Seismic activity and deformation process of the overriding plate in the northeastern Japan subduction zone

Akira Hasegawa, Akira Yamamoto, Norihito Umino, Satoshi Miura, Shigeki Horiuchi, Dapeng Zhao, Hiroki Sato

研究成果: Article査読

56 被引用数 (Scopus)

抄録

We estimated the temperature distribution within the crust of the northeastern Japan arc from P wave velocity perturbations obtained by travel time tomography. By comparing the estimated temperature distribution with the focal depth distribution of shallow, precisely relocated microearthquakes, we found that the brittle to ductile or stick-slip to stable-sliding transition occurs at the ~400°C isotherm and that the transition depth has considerable lateral variations. The brittle seismogenic zone, the upper portion of the crust, becomes locally thin in the P wave low-velocity areas, where the temperature is estimated to be relatively high. Concentration of shallow microearthquakes, high topography and relatively large contractile deformation of the crust are also observed in these low-velocity areas. Active faults are not distributed in the low-velocity areas but lie just along the edge of those areas or outside them. All these observations suggest that earthquake occurrence and deformation within the crust is governed, to a considerable degree, by the thermal regime of this volcanic arc, which is characterized by a horizontally inhomogeneous distribution of temperature. (C) 2000 Elsevier Science B.V. All rights reserved.

本文言語English
ページ(範囲)225-239
ページ数15
ジャーナルTectonophysics
319
4
DOI
出版ステータスPublished - 2000 4月 20

ASJC Scopus subject areas

  • 地球物理学
  • 地表過程

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