Geodetic data inversion using ABIC to estimate slip history during one earthquake cycle with viscoelastic slip-response functions

Yukitoshi Fukahata, Akira Nishitani, Mitsuhiro Matsu'ura

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

We developed a new method of geodetic data inversion to estimate slip history at a plate interface by using Akaike's Bayesian Information Criterion (ABIC). In this method we considered the effects of viscoelastic stress relaxation in the asthenosphere, which cannot be neglected to estimate slip history at a plate interface during one earthquake cycle. We also introduced a proper formulation to incorporate two sorts of partially dependent prior information into observed data by Bayes' rule. By applying the new inversion method to levelling data for 1893-1983 in Shikoku, Southwestern Japan, we reconstructed the pattern of space-time variation in slip motion during one earthquake cycle, including the 1946 Nankai earthquake, at the interface between the Eurasian and the Philippine Sea plates. The result shows that a steady slip motion at a plate convergence rate (40 mm yr-1) proceeds in the shallow and the deep regions through the entire earthquake cycle. In the intermediate depth range (10-30 km), on the other hand, an instantaneous slip of approximately 4 m occurs at the time of the Nankai earthquake. After that, this portion keeps in stationary contact until the occurrence of the next Nankai earthquake. If we neglect the effects of viscoelastic stress relaxation, the inversion analysis gives geophysically unrealistic results.

Original languageEnglish
Pages (from-to)140-153
Number of pages14
JournalGeophysical Journal International
Volume156
Issue number1
DOIs
Publication statusPublished - 2004 Jan
Externally publishedYes

Fingerprint

datum (elevation)
data inversion
geodetic datum
Earthquakes
slip
earthquakes
histories
inversions
earthquake
cycles
estimates
history
stress relaxation
Stress relaxation
Philippines
Philippine Sea plate
plate convergence
asthenosphere
leveling
Japan

Keywords

  • Earthquake cycle
  • Inversion
  • Nankai earthquake
  • Slip history
  • Viscoelasticity

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Geodetic data inversion using ABIC to estimate slip history during one earthquake cycle with viscoelastic slip-response functions. / Fukahata, Yukitoshi; Nishitani, Akira; Matsu'ura, Mitsuhiro.

In: Geophysical Journal International, Vol. 156, No. 1, 01.2004, p. 140-153.

Research output: Contribution to journalArticle

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