Postseismic deformation following the 2005 West Off Fukuoka Prefecture Earthquake (M7.0) derived by GPS observation

Shigeru Nakao, Hiroaki Takahashi, Takeshi Matsushima, Yuhki Kohno, Masayoshi Ichiyanagi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

We constructed a temporary GPS network around the aftershock area of the 2005 West Off Fukuoka Prefecture Earthquake (M7.0) in order to investigate the characteristics of its postseismic deformation. Our GPS network data, as well as the GEONET data, were analyzed using Bernese GPS software. We detected notable postseismic deformation in horizontal components close to the fault plane. The observed maximum displacement was 5.6 cm at the GNKI site on Genkaijima Island. A logarithmic law was adapted to the coordinate time series data, revealing decay times from 2 to 23 days, similar to those obtained for the 2003 Tokachi-oki Earthquake (M8.0). The amount of postseismic slips on the fault was assessed using the coseismic fault model proposed by the Geographical Survey Institute (GSI). We derived an optimum fault model of postseismic slip on the shallow (less than 3 km depth) portion of the fault. Our findings indicate that postseismic slip occurred only in shallow parts of the coseismic fault.

Original languageEnglish
Pages (from-to)1617-1620
Number of pages4
Journalearth, planets and space
Volume58
Issue number12
DOIs
Publication statusPublished - 2006

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

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