青藏块体东北缘近期地壳水平运动与应变积累
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摘要
利用青藏块体东北缘2001—2004年、2004—2007年GPS水平运动速度场结果,借助负位错模型,研究该区当前的地壳水平运动特征与应变积累状况。分析表明:经昆仑山、玉门、民乐地震后一段时间的调整,2004—2007年青藏块体东北缘总体反映与长期背景场一致的应变场重构特性。祁连山断裂带东段应变大体维持2001—2004年的积累背景;祁连山断裂带中—西段、庄浪河断裂南段及甘南地块、河西走廊较2001—2004年应变积累有所增强;阿尼玛卿断裂带东段、秦岭北麓断裂存在应变积累趋势。
By use of horizontal velocity data observed by GPS during 2001—2004 and 2004—2007 in the northeastern margin of Qinghai-Tibet block,aided by the negative dislocation model,the characteristics of horizontal crustal movement and the status of strain accumulation of this area are researched and following conclusion are drawn.During the period of 2004—2007,the regional stress field,after the adjustment through the Kunlun Mountains,Yumen and Minle earthquakes,entirely reflects re-constructing features in accordance with its long-term background field.The eastern segment of Qilian Mountain fault zone roughly maintains the accumulating background of 2001—2004,there appears strengthening in the middle-western segment of Qilian Mountain fracture zone,the southern segment of Zhuanglanghe fault and block of southern Gansu and Hexi corridor relative to 2001—2004;the eastern segment of Animaqing fracture zone,the northern foot fault of Qinling Range also present the features of stress-strain accumulation.
By use of horizontal velocity data observed by GPS during 2001—2004 and 2004—2007 in the northeastern margin of Qinghai-Tibet block,aided by the negative dislocation model,the characteristics of horizontal crustal movement and the status of strain accumulation of this area are researched and following conclusion are drawn.During the period of 2004—2007,the regional stress field,after the adjustment through the Kunlun Mountains,Yumen and Minle earthquakes,entirely reflects re-constructing features in accordance with its long-term background field.The eastern segment of Qilian Mountain fault zone roughly maintains the accumulating background of 2001—2004,there appears strengthening in the middle-western segment of Qilian Mountain fracture zone,the southern segment of Zhuanglanghe fault and block of southern Gansu and Hexi corridor relative to 2001—2004;the eastern segment of Animaqing fracture zone,the northern foot fault of Qinling Range also present the features of stress-strain accumulation.
引文
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9张希,等.用最小二乘配置获得地形变应变场动态图像的几个问题研究[J].地壳形变与地震,1999,19(3):32-39.9Zhang Xi,et al.Study on some questions of dynamic pic-tures of crustal deformation and strain fields obtained by the least square collocation[J].Crustal Deformation and Earth-quake,1999,19(3):32-39.(in Chinese)
10江在森,等.昆仑山口西Ms8.1地震前区域构造变形背景[J].中国科学(D辑),2003,33(增刊):163-172.10Jiang Zaisen,et al.The regional tectonic deformation back-ground before theMs8.1earthquake in the west of KunlunMountain Pass[J].China Science(D seris),2003,33(Sup.):163-172.(in Chinese)
11Matsu’ura M,et al.Dislocation model for aseismic crustal deformation at Hollister,California[J].J.of Geophysical Research,1986,91(B12):12661-12674.
12Okada Y.Surface deformation due to shear and tensile faults in a half-space[J].Bulletin of the Seismological Society of America,1985,75(4):1135-1154.
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):620-629.13Zhang Xi,et al.Inversion for negative dislocation on elastic block boundaries in the northeastern margin of Qinghai-Ti-bet block and prediction for strong earthquake location[J].Acta Seismologica Sinica,2005,18(6):666-677.(in Chinese)
2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):374-381.2Zhang Xi,et al.Aseismic negative dislocation model and de-formation analysis of crustal horizontal movement during1999-2001in the northeast margin of Qinghai-Tibet block[J].Acta Seismologica Sinica,2003,16(4):395-403.
3王庆良,等.青藏块体东北缘现今的地壳运动[J].大地测量与地球动力学,2002,22(4):12-16.3Wang Qingliang,et al.Present-day crustal movement ofnortheastern margin of Qinghai-Tibet block[J].Journal of Geodesy and Geodynamics,2002,22(4):12-16.(in Chi-nese)
4薄万举,张祖胜,郭良迁.昆仑山口大地震与地形变异常的讨论[J].大地测量与地球动力学,2003,23(1):22-28.4Bo Wanju,Zhang Zusheng and Guo Liangqian.Discussion of Kunlun Moutain large earthquake and related anomalles of crustal deformation[J].Journal of Geodesy and Geodynam-ics,2003,23(1):22-28.(in Chinese)
5王双绪,等.昆仑8.1级地震前青藏块体东北缘构造运动特征[J].大地测量与地球动力学,2004,24(1):50-55.5Wang Shuangxu,et al.Features of horizontal movement in northeast margin of Qinghai-Tibet block beforeMs8.1Kun-lun earthquake[J].Journal of Geodesy and Geodynamics,2004,24(1):50-55.(in Chinese)
6张晓亮,等.昆仑山口西Ms8.1地震形变场的模拟分析[J].大地测量与地球动力学,2007,27(2):16-21.6Zhang Xiaoliang,et al.Simulation and analysis of coseismic deformation field ofMs8.1earthquake in west to Kunlun Mountain Pass[J].Journal of Geodesy and Geodynamics,2007,22(2):16-21.(in Chinese)
7张希,等.民乐-山丹地震的区域构造变形背景与中短期前兆[J].中国地震,2004,20(3):238-246.7Zhang Xi,et al.Regional tectonic background and medium-and short-term precursors to the Minle-Shandan earth-quakes[J].Earthquake Research in China,2005,19(1):12-21.
8张希,等.西北地区近期地壳水平运动与构造变形特征[J].中国地震,2006,22(1):43～55.8Zhang Xi,et al.Characteristics of recent horizontal crustal movement and tectonic deformation in the northwest China region[J].Earthquake Research in China,2006,20(3):262-270.(in Chinese)
9张希,等.用最小二乘配置获得地形变应变场动态图像的几个问题研究[J].地壳形变与地震,1999,19(3):32-39.9Zhang Xi,et al.Study on some questions of dynamic pic-tures of crustal deformation and strain fields obtained by the least square collocation[J].Crustal Deformation and Earth-quake,1999,19(3):32-39.(in Chinese)
10江在森,等.昆仑山口西Ms8.1地震前区域构造变形背景[J].中国科学(D辑),2003,33(增刊):163-172.10Jiang Zaisen,et al.The regional tectonic deformation back-ground before theMs8.1earthquake in the west of KunlunMountain Pass[J].China Science(D seris),2003,33(Sup.):163-172.(in Chinese)
11Matsu’ura M,et al.Dislocation model for aseismic crustal deformation at Hollister,California[J].J.of Geophysical Research,1986,91(B12):12661-12674.
12Okada Y.Surface deformation due to shear and tensile faults in a half-space[J].Bulletin of the Seismological Society of America,1985,75(4):1135-1154.
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):620-629.13Zhang Xi,et al.Inversion for negative dislocation on elastic block boundaries in the northeastern margin of Qinghai-Ti-bet block and prediction for strong earthquake location[J].Acta Seismologica Sinica,2005,18(6):666-677.(in Chinese)
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