Postseismic displacements following the 2007 Noto peninsula earthquake detected by dense GPS observation

Manabu Hashimoto, Hiroaki Takahashi, Ryosuke Doke, Minoru Kasahara, Akira Takeuchi, Kenusuke Onoue, Yoshinobu Hoso, Yo Fukushima, Kajuro Nakamura, Fumio Ohya, Ryo Honda, Masayoshi Ichiyanagi, Teruhiro Yamaguchi, Takahiro Maeda, Yoshihiro Hiramatsu

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We have been conducting dense GPS observation in and around the epicentral region of the 2007 Noto peninsula earthquake since March 25, 2007, in order to detect postseismic displacements. Continuous observation has been underway at 12 sites to fill the gap of GEONET. Preliminary analysis of data up to early May shows that initial postseismic displacement rapidly decayed within 20 days after the occurrence of the mainshock. Horizontal displacements do not exceed 20 mm even at sites above the aftershock zone for this period. We also found a maximum uplift of about 20 mm there. Inversion of postseismic displacements with the variable slip model suggests a nearly right-lateral afterslip of less than 5 cm on the shallow portion of the source fault. Fitting a theoretical function to a time series of coordinate changes also suggests that the observed postseismic displacements might have been generated by afterslip.

Original languageEnglish
Pages (from-to)139-144
Number of pages6
Journalearth, planets and space
Volume60
Issue number2
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Afterslip
  • Crustal deformation
  • GPS
  • Noto peninsula earthquake
  • Postseismic deformation

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

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