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Implications of earthquakes for the slab subduction dynamic process in Southeast Asia

机译：地震对东南亚板坯俯冲动态过程的影响

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摘要

Earthquake geohazards that occur throughout the Borneo Block, especially in SW Borneo, cannot be reconciled within the classical earthquake mechanism and a uniform stress field, and unfulfilled earthquake forecast for many years. In this paper, we present a new inventory of 37 Borneo earthquakes, and focal mechanisms show that in NE Borneo earthquakes and aftershocks are dominated by NW-trending normal faults, in East Borneo earthquakes are controlled by the reactivation of NW-trending sinistral strike-slip faults, and the NE-trending thrusts acted as the main seismogenic faults in the SE Borneo seismicity zone. We calculated the Coulomb stress and observed the shallow faults exhibiting a high coefficient response to the Coulomb stress change and all these earthquakes under the Coulomb failure regime have decreased by the stress shadows or are triggered by dynamic stress increase and propagation. We performed a research using the horizontal GPS velocity displacements and vertical seismic sections and found that the micro-blocks convergence occurred here corresponding to the Coulomb stress distribution, and can best explain the earthquake mechanism within the "Borneo Block". Additionally, the earthquakes in SW Borneo showing a concordant focal mechanism along the Red-River Fault-Tinjar Fault-Sumatra Trench, are deduced to have formed along the "Sunda Block" boundary. Finally, the micro block boundaries determined from the heatflux map can be effective in describing the main and aftershocks distribution in SE Asia, and the deep-shallow coupling dynamic model is proposed to solve the stress loading for these crustal-scale earthquakes and the responses to plate convergence in SE Asia.
机译：在整个婆罗洲块中发生的地震地质曲线，特别是在SW婆罗洲，不能在经典的地震机制和统一的压力领域和均匀的地震预测中进行调整。在本文中，我们展示了37个婆罗洲地震的新库存，并侧重机制表明，在NE婆罗洲地震和余震中，由NW趋势正常断层占据主导，在东部地震中受到NW趋势的重新激活 - 滑移断层，NE-趋势推力作为SE婆罗洲地震区中的主要发震缺陷。我们计算了库仑应力，观察到对库仑应力变化的高系数响应的浅扰，并且在库仑失效制度下的所有这些地震都会通过应力阴影降低或通过动态应力增加和传播触发。我们使用水平GPS速度位移和垂直地震切片进行了研究，发现微块收敛在此对应于库仑应力分布，并且最好解释“婆罗洲块”内的地震机制。此外，SW Borneo的地震显示沿着红河故障 - Tinjar故障 - 苏门答腊沟槽的一致焦点机制，以沿着“Sunda块”边界形成。最后，从热流式映射确定的微块边界可以有效地描述SE亚洲的主要和余震分布，并且提出了深浅的耦合动态模型来解决这些地壳地震的应力负荷和对的反应亚洲的板材融合。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第1期|103955.1-103955.9|共9页
  • 作者

    Hui Gege; Li Sanzhong; Wang Pengcheng; Suo Yanhui; Somerville I. D.;

  • 作者单位

    Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Prov Key Lab Geodynam & Geohazards Guangzhou 510275 Peoples R China;

    Ocean Univ China Coll Marine Geosci Inst Adv Ocean Study Key Lab Submarine Geosci & Prospecting Tech MOE Qingdao 266100 Peoples R China;

    Ocean Univ China Coll Marine Geosci Inst Adv Ocean Study Key Lab Submarine Geosci & Prospecting Tech MOE Qingdao 266100 Peoples R China;

    Ocean Univ China Coll Marine Geosci Inst Adv Ocean Study Key Lab Submarine Geosci & Prospecting Tech MOE Qingdao 266100 Peoples R China;

    Univ Coll Dublin UCD Sch Earth Sci Dublin 4 Ireland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Borneo block; Sunda block; Coulomb stress change; Micro-blocks; Earthquake;

    机译：婆罗洲街区;Sunda块;库仑压力变化;微块;地震;

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