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The plate contact geometry investigation based on earthquake source parameters at the Burma arc subduction zone

Science China Earth Sciences 2013年第4期56卷 806-817页

作者： ZHANG LangPing SHAO ZhiGang MA HongSheng WANG XingZhou LI ZhiHai Key Laboratory of Earthquake Prediction Institute of Earthquake ScienceChina Earthquake Administration China Earthquake Administration Earthquake Administration of Anhui Province Earthquake Administration of Xinjiang Uygur Autonomous Region

Accurately characterizing the threedimensional geometric contacts between the crust of the Chinese mainland and adjacent regions is important for understanding the dynamics of this part of Asia from the viewpoint of global plate systems. In this pa per, a method is introduced to investigate the geometric contacts between the Eurasian and Indian plates at the Burma arc sub duction zone using earthquake source parameters based on the Slabl.0 model of Hayes et al. （2009, 2010）. The distribution of earthquake focus depths positioned in 166 sections along the Burma Arc subduction zone boundary has been investigated. Linear plane fitting and curved surface fitting has been performed on each section. Threedimensional geometric contacts and the extent of subduction are defined quantitatively. Finally, the focal depth distribution is outlined for six typical sections along the Burma arc subduction zone, combining focal mechanisms with background knowledge of geologic structure. Possible dy namic interaction patterns are presented and discussed. This paper provides an elementary method for studying the geometric contact of the Chinese mainland crust with adjacent plates and serves as a global reference for dynamic interactions between plates and related geodynamic investigations.

关键词： Burma arc subduction zone earthquake source parameters plate boundary geometric contact Slab1.0 model

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