Slip model for the 2011 M w 9.0 Sendai (Japan) earthquake and its M w 7.9 aftershock derived from GPS data

Fa Qi Diao, Xiong Xiong, Si Dao Ni, Yong Zheng, Can Ge

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Using GPS-measured coseismic and post-seismic displacements for the 8 h following the M w 9.0 Sendai earthquake of March 11, 2011, coseismic and post-seismic fault slip models were developed based on a layered crustal model. The geodetic moment magnitude of the main shock was measured as approximately M w 8.98. The slip exhibits clear reverse characteristics, with a maximum near the hypocenter, and a magnitude of about 23.3 m. Some strike-slip behavior may occur on the two sides of the peak rupture zone. Almost 90% of the seismic moments released by the main shock occurred at depths less than 40 km. The energy released by the fault slip in the 8 h following the main shock is approximately equal to an earthquake of M w 8.13. With a maximum of ~1.5 m, the post-seismic slip was concentrated in the southwestern part of the coseismic rupture fault, which agrees well with the location and behavior of the M w 7.9 aftershock. This implies that the post-seismic deformation in the 8 h after the main shock was mainly induced by the M w 7.9 aftershock. In addition, a post-seismic slip of 0.2-0.4 m was observed at the down-dip extension of the coseismic rupture, which may have been caused by the effect of after-slip during this period.

Original languageEnglish
Pages (from-to)2941-2947
Number of pages7
JournalChinese Science Bulletin
Volume56
Issue number27
DOIs
Publication statusPublished - Sep 2011
Externally publishedYes

Keywords

  • GPS data
  • great subduction zone earthquake
  • large aftershock
  • slip model inversion

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