SCSIO OpenIR  > 中科院边缘海地质重点实验室
Seismic velocity imaging and tectonic characteristics of the bidirectional subducting slabs under Philippine Archipelago
Tan HaoYuan1; Wang Zhi
2018
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume61Issue:12Pages:4887
AbstractThe complicated geological settings and tectonics of the Philippine Archipelago is mainly caused by the convergence of the Eurasian, the Philippine Sea and the Indian-Austrian plates. Although a few seismic tomographic studies have been conducted in the Philippine Archipelago, most of them focused on the Manila Trench, Luzon Island arc and the middle Philippine. So far few P- and S-wave tomographic studies in the crust and upper mantle of the Philippine Archipelago and its surrounding regions have been carried out. We obtained V-P and V-S velocity structures of Philippine Archipelago for the first time by inverting 155779 P-wave rays and 59642 S-wave rays simultaneously. Our seismic tomography shows strong heterogeneities seated in the crust and upper mantle beneath Philippine Archipelago. Widely spread low velocity anomalies emerge in the crust which may be caused by dehydration of oceanic crusts and sediments whereas high velocity anomalies extend along trenches around Philippines. Smaller dip angle and weaker subduction activity in the middle part of South China Sea Plate than the south part are shown. Little subduction can be seen in the south terminal of East Luzon Trough and northern part of Philippine Trench, which could be ascribed to the subduction of Benham Rise. We therefore suggest that strong coupling between Philippine Sea Plate and Eurasia Plate is revealed by the occurrence of M-W>6. 0 earthquakes along plate boundaries, weak coupling between 16 degrees N to 20 degrees N in South China Sea slab along Manila Trench might be caused by the extensional stress in north Luzon, on the contrary, strong coupling are shown south of 16 degrees N. On the east side of Philippine Archipelago, no big earthquake occurred north of 14 degrees N in the Philippine Sea Plate, interpolate coupling becomes stronger from north to south, coupling extent is much bigger to the south of 12 degrees N than to the north. Besides, strong coupling exists between Sulu Sea basin and Philippine Mobile Belt too.
DepartmentMSG
KeywordSeismic tomography Manila Trench Bidirectional subduction V-P and V-S structure Interplate coupling
DOI10.6038/cjg2018L0792
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17661
Collection中科院边缘海地质重点实验室
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Tan HaoYuan,Wang Zhi. Seismic velocity imaging and tectonic characteristics of the bidirectional subducting slabs under Philippine Archipelago[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2018,61(12):4887, 4900.
APA Tan HaoYuan,&Wang Zhi.(2018).Seismic velocity imaging and tectonic characteristics of the bidirectional subducting slabs under Philippine Archipelago.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,61(12),4887.
MLA Tan HaoYuan,et al."Seismic velocity imaging and tectonic characteristics of the bidirectional subducting slabs under Philippine Archipelago".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 61.12(2018):4887.
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