Crustal tomography of the 2016 Kumamoto earthquake area inWest Japan using P and PmP data

Haibo Wang, Dapeng Zhao, Zhouchuan Huang, Mingjie Xu, Liangshu Wang, Yukihisa Nishizono, Hirohito Inakura

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

A high-resolution model of 3-D P-wave velocity (Vp) tomography of the crust in the source area of the 2016 Kumamoto earthquake (M 7.3) in West Japan is determined using a large number of arrival times of first P waves and reflected P waves from the Moho discontinuity (PmP). The PmP data are collected from original seismograms of the Kumamoto aftershocks and other local crustal events in Kyushu. Detailed resolution tests show that the addition of the PmP data can significantly improve the resolution of the crustal tomography, especially that of the lower crust. Our results show that significant low-velocity (low-V) anomalies exist in the entire crust beneath the active volcanoes, which may reflect the pathway of arc magma. The 2016 Kumamoto earthquake occurred at the edge of a small low-V zone in the upper crust. A significant low-V anomaly is revealed in the lower crust beneath the source zone, which may reflect the arc magma and fluids ascending from the mantle wedge. These results suggest that the rupture nucleation of the 2016 Kumamoto earthquake was affected by fluids and arc magma.

Original languageEnglish
Pages (from-to)1151-1163
Number of pages13
JournalGeophysical Journal International
Volume214
Issue number2
DOIs
Publication statusPublished - 2018 Aug 1

Keywords

  • Crustal imaging
  • Crustal structure
  • Seismic tomography
  • Seismicity and tectonics

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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