Characteristics of a tsunamigenic megasplay fault in the Nankai Trough

Yasuhiro Yamada, Reona Masui, Takeshi Tsuji

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Slip on the shallow part of a megasplay fault that is an out-of-sequence thrust and branch of the main subduction plate boundary can cause devastating tsunamis after earthquakes. We analyzed the three-dimensional geometry, including dip amount and azimuths, roughness distributions, and thickness variations, of the shallow part of a megasplay fault in the Nankai Trough using a three-dimensional seismic data set. The fault is divided into three zones based on its geometry: thick, smooth, and simply convex in the east; complexly curved in the middle; and thin and kinked in the west. Results of scientific drilling indicate that the eastern region of the fault is most active, and local heterogeneities in fault geometry, including roughness and thickness, may control the slip on this part of the fault. The present findings can be used to evaluate the risk of future tsunamis arising from movement on shallow thrust faults at subduction margins. Key Points Slip on the shallow part of a fault is responsible for devastating tsunamis A smooth geometry of a shallow fault may result in higher tsunami potential The detailed geometry of shallow fault can be used to assess tsunami hazard

Original languageEnglish
Pages (from-to)4594-4598
Number of pages5
JournalGeophysical Research Letters
Volume40
Issue number17
DOIs
Publication statusPublished - Sep 12 2013

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troughs
trough
tsunami
geometry
slip
roughness
drilling
subduction
azimuth
thrust
hazards
margins
earthquakes
fault geometry
thrust fault
plate boundary
causes
dip
seismic data
hazard

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Characteristics of a tsunamigenic megasplay fault in the Nankai Trough. / Yamada, Yasuhiro; Masui, Reona; Tsuji, Takeshi.

In: Geophysical Research Letters, Vol. 40, No. 17, 12.09.2013, p. 4594-4598.

Research output: Contribution to journalArticle

Yamada, Yasuhiro ; Masui, Reona ; Tsuji, Takeshi. / Characteristics of a tsunamigenic megasplay fault in the Nankai Trough. In: Geophysical Research Letters. 2013 ; Vol. 40, No. 17. pp. 4594-4598.
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