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  1. 防災科研関係論文

Two-Dimensional Thermal Modeling of the Philippine Sea Plate Subduction in Central Japan: Implications for Gap of Low-Frequency Earthquakes and Tectonic Tremors

https://nied-repo.bosai.go.jp/records/4582
https://nied-repo.bosai.go.jp/records/4582
b98232ab-7fb4-4aba-af78-165215ac8eaf
Item type researchmap(1)
公開日 2024-05-13
タイトル
言語 en
タイトル Two-Dimensional Thermal Modeling of the Philippine Sea Plate Subduction in Central Japan: Implications for Gap of Low-Frequency Earthquakes and Tectonic Tremors
著者 Nobuaki Suenaga

× Nobuaki Suenaga

en Nobuaki Suenaga

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Shoichi Yoshioka

× Shoichi Yoshioka

en Shoichi Yoshioka

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Takumi Matsumoto

× Takumi Matsumoto

en Takumi Matsumoto

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Vlad C. Manea

× Vlad C. Manea

en Vlad C. Manea

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Marina Manea

× Marina Manea

en Marina Manea

Search repository
Yingfeng Ji

× Yingfeng Ji

en Yingfeng Ji

Search repository
抄録
内容記述タイプ Other
内容記述 ©2019. American Geophysical Union. All Rights Reserved. We performed 2-D high-resolution thermomechanical numerical simulations associated with subduction of the Philippine Sea (PHS) plate in central Japan, where a well-defined gap of low-frequency earthquakes (LFEs) and tectonic tremors (TTs) is observed. We investigate the complex relationships among megathrust earthquakes, LFEs, TTs, and interplate temperature distributions and dehydrations caused by phase transformations of hydrous mid-ocean ridge basalt (MORB) of the oceanic crust and ultramafic rock of the slab mantle. Our models predict a temperature range of 480–600 °C corresponding to both active LFEs and TTs regions and their gap region located on the upper surface of the PHS plate. A moderate amount of fluids (<0.8 wt%) is released due to phase transformations of the hydrous MORB near the thermally estimated seismogenic zone on the upper surface of the PHS plate. Hydrous MORB was found to transform from greenschist to epidote amphibole, releasing a small amount of fluids (>0.3 wt%) near the belt-like form regions of LFEs and TTs. We found that the total amount of dehydrated water near the active region of LFEs and TTs is larger than that near the gap of LFEs and TTs. Our modeling results show that this difference stems from the presence of the phase transformation from epidote amphibole to eclogite in the former, and it may play a significant role for the occurrence of LFEs and TTs. The difference in the amount of released fluid between the active and gap regions of LFEs and TTs may be related to their generation mechanism.
言語 en
書誌情報 en : Journal of Geophysical Research: Solid Earth

巻 124, 号 7, p. 6848-6865, 発行日 2019
ISSN
収録物識別子タイプ EISSN
収録物識別子 2169-9356
DOI
関連識別子 10.1029/2018JB017068
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