A search for seismic radiation from late slip for the December 26, 2004 Sumatra-Andaman (Mw = 9.15) earthquake

Aaron A. Velasco, Charles J. Ammon, Thorne Lay

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The great 2004 Sumatra-Andaman (Mw = 9.15) earthquake ruptured a 1300-km-long segment of the Sumatra-Andaman Islands subduction zone in about nine minutes. The possibility of continued fault slip after the primary rupture has been raised by tsunami excitation models and by discrepancies between seismic slip models and geodetic observations. We examine the global seismic wavefield to identify any late seismic radiation that occurred during the first hour after the main rupture using stacking of deconvolutions and cross correlations of complete ground motion observations and point-source responses (Green's functions). We find no evidence for delayed seismic radiation larger than Mw = 7.5. Any major slip within an hour after the main sliding with mechanism similar to the main shock involved deformation so slow that it radiated no detectable seismic waves in the body wave or surface wave passband for periods less than ∼500 s.

Original languageEnglish (US)
Article numberL18305
JournalGeophysical Research Letters
Volume33
Issue number18
DOIs
StatePublished - Sep 28 2006

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rupture
slip
earthquakes
earthquake
body wave
fault slip
Green function
radiation
deconvolution
stacking
tsunami
seismic wave
surface wave
ground motion
subduction zone
sliding
point source
seismic waves
cross correlation
point sources

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

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A search for seismic radiation from late slip for the December 26, 2004 Sumatra-Andaman (Mw = 9.15) earthquake. / Velasco, Aaron A.; Ammon, Charles J.; Lay, Thorne.

In: Geophysical Research Letters, Vol. 33, No. 18, L18305, 28.09.2006.

Research output: Contribution to journalArticle

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