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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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Rapid earthquake focal mechanism inversion using high-rate GPS velometers in sparse network

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Science China Earth Sciences 2015年第11期58卷 1970-1981,1页

作者： GUO AiZhi NI SiDao CHEN WeiWen Jeffrey T.FREYMUELLER SHEN ZhiChao State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences School of Earth and Space Sciences University of Science and Technology of China Geophysical Institute University of Alaska Fairbanks

In this study, we demonstrate an approach for inverting earthquake source parameters based on high-rate global positioning system （GPS） velocity seismograms. The velocity records obtained from single-station GPS velocity solutions with broadcast ephemeris are used directly for earthquake source parameter inversion using the Cut and Paste method, without requiring conversion of the velocity records into displacement records. Taking the E1 Mayor-Cucapah earthquake as an example, GPS velocity records from 10 stations with reasonable azimuthal coverage provide earthquake source parameters very close to those from the Global centroid moment tensor （Global CMT） solution. In sparse network tests, robust source parameters with acceptable bias can be achieved with as few as three stations. When the number of stations is reduced to two, the bias in rake angle becomes appreciable, but the magnitude and strike estimations are still robust. The results of this study demonstrate that rapid and reliable estimation of earthquake source parameters can be obtained from GPS velocity data. These parameters could be used for early earthquake warning and shake map construction, because such GPS velocity records can be obtained in real time.

关键词： high-rate GPS velometer GPS velocity determination CAP method earthquake source parameters sparse network

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