利用地震矩张量与GPS资料推算中国大陆现今地壳运动能量分布特征
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摘要
在一次地震轮回时间段内,对于某个相对统一和完整的体系,应变能的积累与释放基本等量。地震资料得到的地壳变形场是现今地壳应变能已得到释放后的一种表现,而GPS资料得到的地壳变形场中则既包含地壳应变能量的释放量,也包含积累量。结合中国大陆及其邻区的地质构造与活动地块分布特点,将研究区划分为32个独立的分区。在此基础之上,利用地震和GPS资料分别计算得到了两组单位体积能量积累率,并对其进行了比较分析。研究表明,本次地震轮回中大多数区域的地壳应变能量已基本释放完毕,我国境内只有青藏北部、川滇、昆仑、阿尔金等几个地区的地壳应变能量积累偏高,仍具有发生较强地震的可能性,是今后地震预测研究应该重点关注的地区。
For a relatively unified and integrated system,the acumulated energy and released energy are basically equal in a cycle of earthquake activity.The crustal deformation fields inferred from earthquake data represent the results of strain energy that had been released.On the other hand,the deformation fields inferred from GPS data represent the strain energy summation of accumulated energy and released energy.According to the geotectonic and active blocks distribution characteristics in China continent and its neighborhood,32 subregions are subdivided.On this basis,two groups of unit volume energy accumulated rate are calculated and compared with each other in this paper.It can be concluded that crustal strain energy of most areas in our research are released ultimately.Only in the North Tibet,Sichan-Yunnan,Kunlun and Altyn areas,the probability of strong earthquakes is greater.More attention should be paid to these areas.
For a relatively unified and integrated system,the acumulated energy and released energy are basically equal in a cycle of earthquake activity.The crustal deformation fields inferred from earthquake data represent the results of strain energy that had been released.On the other hand,the deformation fields inferred from GPS data represent the strain energy summation of accumulated energy and released energy.According to the geotectonic and active blocks distribution characteristics in China continent and its neighborhood,32 subregions are subdivided.On this basis,two groups of unit volume energy accumulated rate are calculated and compared with each other in this paper.It can be concluded that crustal strain energy of most areas in our research are released ultimately.Only in the North Tibet,Sichan-Yunnan,Kunlun and Altyn areas,the probability of strong earthquakes is greater.More attention should be paid to these areas.
引文
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Jing Yan,Ren Jinwei,Wang Hui.2005.Tectonic deformation of China continent and its adjacent regions since Late Pleistocene inferred from active fault movement data[J].Journal of Seismological Research,28(4):353-358.(in Chinese with abstract)
Ma H ongsheng,Zhang Guomin,Liu Jie,et al.2003.Correlation between strong earthquake activity and active crustal-block in China mainland and its adjacent regions[J].Earth Science Frontiers,10(suppl):74-80.(in Chinese with abstract)
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Yang Shaomin.2002.Master Thesis.Bi-Cubic Spline Methods and Crustal Tectonic Deformation Fields of China[D].Wuhan:Institute of Seisimology,CEA.(in Chinese with abstract)
Yang Shaomin,Wang Qi,You Xinzhao.2005.Numerical analysis of contemporary horizontal tectonic Deformation fields in China from GPS data[J].Acta Seismologica Sinca,27(2):128-138.(in Chinese with abstract)
荆燕,任金卫.2004.利用活断层资料模拟中国大陆及其邻区晚第四纪地壳变形场[J].地震地质,26(1):71-90.
荆燕,任金卫,王辉.2005.由活断层运动资料计算分析中国大陆及其邻区晚更新世以来构造应变特征[J].地震研究,28(4):353-358.
马宏生,张国民,刘杰,等.2003.中国大陆及其邻区强震活动与活动地块关系研究[J].地学前缘,10(suppl):74-80.
吴云,孙建中,周硕愚.1996.利用地震矩张量反演地壳运动水平速度场的理论和方法[J].地壳形变与地震,16(3):1-7.
杨少敏.2002.双三次样条函数拟合法和中国大陆构造形变场研究[D].武汉:中国地震局地震研究所.
杨少敏,王琪,游新兆.2005.中国现今地壳运动GPS速度场的连续变形分析[J].地震学报,27(2):128-138.
Hain es A J,Holt W E,1993.A procedure to obtain the complete horizontal motion within zones of distributed deformation from the inversion of strain rate data[J].J.Geophys.Res.,98(B7):12057-12082
Holt W E,Chamot-Rooke N,Pichon Le,et al.2000.Velocity field in Asia inferred from Quaternary fault slip rates and Global Positioning System observation[J].J.Geophy.Res.,105(B8):19185-19209
Holt W E.1995.Flow fields within the Tonga slab determined from moment tensors of deep earthquakes[J].Geophysical Research Letters,22(8):989-992
Jing Yan and Ren Jinwei.2004.Late Quaternary crustal deformation field in China,s continent and its adjacent regions inferred from active fault data[J].Seismology and Geology,26(1):71-90.(in Chinese with abstract)
Jing Yan,Ren Jinwei,Wang Hui.2005.Tectonic deformation of China continent and its adjacent regions since Late Pleistocene inferred from active fault movement data[J].Journal of Seismological Research,28(4):353-358.(in Chinese with abstract)
Ma H ongsheng,Zhang Guomin,Liu Jie,et al.2003.Correlation between strong earthquake activity and active crustal-block in China mainland and its adjacent regions[J].Earth Science Frontiers,10(suppl):74-80.(in Chinese with abstract)
Wu Yu n,Sun Jianzhong,Zhou Shuoyu.1996.Theory and method of inversing horizontal velocity field of crustal movement by seismic moment tensor[J].Crustal Deformation and Earthquake,16(3):1-7.(in Chinese with abstract)
Yang Shaomin.2002.Master Thesis.Bi-Cubic Spline Methods and Crustal Tectonic Deformation Fields of China[D].Wuhan:Institute of Seisimology,CEA.(in Chinese with abstract)
Yang Shaomin,Wang Qi,You Xinzhao.2005.Numerical analysis of contemporary horizontal tectonic Deformation fields in China from GPS data[J].Acta Seismologica Sinca,27(2):128-138.(in Chinese with abstract)
荆燕,任金卫.2004.利用活断层资料模拟中国大陆及其邻区晚第四纪地壳变形场[J].地震地质,26(1):71-90.
荆燕,任金卫,王辉.2005.由活断层运动资料计算分析中国大陆及其邻区晚更新世以来构造应变特征[J].地震研究,28(4):353-358.
马宏生,张国民,刘杰,等.2003.中国大陆及其邻区强震活动与活动地块关系研究[J].地学前缘,10(suppl):74-80.
吴云,孙建中,周硕愚.1996.利用地震矩张量反演地壳运动水平速度场的理论和方法[J].地壳形变与地震,16(3):1-7.
杨少敏.2002.双三次样条函数拟合法和中国大陆构造形变场研究[D].武汉:中国地震局地震研究所.
杨少敏,王琪,游新兆.2005.中国现今地壳运动GPS速度场的连续变形分析[J].地震学报,27(2):128-138.
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