Reexamination of the interplate coupling in the Tokai region, central Japan, based on the GPS data in 1997-2002

Yusaku Ohta, Fumiaki Kimata, Takeshi Sagiya

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

We re-examined the interplate coupling in terms of backslip rate at the Nankai-Suruga trough beneath the Tokai region with a 3-dimensional GPS time series and a refined plate boundary model. We reanalyzed the GPS data and reconstructed plate boundary configuration. Then we inverted GPS velocities to infer the interplate coupling during April 1997 to April 2000. Our results show that a maximum back slip rate of 2 cm/yr was found at the depth of 15-25 km around 137.42E, 34.32N. We also estimated interplate coupling for the period from January 2001 to December 2002. This time period coincides with a slow slip event found by Ozawa et al. [2002]. Forward slip up to 3 cm/yr was inferred beneath western region of Lake Hamana. And, we found that the epicenters of low frequency tremors are located there, suggestive of a close connection between the occurrences of the slow slip event (SSE) and low frequency tremors.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Volume31
Issue number24
DOIs
Publication statusPublished - 2004 Dec 28
Externally publishedYes

Keywords

  • 1206 Geodesy and gravity: Crustal movements - Interplate (8155)
  • 8150 Tectonophysics: Plate boundary - General (3040)
  • 8158 Tectonophysics: Plate motions - Present and recent (3040)

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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