四川及邻区GPS观测揭示的应变积累与大震影响分析
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摘要
利用2009—2010年四川及其邻区GPS水平运动速度场资料,参考2004—2007年、2007—2008年相应结果,借助形变应变场分析与非震负位错反演,研究活动断裂带近期应变积累特性、分区分段差异性,以及汶川、玉树大震影响和演变情况。结果表明:1)汶川大震影响大幅减弱但未完全结束,尤其龙门山断裂区及其南北两端附近;2)玉树地震对监测区影响偏弱;3)鄂尔多斯西南缘及甘青川-甘川-甘川陕交界区、川滇交界东部、滇西北至川滇交界目前具备、维持强震孕育背景。
Using horizontal velocity data observed by GPS in 2009-2010 in Sichuan and its nearby areas,referring to relevant results in 2004-2007 and 2007-2008,with the aid of analysis of deformation-stain field and inversion of negative dislocation,the features of recent strain accumulation of active faults and their difference between different regions and different segments and together with the evolution of influence from the Wenchuan and Yushu earthquakes are researched.The results are as follows.1)Influence from the Wechuan earthquake decreased obviously but had not ended,at the Longmenshan fault and its two ends especially.2)Weaker influence from the Yushu earthquake was observed.3)At present,these regions had background of strong earthquakes,i.s.,the southwestern margin of Ordos,boundary of Gansu-Qinghai-Sichuan and Gansu-Sichuan and Gansu-Sichuan-Shannxi,eastern boundary between Sichuan and Yunnan,from the northwestsen Yunnan to the boundary between Sichuan and Yunnan.
Using horizontal velocity data observed by GPS in 2009-2010 in Sichuan and its nearby areas,referring to relevant results in 2004-2007 and 2007-2008,with the aid of analysis of deformation-stain field and inversion of negative dislocation,the features of recent strain accumulation of active faults and their difference between different regions and different segments and together with the evolution of influence from the Wenchuan and Yushu earthquakes are researched.The results are as follows.1)Influence from the Wechuan earthquake decreased obviously but had not ended,at the Longmenshan fault and its two ends especially.2)Weaker influence from the Yushu earthquake was observed.3)At present,these regions had background of strong earthquakes,i.s.,the southwestern margin of Ordos,boundary of Gansu-Qinghai-Sichuan and Gansu-Sichuan and Gansu-Sichuan-Shannxi,eastern boundary between Sichuan and Yunnan,from the northwestsen Yunnan to the boundary between Sichuan and Yunnan.
引文
1中国地震局监测预报司.汶川8.0级地震科学研究报告[M].北京:地震出版社,2008.(Department of Monitoring and Prediction of China Earthquake Administration.Science and research report on the Wenchuan 8.0 earthquake[M].Beijing:Seismology Press,2008)
2张希,等.地形变观测揭示的汶川Ms8.0级地震同震响应与影响[J].武汉大学学报(信息科学版),2009,34(10):1 204-1 209.(Zhang Xi,et al.Coseismic response and influence of the Wenchuan Ms8.0 earthquake revealed by crustal deformation observation[J].Geomatics and Infor-mation Science of Wuhan University,2009,34(10):1 204-1 209)
3张希,等.昆仑山与汶川强烈地震对青藏块体东北缘地壳运动及应变积累的影响[J].地球学报,2010,31(1):32-42.(Zhang Xi,et al.The influence of the Kulun Mountain and Wenchuan strong earthquakes on the crustal movement and strain accumulation in the northeastern margin of Qing-hai-Xizang block[J].Acta Geoscientica Sinica,2010,31(1):32-42)
4张希,等.利用GPS资料分析汶川地震前后川滇及其邻区水平运动及应变积累[J].地震研究,2008,31(增刊):464-470.(Zhang Xi,et al.Analysis on horizontal move-ment and strain accumulation in Sichuan-Yunnan and their nearby before and after the Wenchuan earthquake using GPS data[J].Journal of Seismological Research,2008,31(Supp.):464-470)
5张希,江在森.南北地震带中南段地壳水平运动负位错反演与汶川等地震背景[J].西北地震学报,2010,32(2):105-111.(Zhang Xi and Jiang Zaisen.Inversion of nega-tive dislocation for crustal horizontal movement in middle-southern segment of the China south-north seismic belt[J].Northwestern Seismological Journal,2010,32(20:105-111)
6张希,江在森.对华北GPS监测区近期地壳应变连续分布的估计[J].地震学刊,1999,75(2):58-62.(Zhang Xi and Jiang Zaisen.Estimation for continuous distribution of recent crsutal strain in GPS monitoring area of north China[J].Journal of Seismology,1999,75(2):58-62)
7江在森,等.GPS初步结果揭示的中国大陆水平应变场与构造变形[J].地球物理学报,2003,46(3):352-358.(Jiang Zaisen,et al.Horizontal strain filed and tectonic de-formation of China Mainland revealed by preliminary GPS re-sult[J].Chinese Journal of Geophysics,2003,46(3):352-358)
8 Matsu’ura M,Jackson D D and Cheng A.Dislocation model for aseismic crustal deformation at Hollister,California[J].J of Geophysical Research.,1986,91(B12):12 661-12 674.
9 Okada Y.Surface deformation due to shear and tensile faults in a half-space[J].Bulletin of the Seismological Society of America,1985,75(4):1 135-1 154.
10伍吉仓,陈永奇.一种板块边界断层运动的力学模型[J].地壳形变与地震,2000,20(2):8-14.(Wu Jicang and Chen Yongqi.A physical model for fault movement a-long plate boundary[J].Crustal Deformation and Earth-quake,2000,20(2):8-14)
11何玉梅,姚振兴.中国台湾南部及其周边岛屿现今地壳形变的位错模型[J].地球物理学报,2002,45(5):638-645.(He Yumei and Yao Zhenxing.Dislocation model for current crustal deformation in and around southern Taiwan,China[J].Chinese Journal of Geophysics,2002,45(2):638-645)
12张希,等.1999—2001年青藏块体东北缘地壳水平运动的非震反位错模型及变形分析[J].地震学报,2003,25(4):374-381.(Zhang Xi,et al.Aseismic negative dislo-cation model and deformation analysis of crustal horizontal movement during 1999—2001 in the northeast margin of Qinghai-Xizang block[J].Acta Seismologica Sinica,2003,25(4):638-645)
13张希,等.青藏块体东北缘弹性块体边界负位错反演与强震地点预测[J].地震学报,2005,27(6):620-629.(Zhang Xi,et al.Inversion for negative dislocation on elas-tic block boundaries along the northeastern margin of Qing-hai-Xizang block and prediction for strong earthquake loca-tion[J].Acta Seismologica Sinica,2005,18(6):666-677)
14张希,等.川滇地区地壳水平运动的弹性块体边界负位错模型与强震地点预测[J].地震研究,2005,28(2):119-124.(Zhang Xi,et al.Negative dislocation model of e-lastic block boundary of horizontal crustal movement and the prediction of strong earthquake position[J].Journal of Seismological Research,2005,28(2):119-124)
15江在森,等.青藏块体东北缘近期水平运动与变形[J].地球物理学报,2001,44(5):636-644.(Jiang Zaisen,et al.Recent horizontal movement and deformation in the northeast margin of Qinghai-Tibet block[J].Chinese Jour-nal of Geophysics,2001,44(5):636-644)
2张希,等.地形变观测揭示的汶川Ms8.0级地震同震响应与影响[J].武汉大学学报(信息科学版),2009,34(10):1 204-1 209.(Zhang Xi,et al.Coseismic response and influence of the Wenchuan Ms8.0 earthquake revealed by crustal deformation observation[J].Geomatics and Infor-mation Science of Wuhan University,2009,34(10):1 204-1 209)
3张希,等.昆仑山与汶川强烈地震对青藏块体东北缘地壳运动及应变积累的影响[J].地球学报,2010,31(1):32-42.(Zhang Xi,et al.The influence of the Kulun Mountain and Wenchuan strong earthquakes on the crustal movement and strain accumulation in the northeastern margin of Qing-hai-Xizang block[J].Acta Geoscientica Sinica,2010,31(1):32-42)
4张希,等.利用GPS资料分析汶川地震前后川滇及其邻区水平运动及应变积累[J].地震研究,2008,31(增刊):464-470.(Zhang Xi,et al.Analysis on horizontal move-ment and strain accumulation in Sichuan-Yunnan and their nearby before and after the Wenchuan earthquake using GPS data[J].Journal of Seismological Research,2008,31(Supp.):464-470)
5张希,江在森.南北地震带中南段地壳水平运动负位错反演与汶川等地震背景[J].西北地震学报,2010,32(2):105-111.(Zhang Xi and Jiang Zaisen.Inversion of nega-tive dislocation for crustal horizontal movement in middle-southern segment of the China south-north seismic belt[J].Northwestern Seismological Journal,2010,32(20:105-111)
6张希,江在森.对华北GPS监测区近期地壳应变连续分布的估计[J].地震学刊,1999,75(2):58-62.(Zhang Xi and Jiang Zaisen.Estimation for continuous distribution of recent crsutal strain in GPS monitoring area of north China[J].Journal of Seismology,1999,75(2):58-62)
7江在森,等.GPS初步结果揭示的中国大陆水平应变场与构造变形[J].地球物理学报,2003,46(3):352-358.(Jiang Zaisen,et al.Horizontal strain filed and tectonic de-formation of China Mainland revealed by preliminary GPS re-sult[J].Chinese Journal of Geophysics,2003,46(3):352-358)
8 Matsu’ura M,Jackson D D and Cheng A.Dislocation model for aseismic crustal deformation at Hollister,California[J].J of Geophysical Research.,1986,91(B12):12 661-12 674.
9 Okada Y.Surface deformation due to shear and tensile faults in a half-space[J].Bulletin of the Seismological Society of America,1985,75(4):1 135-1 154.
10伍吉仓,陈永奇.一种板块边界断层运动的力学模型[J].地壳形变与地震,2000,20(2):8-14.(Wu Jicang and Chen Yongqi.A physical model for fault movement a-long plate boundary[J].Crustal Deformation and Earth-quake,2000,20(2):8-14)
11何玉梅,姚振兴.中国台湾南部及其周边岛屿现今地壳形变的位错模型[J].地球物理学报,2002,45(5):638-645.(He Yumei and Yao Zhenxing.Dislocation model for current crustal deformation in and around southern Taiwan,China[J].Chinese Journal of Geophysics,2002,45(2):638-645)
12张希,等.1999—2001年青藏块体东北缘地壳水平运动的非震反位错模型及变形分析[J].地震学报,2003,25(4):374-381.(Zhang Xi,et al.Aseismic negative dislo-cation model and deformation analysis of crustal horizontal movement during 1999—2001 in the northeast margin of Qinghai-Xizang block[J].Acta Seismologica Sinica,2003,25(4):638-645)
13张希,等.青藏块体东北缘弹性块体边界负位错反演与强震地点预测[J].地震学报,2005,27(6):620-629.(Zhang Xi,et al.Inversion for negative dislocation on elas-tic block boundaries along the northeastern margin of Qing-hai-Xizang block and prediction for strong earthquake loca-tion[J].Acta Seismologica Sinica,2005,18(6):666-677)
14张希,等.川滇地区地壳水平运动的弹性块体边界负位错模型与强震地点预测[J].地震研究,2005,28(2):119-124.(Zhang Xi,et al.Negative dislocation model of e-lastic block boundary of horizontal crustal movement and the prediction of strong earthquake position[J].Journal of Seismological Research,2005,28(2):119-124)
15江在森,等.青藏块体东北缘近期水平运动与变形[J].地球物理学报,2001,44(5):636-644.(Jiang Zaisen,et al.Recent horizontal movement and deformation in the northeast margin of Qinghai-Tibet block[J].Chinese Jour-nal of Geophysics,2001,44(5):636-644)
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