青藏高原均衡重力异常的地震构造动力学研究
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摘要
根据Airy-Hesikannen均衡假说,以CRUST2.0模型提供的密度和Moho面深度作为计算参数,计算得到青藏高原的均衡重力异常,并结合地震资料从均衡的角度对青藏高原的地震构造动力学进行了解释。研究表明,强震往往发生在均衡重力异常梯度带等值线的斜坡带、陡变带以及拐弯区上,说明地壳构造与地震的发生有一定的关系。
On the basis of the Airy-Hesikannen equilibrium hypothesis,the isostatic gravity anomalies of Qinghai-Tibet plateau are calculated taking the density and the depth of upper lithosphere from the CRUST2.0 model as parameters,and then the seismo-tectonic dynamics is studied by use of the seismic data from the point of equilibrium.It shows that strong earthquakes occur often in the inflexion of gradient belt of isostatic gravity anomalies,and generally,the occurrence of earthquake is correlated to crust tectonics.
On the basis of the Airy-Hesikannen equilibrium hypothesis,the isostatic gravity anomalies of Qinghai-Tibet plateau are calculated taking the density and the depth of upper lithosphere from the CRUST2.0 model as parameters,and then the seismo-tectonic dynamics is studied by use of the seismic data from the point of equilibrium.It shows that strong earthquakes occur often in the inflexion of gradient belt of isostatic gravity anomalies,and generally,the occurrence of earthquake is correlated to crust tectonics.
引文
1袁果田,张勇军.青藏高原均衡重力异常研究[J].地壳形变与地震,1997,17(1):76~80.1 Yuan Guotian and Zhang Yongjun.Discussion on isostaticgravity anomaly in Qinghai-Tibet plateau[J].Crustal De-formation and Earthquake,1997,17(1):76-80.(in Chi-nese)
2董瑞树,冉洪流.青藏高原周缘地区大地震发生的地球物理条件的新认识[J].山西地震,2003,4:40~42.2 Dong Ruishu and Ran Hongliu.A new viewpoint about geo-physical condition for strong earthquake occurrence in pe-riphery of Qinghai-Tibet plateau[J].Earthquake Research inShanxi,2003,4:40-42.(in Chinese)
3李姗姗,吴小平,李建伟.基于Airy-Hesikannen均衡模型的莫霍面反演[J].测绘科学,2004,29(2):25~27.3 Li Shanshan,Wu Xiaoping and Li Jianwei.Inverse of themohorovicic’s surface based on airy-hesikannen’s isstaticmodel[J].Science of Surveying and Mapping,2004,29(2):25-27.(in Chinese)
4李志远.均衡理论及其在大地测量学中的应用[D].武汉:武汉大学,2007.4 Li Zhiyuan.Isostatic equilibrium and its application in geod-esy[D].Wuhan:Wuhan University,2007.(in Chinese)
5 Heiskanen W A and Moritz H.Physical Geodesy[M].San-Francisco:Freeman,1967.
6张赤军,方剑,马宗晋.均衡异常与现代构造应力场的初步研究——以东海及其东缘海为例[J].地震学报,2003,25(1):32~39.6 Zhang Chijun,Fang Jian and Ma Zongjin.Preliminary studyon isostatic anomaly and recent tectonic stress field———tak-ing east sea and its eastern boundary seas as example[J].Acta Seismologica Sinica,2003,25(1):32-39.(in Chi-nese)
7奉大勇.均衡改正与均衡重力异常解释问题讨论[J].物探化探计算技术,1991,13(3):246~248.7 Feng Dayong.A discussion on the probelem of isostatic cor-rection and interpretation of isostatic gravity anomaly[J].Computing Techniques for Geophysical and Geochemical Ee-ploration,1991,13(3):246-248.(in Chinese)
8张赤军,方剑.台湾及其邻海的重力特征与构造、地震的关系[J].台湾海峡,2001,20(1):101~108.8 Zhang ChiJun and Fang Jian.Relation between gravity fieldfeature and tectonics and earthquake in Taiwan and its adja-cent regions[J].Journal of Oceanography in Taiwan Strait,2001,20(1):101-108.
2董瑞树,冉洪流.青藏高原周缘地区大地震发生的地球物理条件的新认识[J].山西地震,2003,4:40~42.2 Dong Ruishu and Ran Hongliu.A new viewpoint about geo-physical condition for strong earthquake occurrence in pe-riphery of Qinghai-Tibet plateau[J].Earthquake Research inShanxi,2003,4:40-42.(in Chinese)
3李姗姗,吴小平,李建伟.基于Airy-Hesikannen均衡模型的莫霍面反演[J].测绘科学,2004,29(2):25~27.3 Li Shanshan,Wu Xiaoping and Li Jianwei.Inverse of themohorovicic’s surface based on airy-hesikannen’s isstaticmodel[J].Science of Surveying and Mapping,2004,29(2):25-27.(in Chinese)
4李志远.均衡理论及其在大地测量学中的应用[D].武汉:武汉大学,2007.4 Li Zhiyuan.Isostatic equilibrium and its application in geod-esy[D].Wuhan:Wuhan University,2007.(in Chinese)
5 Heiskanen W A and Moritz H.Physical Geodesy[M].San-Francisco:Freeman,1967.
6张赤军,方剑,马宗晋.均衡异常与现代构造应力场的初步研究——以东海及其东缘海为例[J].地震学报,2003,25(1):32~39.6 Zhang Chijun,Fang Jian and Ma Zongjin.Preliminary studyon isostatic anomaly and recent tectonic stress field———tak-ing east sea and its eastern boundary seas as example[J].Acta Seismologica Sinica,2003,25(1):32-39.(in Chi-nese)
7奉大勇.均衡改正与均衡重力异常解释问题讨论[J].物探化探计算技术,1991,13(3):246~248.7 Feng Dayong.A discussion on the probelem of isostatic cor-rection and interpretation of isostatic gravity anomaly[J].Computing Techniques for Geophysical and Geochemical Ee-ploration,1991,13(3):246-248.(in Chinese)
8张赤军,方剑.台湾及其邻海的重力特征与构造、地震的关系[J].台湾海峡,2001,20(1):101~108.8 Zhang ChiJun and Fang Jian.Relation between gravity fieldfeature and tectonics and earthquake in Taiwan and its adja-cent regions[J].Journal of Oceanography in Taiwan Strait,2001,20(1):101-108.
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