000, Macquarie Island-2004, Sichuan-2008, and Samoa-2009. The remaining 11 events showed a moderate degree of complexity. Here, we discuss the results of this study in light of independent observations of source complexity, made by various investigators.

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Rivera, L.0000-0002-0726-5445
Kanamori, H.0000-0001-8219-9428
Additional Information:© 2014 Springer Basel. Received June 25, 2013, revised December 24, 2013, accepted December 28, 2013, Published online January 31, 2014. This work uses seismic time series from the Federation of Digital Seismic Network (FDSN) retrieved through the Incorporated Research Institutions for Seismology (IRIS) Data Management System (DMS) and from Geoscope. We acknowledge two anonymous reviewers for their comments that helped to improve the original manuscript. L.R. was partially supported by the Caltech Seismological Laboratory and by the Tectonic Observatory.
Group:Caltech Tectonics Observatory, Seismological Laboratory
Funding AgencyGrant Number
Caltech Seismological LaboratoryUNSPECIFIED
Caltech Tectonics ObservatoryUNSPECIFIED
Issue or Number:10
Record Number:CaltechAUTHORS:20141218-081401776
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Official Citation:Rivera, L. & Kanamori, H. Pure Appl. Geophys. (2014) 171: 2819. doi:10.1007/s00024-013-0769-4
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52999
Deposited By: Tony Diaz
Deposited On:18 Dec 2014 16:54
Last Modified:10 Nov 2021 19:46

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