气候变化领域集成服务门户(CCPortal): Two-Dimensional Thermal Modeling of the Philippine Sea Plate Subduction in Central Japan: Implications for Gap of Low-Frequency Earthquakes and Tectonic Tremors

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DOI	10.1029/2018JB017068
	Two-Dimensional Thermal Modeling of the Philippine Sea Plate Subduction in Central Japan: Implications for Gap of Low-Frequency Earthquakes and Tectonic Tremors
	Suenaga, Nobuaki; Yoshioka, Shoichi; Matsumoto, Takumi; Manea, Vlad C.; Manea, Marina; Ji, Yingfeng
通讯作者	Suenaga, N (通讯作者)
发表日期	2019
ISSN	2169-9313
EISSN	2169-9356
起始页码	6848
结束页码	6865
卷号	124 期号:7
英文摘要	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.
关键词	SOUTHWEST JAPAN EPISODIC TREMOR SEISMOGENIC ZONE NANKAI TROUGH UPPER SURFACE BENEATH DEHYDRATION TEMPERATURE PACIFIC DEEP
英文关键词	2-D thermal modeling; water content distribution; heat flow
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000481819500036
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259606
推荐引用方式 GB/T 7714	Suenaga, Nobuaki,Yoshioka, Shoichi,Matsumoto, Takumi,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]. 中国科学院青藏高原研究所,2019,124(7).
APA	Suenaga, Nobuaki,Yoshioka, Shoichi,Matsumoto, Takumi,Manea, Vlad C.,Manea, Marina,&Ji, Yingfeng.(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).
MLA	Suenaga, Nobuaki,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).