Teleseismic inversion for rupture process of the 27 February 2010 Chile (M_w 8.8) earthquake

Creators: Lay, T.; Ammon, C. J.; Kanamori, H.; Koper, K. D.; Sufri, O.; Hutko, A. R.

Abstract

The 27 February 2010 Chile (M_w 8.8) earthquake is the fifth largest earthquake to strike during the age of seismological instrumentation. The faulting geometry, slip distribution, seismic moment, and moment-rate function are estimated from broadband teleseismic P, SH, and Rayleigh wave signals. We explore some of the trade-offs in the rupture-process estimation due to model parameterizations, limited teleseismic sampling of seismic phase velocities, and uncertainty in fault geometry. The average slip over the ~81,500 km^2 rupture area is about 5 m, with slip concentrations down-dip, up-dip and southwest, and up-dip and north of the hypocenter. Relatively little slip occurred up-dip/offshore of the hypocenter. The average rupture velocity is ~2.0–2.5 km/s.

Additional Information

© 2010 by the American Geophysical Union. Received 25 March 2010; revised 21 May 2010; accepted 25 May 2010; published 1 July 2010. This work made use of GMT and SAC software. The IRIS DMS and the F‐Net and Hi‐net data centers were used to access the data. We thank Susan Beck, Göran Ekström, Ed Garnero, Gavin Hayes, Chen Ji, Sutacha Hongsresawat, Luis Rivera, and Seth Stein for information about their preliminary studies of this event. An anonymous reviewer provided helpful comments. This work was supported by NSF grant EAR0635570 and USGS award 05HQGR0174.

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