Empirical Green function deconvolution of broadband surface waves: rupture directivity of the 1992 Landers, California (Mw = 7.3), earthquake

A. A. Velasco, C. J. Ammon, T. Lay

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

The paper presents a simple method to determine gross temporal and spatial characteristics of faulting that can uniquely define the fault plane for a relatively large earthquake. The technique involves deconvolution of teleseismic and regional broadband surface waves (and/or body waves) of a small event (an empirical Green function) from the corresponding signals at the same stations for a large mainshock. The procedure is applied to the 28 June 1992 Landers, California (Mw = 7.3), earthquake. The Landers earthquake source duration lasted about 25 sec, and was dominated by two subevents with predominantly north-northwestward rupture extending 60 to 70 km. The subevents show counterclockwise rotations of at least 12° in strike that correlate well with mapped surface rupture. -from Authors

Original languageEnglish (US)
Pages (from-to)735-750
Number of pages16
JournalBulletin - Seismological Society of America
Volume84
Issue number3
StatePublished - Jan 1 1994

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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