Reproducibility of spatial and temporal distribution of aseismic slips in Hyuga-nada of southwest Japan

Ryoko Nakata, Shin’ichi Miyazaki, Mamoru Hyodo, Takane Hori

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The Hyuga-nada region of southwest Japan, which is located off the east coast of Kyushu Island, may have the potential to generate great interplate earthquakes along the Nankai trough in the future. In this area, thrust earthquakes of M = 6.7–7.2 have occurred with recurrence intervals of approximately 30 years. In association with these earthquakes, possible local heterogeneities of plate coupling may be expected within 100 km from the coast in the Hyuga-nada region. We investigate numerical experiments to determine the spatial and temporal resolution of slip on the plate interface beneath the Hyuga-nada offshore region. For this purpose, we calculated synthetic displacement data from the result of numerical simulation conducted for the afterslip following an Mw 6.8 earthquake, for existing global positioning system stations on land and planned ocean floor seismic network stations. The spatial and temporal distribution of fault slip is then estimated using a Kalman filter-based inversion. The slip distribution estimated by using ocean floor stations demonstrates that the heterogeneity of plate coupling is resolved approximately within 50 km from the coastal area. This heterogeneity corresponds to the coseismic area of an Mw 6.8 earthquake with a radius of 10 km. Our study quantitatively evaluates the spatial resolution of aseismic slip in the Hyuga-nada region. Analysis based on continuous ocean floor data is useful for resolving the spatial variations of heterogeneities in plate couplings.

Original languageEnglish
Pages (from-to)311-317
Number of pages7
JournalMarine Geophysical Research
Volume35
Issue number3
DOIs
Publication statusPublished - 2014 Sep
Externally publishedYes

Keywords

  • Afterslip
  • Inversion
  • Ocean floor observation network
  • Plate coupling

ASJC Scopus subject areas

  • Oceanography
  • Geophysics
  • Geochemistry and Petrology

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