Quasi-static slip on the plate boundary associated with the 2003 M8.0 Tokachi-oki and 2004 M7.1 off-Kushiro earthquakes, Japan

Naoki Uchida, Satoshi Yui, Satoshi Miura, Toru Matsuzawa, Akira Hasegawa, Yoshinobu Motoya, Minoru Kasahara

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

We analyzed small repeating earthquakes recorded over a 13-year period and GPS data recorded over an 8-month period to estimate interplate quasi-static slip associated with the 2003 Tokachi-oki earthquake (M8.0) and the 2004 off-Kushiro earthquake (M7.1). The repeating-earthquake analysis revealed that the slip rate near the source region of the Tokachi-oki earthquake was relatively low (< 5 cm/year) prior to the earthquake; however, in the last 3 years leading up to the event, a minor acceleration in slip occurred upon the deeper extension of the coseismic slip area of the earthquake. Repeating-earthquake and GPS data indicate that large amounts of afterslip occurred around the rupture area following the earthquake; the afterslip mainly propagated to the east of the coseismic slip area. We also infer that the occurrence of the 2004 off-Kushiro earthquake, located about 100 km northeast of the epicenter of the Tokachi-oki earthquake, was advanced by the afterslip associated with the Tokachi-oki earthquake.

Original languageEnglish
Pages (from-to)527-533
Number of pages7
JournalGondwana Research
Volume16
Issue number3-4
DOIs
Publication statusPublished - 2009 Dec 1

Keywords

  • Afterslip
  • GPS data analysis
  • Quasi-static slip
  • Small repeating earthquake
  • Subduction tectonics

ASJC Scopus subject areas

  • Geology

Fingerprint Dive into the research topics of 'Quasi-static slip on the plate boundary associated with the 2003 M8.0 Tokachi-oki and 2004 M7.1 off-Kushiro earthquakes, Japan'. Together they form a unique fingerprint.

Cite this