中国大陆主要块体现今运动状态联合反演研究
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摘要
基于中国大陆多年来的GPS速度数据和地震矩张量数据,在充分考虑大陆内部构造活动的基础上,联合反演研究了中国大陆主要块体的欧拉运动参数。将两种观测数据的相对权比同欧拉参数一同作为反演参数,利用联合反演模型和优化方法,合理地提取了观测数据中的块体运动信息。研究结果表明:(1)7个亚板块表现出复杂的运动和变形格局,以南北带为分界线,西部从南向北逐渐减弱,西藏亚板块中构造块体的欧拉矢量转速平均约为0.551°/Ma,新疆亚板块中各构造块体的欧拉矢量转速平均约为0.267°/Ma;南北带西部多数块体的运动明显大于东部,华北亚板块的欧拉矢量转速平均约为0.251°/Ma,华南亚板块约为0.283°/Ma。(2)中国大陆地壳的形变具有明显的整体形变趋势,同时亚板块或构造块体之间又表现出构造运动的区域性和差异性。(3)在联合反演中,GPS资料主要作用在于确定地壳运动的现时性,地震矩的作用主要是确定运动的趋势性。利用两种观测数据进行联合反演,可最大限度地提取块体运动的信息。
Based on the data of GPS and seismic moment tensor and considered tectonic motion within the Chinese continent thoroughly,the euler parameters of main-plates in Chinese continent are studied through joint inversion method.In this study,it is a good idea of inverting relative weight ratio as the inversion parameter with euler parameters together.Using joint inversion model and optimization method,movement information in the plates from observations are reasonably derived.The results reveal:(1)7 plates take on complicated pattern of movement and deformation,the movement and deformation are weakened gradually from south direction to north direction bordered by the South-North Zone,the euler vector rotate speeds in Tibet plates average about 0.551°/Ma,and 0.267°/Ma in Xinjiang plate.euler rotate speed of the plates in west area is bigger than that in east area of the South-North Zone,the one in north China sub-plates averages about 0.251°/Ma,but the one in south China averages about 0.283°/Ma;(2)The crust deformation in Chinese continent has a trend of whole deformation,at the same time the regional nature and difference of tectonic movement between the sub-plates and tectonic plates are presented.(3)In the joint inversion study,the update status of crust movement mainly ascertained by GPS data,but the trend of the movement mainly ascertained by seismic moment tensor data.So the movement information of plates is derived by joint inversion method from two kinds of observations.
Based on the data of GPS and seismic moment tensor and considered tectonic motion within the Chinese continent thoroughly,the euler parameters of main-plates in Chinese continent are studied through joint inversion method.In this study,it is a good idea of inverting relative weight ratio as the inversion parameter with euler parameters together.Using joint inversion model and optimization method,movement information in the plates from observations are reasonably derived.The results reveal:(1)7 plates take on complicated pattern of movement and deformation,the movement and deformation are weakened gradually from south direction to north direction bordered by the South-North Zone,the euler vector rotate speeds in Tibet plates average about 0.551°/Ma,and 0.267°/Ma in Xinjiang plate.euler rotate speed of the plates in west area is bigger than that in east area of the South-North Zone,the one in north China sub-plates averages about 0.251°/Ma,but the one in south China averages about 0.283°/Ma;(2)The crust deformation in Chinese continent has a trend of whole deformation,at the same time the regional nature and difference of tectonic movement between the sub-plates and tectonic plates are presented.(3)In the joint inversion study,the update status of crust movement mainly ascertained by GPS data,but the trend of the movement mainly ascertained by seismic moment tensor data.So the movement information of plates is derived by joint inversion method from two kinds of observations.
引文
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[19]WU Yun,SUN Jian-zhong,ZHOU Suo-yu.The theo-ry and method inverted crustal movement velocity fieldsusing seismic moment tensor[M].The National ClimbPlan,Beijing:Seismological Press,2001.
[2]DING Guo-yu,LU Yan-chou.Present Movement of in-nerplate blocks(1:14 000 000)[M].Beijing:The Chi-nese mapping Press,1989:21.
[3]DING Guo-yu.Lithospheric Dynamics of China[M].Beijing:Seismological Press,1991.131~140;142~153;163~165.
[4]ZHANG Pei-zheng.The up to date tectonic change oflithosphere and earthquake calamity in China Continent[J].The fourthly epoch research,1999,5:404~413.
[5]FAN Jun-xi,MA Jin,DIAO Gui-ling,et al.Primarydiscuss about relation between movement on block andgroup-earthquake[J].Acta Geophysica Sinica,2001,23(5):514~522.
[6]ZHU Wen-yao,CHENG Zong-yi,WANG Xiao-ya,etal.The background fields of crustal movement in Chinacontinent[J].Chinese Science Bulletin,1999,44(14):1537~1539.
[7]XU Cai-jun,LIU Jing-nan et al.Preliminary study ofblock rotation in north China area using GPS measure-ments[J].Journal of Wuhan Technical University ofSurveying and Mapping.2000,25(1):74~78.
[8]ZHU Wen-yao,WANG Xiao-ya,CHENG Zong-yi,etal.The primary results of crustal movement on Qinghai-Tibet plateau by GPS techniques[J].Science in China(D),2000,30(4):394~400.
[9]ZHANG Qiang,ZHU Wen-yao.Original modeling forcrustal structure blocks motion of China[J].ChineseScience Bulletin.2000,45(9):967~974.
[10]LI Yan-xing,HUANG Cheng,HU Xin-kang,et al.The grid-elasticity model on blocks of innerplate andstrain status of the main-blocks in China Continent[J].Acta Geophysica Sinica,2001,23(6):565~572.
[11]Qi Wang,Pei-Zhen Zhang,Zhi-Jun Niu,et al.Pre-sent-day crustal movement and tectonic deformation inChina[J].Science in China(D),2001,31(7):529~536.(in Chinese)
[12]YANG Guo-hua,HAN Yue-ping,ZHANG Feng-lan.To confirm the difference movement cells and its activi-ty pattern in north China using GPS data[J].ActaGeophysica Sinica,2001,23(1):1~10.(in Chinese)
[13]XU Caijun,Jingnan LIU,Zhicai LI,Lixiang DONG.Analyze characteristic of Deformations in Qinghai-Tibetand its margins by inverting seismic moment tensors andGPS velocities[J].Geo-spatial Information Science,2000(3):54~60.
[14]Haines,A.J.,and W.E.Holt,A procedure for obtain-ing the complete horizontal motions within zones of dis-tributed deformation from the inversion of strain ratedata[J].J.Geophys.Res.,1998,12057~12082.
[15]Hu Jyr-Ching,Shui-Beih Yu,Jacques Angelier,et al.Active Deformation of Taiwan from GPS Measurementsand Numerical Simulations t[J].J Geophys Res,2001,106(B2),2265~2280.
[16]Qi Wang,Pei-Zhen Zhang,Jeffrey T.Freymueller,et al.Present-Day Crustal Deformation in China Constrained byGlobal Positioning System Measurements[J]Science,19October 2001,Volume 294,574~577.
[17]Holt.W.E.,and A.J.Haines.,Earthquake strainrates and instantaneous relative motions within centraland Eastern Asia[J].Geophys.J.Int.,1995,122:569~593.
[18]HONG Han-jing,WANG Yi-peng,SHEN Jun,et al.The average image and its dynamic meaning aboutcrustal movement on blocks in China Continent[J].The Theory And Application of Activity Rupture Re-search,1998(6):17~29.
[19]WU Yun,SUN Jian-zhong,ZHOU Suo-yu.The theo-ry and method inverted crustal movement velocity fieldsusing seismic moment tensor[M].The National ClimbPlan,Beijing:Seismological Press,2001.
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