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Effects of the heterogeneous subducting plate on seismicity: Constraints from b-values in the Andaman-Sumatra-Java subduction zone
Zhou, Pengxiang3; Xia, Shaohong1,2
2020
Source PublicationPHYSICS OF THE EARTH AND PLANETARY INTERIORS
ISSN1872-7395
Volume304Pages:106499
AbstractThe Andaman-Sumatra-Java subduction zone is characterized by significant spatial variations in subducting plate age, subduction velocity, and slab bending. With (i) the uplifting controlled by the Ninety East Ridge in the north, (ii) trench eroding affected by the Roo Rise in the south, and (iii) the highly deformed Warton Basin in front of the trench cut through by a series of strike-slip faults, the entire subducting plate exhibits strong spatial heterogeneity. In this paper, we investigated the effect of the heterogeneous subducting plate on seismicity based on the comparison between the spatial variations in the b-value of the Gutenberg-Richer Law and in the tectonic features of the subducting oceanic plate. We used the International Seismological Centre, EHB Bulletin (ISC-EHB) from 1970 to 2013 to conduct a detailed study of b-value spatial variations in the Andaman-Sumatra-Java subduction zone. Via the inter-comparison of tectonic factors, we found that the subduction zone was tectonically segmented. There are good positive correlations between b-value and subducting plate age in two tectonic domains after removing the influence of local tectonic irregularities, which implies that the subducting plate density generally controls the stress and coupling between the plates. The subduction of local tectonic irregularities, such as the fracture zones and seamounts, has significantly affected seismicity, which prevents the occurrence of large earthquakes and causes the b-value to rise. In addition, the anomalous tectonic environments, such as the spreading center, and the thrust fault zones, could also impact spatial variations of the b-value. Therefore, seismicity in subduction zones is a result of the combined impacts of complex tectonic features. Understanding and clarifying the mechanisms of these tectonic features in relation to b-values can help us to better assess seismic risk in subduction zones.
DepartmentOMG
Keywordb-value Andaman-Sumatra-Java subduction zone Stress Seismicity
DOI10.1016/j.pepi.2020.106499
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Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/18539
Collection中科院边缘海地质重点实验室
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou, Peoples R China
2.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou, Peoples R China
3.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Zhou, Pengxiang,Xia, Shaohong. Effects of the heterogeneous subducting plate on seismicity: Constraints from b-values in the Andaman-Sumatra-Java subduction zone[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2020,304:106499.
APA Zhou, Pengxiang,&Xia, Shaohong.(2020).Effects of the heterogeneous subducting plate on seismicity: Constraints from b-values in the Andaman-Sumatra-Java subduction zone.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,304,106499.
MLA Zhou, Pengxiang,et al."Effects of the heterogeneous subducting plate on seismicity: Constraints from b-values in the Andaman-Sumatra-Java subduction zone".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 304(2020):106499.
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