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| DOI | 10.1016/j.tecto.2021.228862 |
| Strike-slip seismicity at the Andaman-Sumatra Subduction Zone: Role of the fracture zones and age of the subducting lithosphere | |
| Jacob J.; Dyment J.; Ghosal D.; Dewangan P. | |
| 发表日期 | 2021 |
| ISSN | 00401951 |
| 卷号 | 811 |
| 英文摘要 | A better comprehension of the shallow strike-slip seismicity along the Sunda Trench is achieved by superimposing the Wharton basin fracture zones, magnetic isochrones, and focal mechanisms to the geometry of the subducting plate. The shallow strike-slip seismicity is generally associated with the north-south trending fracture zones of the basins, which segment the subducting lithosphere into eight main compartments named A-H. Strike-slip earthquakes with magnitudes higher than 4.5 Mw in the time period of 2004–2019 are examined with respect to the thickness and density of the subducting lithosphere, estimated from the lithospheric age. Bulk density ranges from ~3258 to ~3272 and lithospheric thickness from ~74 to ~112 km between the younger fossil spreading axis and the older Compartment H, respectively. ‘Subductability’, a parameter calculated from lithospheric thickness and bulk density, is coined to represent the easiness of subduction and varies for each spreading compartment depending on the lithospheric age. We propose the correlation between the shallow strike-slip seismicity and the contrasts of lithospheric thickness, density and subductability. Considering the available seismic records from the past four decades, a prominent cluster of strike-slip earthquakes is observed along Fracture Zone B-C, which displays a strong subductability contrast, whereas other fracture zones displaying only minor seismicity correspond to low subductability contrasts. Despite a high subductability contrast, slab tearing on the subducting Investigator Fracture Zone between Compartments G and H prevents the generation of strike-slip earthquakes. This result emphasizes the importance of physical and mechanical properties of the subducting lithosphere in localizing the seismicity at subduction zones. © 2021 Elsevier B.V. |
| 关键词 | Andaman-Sumatra Subduction ZoneFracture zonesLithospheric ageStrike-slip earthquakesSubductability |
| 英文关键词 | Fracture; Focal mechanism; Lithospheric age; Lithospheric thickness; Physical and mechanical properties; Seismic records; Strike-slip earthquakes; Subducting plate; Subduction zones; Earthquakes; age; bulk density; earthquake magnitude; fracture zone; seismic data; seismicity; strike-slip fault; subduction zone; Andaman Fault Zone; Greater Sunda Islands; Indian Ocean; Sumatra; Sunda Isles |
| 语种 | 英语 |
| 来源期刊 | Tectonophysics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207993 |
| 作者单位 | CSIR-National Institute of Oceanography, Dona Paula, Goa 403004, India; Université de Paris, Institut de physique du globe de Paris et CNRS, Paris, France; Indian Institute of Technology Kanpur, Kanpur, U.P. 208016, India |
| 推荐引用方式 GB/T 7714 | Jacob J.,Dyment J.,Ghosal D.,et al. Strike-slip seismicity at the Andaman-Sumatra Subduction Zone: Role of the fracture zones and age of the subducting lithosphere[J],2021,811. |
| APA | Jacob J.,Dyment J.,Ghosal D.,&Dewangan P..(2021).Strike-slip seismicity at the Andaman-Sumatra Subduction Zone: Role of the fracture zones and age of the subducting lithosphere.Tectonophysics,811. |
| MLA | Jacob J.,et al."Strike-slip seismicity at the Andaman-Sumatra Subduction Zone: Role of the fracture zones and age of the subducting lithosphere".Tectonophysics 811(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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