Combining seismic arrays to image the high-frequency characteristics of large earthquakes

Eric Kiser, Miaki Ishii

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

This study investigates the source properties of the 2007 8.0 Pisco, Peru, 2007 8.4 and 7.9 Mentawai Islands, Indonesia, 2009 8.1 Samoa Islands and 2010 8.8 Maule, Chile, earthquakes using a backprojection technique that utilizes data from multiple seismic arrays. Combining seismic arrays increases azimuth and distance coverage and improves lateral resolution. The four subduction interface events show rupture propagation towards the bottom of the seismogenic zone. In addition, all of the earthquakes show evidence of multiple rupture segments with varying rupture speeds and directions. Relating these segments to the specific features of the subduction zones (e.g. interseismic coupling) suggests that asperity sizes may be controlled by subtle features of the subducted slab.

Original languageEnglish (US)
Pages (from-to)1117-1128
Number of pages12
JournalGeophysical Journal International
Volume188
Issue number3
DOIs
StatePublished - Mar 1 2012
Externally publishedYes

Fingerprint

rupture
Earthquakes
Samoa
earthquakes
earthquake
Peru
Indonesia
Chile
azimuth
slabs
asperity
subduction zone
propagation
slab
subduction
Direction compound
speed

Keywords

  • Earthquake dynamics
  • Earthquake source observations
  • Seismicity and tectonics
  • Subduction zone processes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Combining seismic arrays to image the high-frequency characteristics of large earthquakes. / Kiser, Eric; Ishii, Miaki.

In: Geophysical Journal International, Vol. 188, No. 3, 01.03.2012, p. 1117-1128.

Research output: Contribution to journalArticle

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