Local earthquake reflection tomography of the Landers aftershock area

Dapeng Zhao, Sachiko Todo, Jianshe Lei

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

A detailed tomographic image of the crust in the 1992 Landers earthquake (M 7.3) region in southern California is determined by using the first arriving S-waves and the reflected S-waves from the Moho discontinuity (SmS, sSmS) generated by the Landers aftershocks. These data were recorded by two seismic stations that are separated by about 200 km. The tomographic image obtained has a lateral resolution of 25-35 km (1/6 to 1/8 of the station spacing). This work indicates that crustal reflected waves are very useful to improve the spatial resolution of crustal tomography. Our results show a tendency for areas rich in seismicity to be associated with higher velocities, suggesting that earthquake occurrence is closely related to the in situ structural heterogeneities of the fault zone.

Original languageEnglish
Pages (from-to)623-631
Number of pages9
JournalEarth and Planetary Science Letters
Volume235
Issue number3-4
DOIs
Publication statusPublished - 2005 Jul 15
Externally publishedYes

Keywords

  • Local earthquakes
  • Moho discontinuity
  • Reflected waves
  • Seismic tomography
  • Spatial resolution

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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