玉树M_S 7.1级地震前的形变应变场变化特征
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摘要
基于1999～2007年和2007～2009年的GPS站点观测数据计算的速度场,分析了青藏亚板块的运动特征.利用块体(旋转与线性应变)弹性运动公式计算可可西里—巴颜喀拉块体和羌唐块体的应变率、可可西里—玉树断裂带的运动速度和应变率,研究了玉树7.1级地震前的形变应变特征.结果表明:可可西里—巴颜喀拉块体处于青藏亚板块运动场的差异变化较大的地带;1999～2007年可可西里—玉树断裂带左旋走滑运动为主;2007～2009年可可西里—玉树断裂带在玉树以西压应变率显著增强,利于应力积累,以东为右旋为主,玉树附近地段成为不同应变应力状态的转换地带——不稳定地段.可可西里—玉树断裂带的活动为7.1级地震孕育提供了能量积累和发震条件.
Base on the velocity field calculated from the GPS data from 1999 to 2007 and from 2007 to 2009,the movement characteristics of Qinghai-Tibet subplates were studied.The strain rate of Hoh Xil-Bayan Har block and the Qiangtang block,the velocity and the strain rate of Hoh Xil-Yushu fault zone were calculated by the block(rotation and linear stain)elastic movement formula.The deformation strain before M_S7.1 Yushu earthquake has been studied.The result shows that between 1999 and 2007 the activity in Yushu fault zone was mostly left-lateral strike slip.Between 2007 and 2009,the strain rate of Hoh Xil-Yushu fault zone in the western part of Yushu has increased remarkably,which is favorable to stress accumulation.The Hoh Xil-Yushu fault zone in the eastern part of Yushu showed mainly right-lateral strike slip activity.Yushu was a transitional area between different kinds of active strain and became an unstable zone.The activity in Hoh Xil-Yushu fault zone became a condition of the M_S7.1 earthquake,in the meantime,accumulated energy for the earthquake.
Base on the velocity field calculated from the GPS data from 1999 to 2007 and from 2007 to 2009,the movement characteristics of Qinghai-Tibet subplates were studied.The strain rate of Hoh Xil-Bayan Har block and the Qiangtang block,the velocity and the strain rate of Hoh Xil-Yushu fault zone were calculated by the block(rotation and linear stain)elastic movement formula.The deformation strain before M_S7.1 Yushu earthquake has been studied.The result shows that between 1999 and 2007 the activity in Yushu fault zone was mostly left-lateral strike slip.Between 2007 and 2009,the strain rate of Hoh Xil-Yushu fault zone in the western part of Yushu has increased remarkably,which is favorable to stress accumulation.The Hoh Xil-Yushu fault zone in the eastern part of Yushu showed mainly right-lateral strike slip activity.Yushu was a transitional area between different kinds of active strain and became an unstable zone.The activity in Hoh Xil-Yushu fault zone became a condition of the M_S7.1 earthquake,in the meantime,accumulated energy for the earthquake.
引文
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[10] http://www.csi.ac.cn/manage/html/4028861611cSc2ba0111c5c558b00001/_content/10_04/17/1271488288058,html:陈运泰研究小组:2010年4月14日青海玉树地震震源机制和破裂过程快报(第四版)http://www,csi.ac.cn/manage/html/4028861611c5c2ba0111-c5c558b00001/_ content/10 _ 04/17/1271488288058． html:Chen Yuntai research team:The express of earthquake focal mechanism and rupture process of the earthquake Yushu in Qinghai Province 2010-4-14 (The fourth edition)
[11] 郭良迁,占伟,杨国华等.山西断陷带的近期位移和应变特征.大地测量与地球动力学,2010,30(4) :36～42 Guo L Q,Zhan W,Yang G H,et al.Short-term displacement and characteristics of strain rate of Shanxi fault subsidence zone.Journal of Geodesy and Geodynamics,2010,30(4) :36～42
[2] 马宏生,张国民,刘杰等.中国大陆及其邻近地区强震活动与活动地块关系研究.地学前缘,2003,10(S1) :74～80 Ma H S,Zhang G M,Liu J,et al.Correlation between strong earthquake activity and active crustal block in China mainland and its adjacent regions.Earth Science Frontiers (in Chinese),2003,10(S1) :74～80
[3] 郭良迁,张祖胜,李延兴等.昆仑山口西Ms=8． 1级地震的形变应变场研究.地球物理学报,2004,47(6) :1068～1075 GuoLQ,ZhangZS,Li YX,et al.A study on the strain field associated with the Ms= 8． 1 Kunlunshan earthquake.Chinese J.Geophys.(in Chinese) ,2004,47(6) :1068～1075
[4] 石峰,何宏林,张英.青海玉树Ms7． 1级地震地表破裂带的遥感影像解译.震灾防御技术,2010,5(2) :220～226 Shi F,He H L,Zhang Y.Remote sensing interpretation of the Ms7． 1 Yushu earthquake surface ruptures.Technology for Earthquake Disaster Prevention (in Chinese),2010,5(2) :220～226
[5] 张桂芳,屈春燕,单新建等.2010年青海玉树Ms7． 1级地震地表破裂带和形变特征分析.地球物理学报,2011,54(1) :121～127 Zhang G F,Qu C Y,Shan X J,et al.The surface rupture and coseismic deformation characteristics of the Ms7． 1 earthquake at Qinghai Yushu in 2010． Chinese J.Geophys.(in Chinese),2011,54(1) :121～127
[6] 李延兴,张静华,何建坤等.由空间大地测量得到的太平洋板块现今构造运动与板内形变应变场.地球物理学报,2007,50(2) :437～447 Li Y X,Zhang J H,He J K,et al.Current day tectonic motion and intraplate deformation-strain field obtained from space geodesy in the Pacific Plate.Chinese J.Geophys.(in Chinese),2007,50(2) :437～447
[7] 郭良迁,李延兴,胡新康等.中国大陆地壳运动与汶川Ms8． 0级地震孕育的关系.地球物理学报,2009,52(2) :531～537 Guo L Q,Li Y X,Hu X K,et al.Crustal motion of Chinese mainland and preparation of Ms8． 0 Wenchuan earthquake in Sichuan Province.Chinese J.Geophys.(in Chinese),2009,52(2) :531～537
[8] 毕令斯M P著.构造地质学.张炳熹译.北京:地质出版社,1973 Billings M P.Structural Geology (in Chinese).Zhang B X Translated.Beijing:Geological Publishing House,1973
[9] 徐锡伟,闻学泽,叶建青等.汶川M,8． 0地震地表破裂带及其发震构造.地震地质,2008,30(3) :597～629 Xu X W,Wen X Z,Ye J Q,et a1． The Ms8． 0 Wemchuan earthqu.akesurface ruptures and its seismogenic structure.Seisrnolog.ynnd Geology(in C1irnese),2008,30(3) :597～629
[10] http://www.csi.ac.cn/manage/html/4028861611cSc2ba0111c5c558b00001/_content/10_04/17/1271488288058,html:陈运泰研究小组:2010年4月14日青海玉树地震震源机制和破裂过程快报(第四版)http://www,csi.ac.cn/manage/html/4028861611c5c2ba0111-c5c558b00001/_ content/10 _ 04/17/1271488288058． html:Chen Yuntai research team:The express of earthquake focal mechanism and rupture process of the earthquake Yushu in Qinghai Province 2010-4-14 (The fourth edition)
[11] 郭良迁,占伟,杨国华等.山西断陷带的近期位移和应变特征.大地测量与地球动力学,2010,30(4) :36～42 Guo L Q,Zhan W,Yang G H,et al.Short-term displacement and characteristics of strain rate of Shanxi fault subsidence zone.Journal of Geodesy and Geodynamics,2010,30(4) :36～42
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