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Rupture complexity of the M_w 8.3 Sea of Okhotsk Earthquake: Rapid triggering of complementary earthquakes?

Wei, Shengji and Helmberger, Don and Zhan, Zhongwen and Graves, Robert (2013) Rupture complexity of the M_w 8.3 Sea of Okhotsk Earthquake: Rapid triggering of complementary earthquakes? Geophysical Research Letters, 40 (19). pp. 5034-5039. ISSN 0094-8276. doi:10.1002/grl.50977.

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We derive a finite slip model for the 2013 M_w 8.3 Sea of Okhotsk Earthquake (Z = 610 km) by inverting calibrated teleseismic P waveforms. The inversion shows that the earthquake ruptured on a 10° dipping rectangular fault zone (140 km × 50 km) and evolved into a sequence of four large sub-events (E1–E4) with an average rupture speed of 4.0 km/s. The rupture process can be divided into two main stages. The first propagated south, rupturing sub-events E1, E2, and E4. The second stage (E3) originated near E2 with a delay of 12 s and ruptured northward, filling the slip gap between E1 and E2. This kinematic process produces an overall slip pattern similar to that observed in shallow swarms, except it occurs over a compressed time span of about 30 s and without many aftershocks, suggesting that sub-event triggering for deep events is significantly more efficient than for shallow events.

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Zhan, Zhongwen0000-0002-5586-2607
Additional Information:© 2013 American Geophysical Union. Received 16 August 2013; revised 17 September 2013; accepted 19 September 2013; published 3 October 2013. The teleseismic data were downloaded from IRIS, and figures are made with GMT. This research is supported by NSF grant EAR-1142020 and USGS award G10AP00048, Caltech Tectonics Observatory. The manuscript was improved by the constructive input of Ken Hudnut, Gavin Hayes, and two anonymous reviewers. The Editor thanks two anonymous reviewers for their assistance in evaluating this paper.
Group:Caltech Tectonics Observatory, Seismological Laboratory
Funding AgencyGrant Number
Caltech Tectonics ObservatoryUNSPECIFIED
Subject Keywords:finite fault; path calibration; triggering; rupture velocity; teleseismic; slab
Issue or Number:19
Record Number:CaltechAUTHORS:20131121-092052360
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Official Citation:Wei, S., D. Helmberger, Z. Zhan, and R. Graves (2013), Rupture complexity of the Mw 8.3 sea of okhotsk earthquake: Rapid triggering of complementary earthquakes?, Geophys. Res. Lett., 40, 5034–5039, doi:10.1002/grl.50977
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42608
Deposited By: Tony Diaz
Deposited On:21 Nov 2013 21:05
Last Modified:10 Nov 2021 16:25

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