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Two-Dimensional Thermal Modeling of the Philippine Sea Plate Subduction in Central Japan: Implications for Gap of Low-Frequency Earthquakes and Tectonic Tremors
Suenaga, N (Suenaga, Nobuaki)1; Yoshioka, S (Yoshioka, Shoichi)1,2; Matsumoto, T (Matsumoto, Takumi)3; Manea, VC (Manea, Vlad C.)4,5; Manea, M (Manea, Marina)4,5; Ji, YF (Ji, Yingfeng)6,7
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
2019
Volume124Issue:7Pages:6848-6865
DOI10.1029/2018JB017068
Abstract

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 degrees 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.

Subject AreaGeosciences
WOS IDWOS:000481819500036
Language英语
Indexed BySCI
KeywordSouthwest Japan Episodic Tremor Seismogenic Zone Nankai Trough Upper Surface Beneath Dehydration Temperature Pacific Deep
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国际
ISSN2169-9313
Department大陆碰撞与高原隆升重点实验室
URL查看原文
PublisherAMER GEOPHYSICAL UNION
SubtypeArticle
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9241
Collection图书馆
Corresponding AuthorSuenaga, N (Suenaga, Nobuaki)
Affiliation1.Kobe Univ, Grad Sch Sci, Dept Planetol, Kobe, Hyogo, Japan;
2.Kobe Univ, Res Ctr Urban Safety & Secur, Kobe, Hyogo, Japan;
3.Natl Res Inst Earth Sci & Disaster Resilience, Tsukuba, Ibaraki, Japan;
4.Univ Nacl Autonoma Mexico, Ctr Geociencias, Computat Geodynam Lab, Campus Juriquilla, Queretaro, Mexico;
5.Romanian Acad, Astron Inst, Bucharest, Romania;
6.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China;
7.Chinese Acad Sci, Inst Tibetan Plateau, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Suenaga, N ,Yoshioka, S ,Matsumoto, T ,et al. Two-Dimensional Thermal Modeling of the Philippine Sea Plate Subduction in Central Japan: Implications for Gap of Low-Frequency Earthquakes and Tectonic Tremors[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019,124(7):6848-6865.
APA Suenaga, N ,Yoshioka, S ,Matsumoto, T ,Manea, VC ,Manea, M ,&Ji, YF .(2019).Two-Dimensional Thermal Modeling of the Philippine Sea Plate Subduction in Central Japan: Implications for Gap of Low-Frequency Earthquakes and Tectonic Tremors.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,124(7),6848-6865.
MLA Suenaga, N ,et al."Two-Dimensional Thermal Modeling of the Philippine Sea Plate Subduction in Central Japan: Implications for Gap of Low-Frequency Earthquakes and Tectonic Tremors".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 124.7(2019):6848-6865.
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