IGGCAS OpenIR  > 地球与行星物理院重点实验室
Stress regime inversion in the northwest Pacific subduction zone, the segment from northern Honshu, Japan to northeast China
Li TianJue1,2,3; Chen QiFu1,2,3
2019-02-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume62Issue:2Pages:520-533
AbstractThe northwestern Pacific region is one of the most typical and concentrated subduction zone on the Earth, and it has been taken as a very important region for subduction zone study. The Benioff zone from northeastern Honshu, Japan to northeast China with abundant deep earthquakes provides a great opportunity for earth science study. Stress regime inversion in the subduction zone using focal mechanisms of earthquakes is an important field in the study of such area. This paper will adopt the Spatial and Temporal Stress Inversion program downloaded from USGS, which is compiled based on damped regional-scale stress inversion technique, to invert the spatial stress regimes in the full subduction zone (segments from its surface part to the deep end) by dividing all the Global CMT solutions of earthquakes between November 1976 and January 2017 into 10 schemes from a near east-west crossing profile. For the spatial stress regimes in the shallow part of the subduction zone, results of our inversion show that horizontal compression dominates on the landward side, while for the seaward side with predominant horizontal tension. Along the downward subducting slab, the principal stress rotates to be slab-parallel gradually. For the upper portion above the double seismic zone (depth of similar to 120 km) , the axis of the principal tension stress is parallel with the subducting slab while accompanied by a steeper dip. At the depth of similar to 120 km, the stress regime appears to be the typical I of double seismic zones (down-dip compression along the slab in the upper plane, and down-dip tension in the lower plane). For the deep portion of the slab, the stress regime turns to be down-dip compression gradually. For our study subduction zone, the compressional stress axes keep parallel to the subducting direction very well, suggesting significant action of slab pull and weak mantle support below. The tensional stress axes beneath the slab interface with depth range of intermediate-focus earthquakes tend to be parallel with the trench strike. It may be the subducting slab contortion below caused by the Kurile-Japan arc-arc junction that occurred in our study region.
KeywordNorthwest Pacific subduction zone Focal mechanism Stress regime inversion
DOI10.6038/cjg2019M0044
WOS KeywordWADATI-BENIOFF ZONE ; FOCAL-MECHANISM SOLUTIONS ; SEISMIC ZONE ; EARTHQUAKE ; FIELD ; TOHOKU ; ARC ; DEFORMATION ; LITHOSPHERE ; KURIL
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000457642800007
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90558
Collection地球与行星物理院重点实验室
Corresponding AuthorChen QiFu
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Li TianJue,Chen QiFu. Stress regime inversion in the northwest Pacific subduction zone, the segment from northern Honshu, Japan to northeast China[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2019,62(2):520-533.
APA Li TianJue,&Chen QiFu.(2019).Stress regime inversion in the northwest Pacific subduction zone, the segment from northern Honshu, Japan to northeast China.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,62(2),520-533.
MLA Li TianJue,et al."Stress regime inversion in the northwest Pacific subduction zone, the segment from northern Honshu, Japan to northeast China".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 62.2(2019):520-533.
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