Influence of crustal lithology and the thermal state on microseismicity in the Wakayama region, southern Honshu, Japan

Sumire Maeda, Shinji Toda, Toru Matsuzawa, Makoto Otsubo, Takumi Matsumoto

研究成果: Article査読

4 被引用数 (Scopus)

抄録

Here we investigate the influence of the lithology and thermal state of the upper crust on earthquake distributions beneath the Wakayama region, southern Honshu, Japan, to better understand the influence of crustal conditions on regional seismogenesis. The earthquakes are concentrated in the deeper sections of mafic belts and shallower sections of pelitic belts, based on a comparison of relocated hypocenters and estimated subsurface geological structures. We compare the frictional properties of pelitic rocks and basalt, as obtained from petrological experiments, with the hypocenter depth distributions in pelitic and mafic belts to assess the control of crustal lithology on the depth extent of regional seismicity. The earthquake distributions are consistent with the temperature ranges over which the respective rock types are expected to exhibit a velocity-weakening behavior, based on the petrological experiments. The results suggest that the occurrence of shallow intraplate earthquakes is controlled by the temperature- and lithology-dependent friction of the upper crust. [Figure not available: see fulltext.]

本文言語English
論文番号173
ジャーナルearth, planets and space
73
1
DOI
出版ステータスPublished - 2021 12月

ASJC Scopus subject areas

  • 地質学
  • 宇宙惑星科学

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