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Open Access

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

  • Manabu Hashimoto111Email author,
  • Hiroaki Takahashi211,
  • Ryosuke Doke311,
  • Minoru Kasahara211,
  • Akira Takeuchi311,
  • Kenusuke Onoue111,
  • Yoshinobu Hoso111,
  • Yo Fukushima111,
  • Kajuro Nakamura111,
  • Fumio Ohya111,
  • Ryo Honda211,
  • Masayoshi Ichiyanagi211,
  • Teruhiro Yamaguchi211,
  • Takahiro Maeda211 and
  • Yoshihiro Hiramatsu411
Earth, Planets and Space200860:BF03352775

https://doi.org/10.1186/BF03352775

Received: 29 June 2007

Accepted: 13 November 2007

Published: 19 February 2008

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.

Key words

Noto peninsula earthquakeGPScrustal deformationpostseismic deformationafterslip

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