青藏高原东北缘重力变化机理研究
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摘要
通过对青藏高原东北缘重力观测资料进行整体平差计算,系统分析了该区1993—2003年的重力场变化特征;发现其与活动断裂构造密切相关。同时,利用重力与水准资料计算研究了青藏高原东北缘同期单层密度时变图像特征,得出区内地震活动与地壳密度变化的局部异常、高梯度带和等值线的拐弯有关;再利用青藏高原东北缘的区域布格重力异常及人工地震剖面信息,反演了Moho面分布特征,及在此基础上研究了地壳密度变形和位移对地表重力变化的影响,并对青藏高原东北缘区域微重力长期变化与布格重力异常空间相关性作出解释。
Through whole adjustment calculation of the gravity observations of the northeastern edge of Qinghai-Tibet plateau,the gravity field variation characteristics in 1993-2003 are analyzed systematically.It is found that significant gravity changes appeared to be concentrated in regions with active faults.By using the calculated results of gravity and leveling data,the characteristics of single layer density time-varying image during 1993-2003 of the northeast edge of Qinghai-Tibet plateau are studied and it can be recognized that the seismic activity is related with the partial anomaly and high gradient of the variations of crustal density and the bending of its isoline.On the basis of the regional Bouguer gravity anomalies of northeastern edge of Qinghai-Tibet plateau and artificial seismic profile information,the distribution characteristics of Moho surface are inversed.Further more,the density deformation of crust and the influence of the displacement on the gravity change of the earth surface is studied as well.The spatial correlation between regional microgravity long-term change and Bouguer gravity anomalies of the northeastern edge of Qinghai-Tibet plateau are explained.
Through whole adjustment calculation of the gravity observations of the northeastern edge of Qinghai-Tibet plateau,the gravity field variation characteristics in 1993-2003 are analyzed systematically.It is found that significant gravity changes appeared to be concentrated in regions with active faults.By using the calculated results of gravity and leveling data,the characteristics of single layer density time-varying image during 1993-2003 of the northeast edge of Qinghai-Tibet plateau are studied and it can be recognized that the seismic activity is related with the partial anomaly and high gradient of the variations of crustal density and the bending of its isoline.On the basis of the regional Bouguer gravity anomalies of northeastern edge of Qinghai-Tibet plateau and artificial seismic profile information,the distribution characteristics of Moho surface are inversed.Further more,the density deformation of crust and the influence of the displacement on the gravity change of the earth surface is studied as well.The spatial correlation between regional microgravity long-term change and Bouguer gravity anomalies of the northeastern edge of Qinghai-Tibet plateau are explained.
引文
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7崔笃信,王庆良,王文萍.青藏块体东北缘地壳水平运动状态[J].大地测量与地球动力学,2004,(3):29-34.(Cui Duxin,Wang Qingliang and Wang Wenping.Crustalhorizontal movement state of the northeastern margin of Qing-hai-Tibet block[J].Journal of Geodesy and Geodynamics,2004,(3):29-34)
8祝意青,等.青藏块体东北缘重力场演化与地震活动[J].地震学报,2004,26(增):71-78.(Zhu Yiqing,et al.Gravity evolution and earthquake activities of the northeast-ern edge of Qinghai-Tibet block[J].Acta Seismologica Sini-ca,2004,17(Supp.):71-78)
9祝意青,等.民乐6.1、岷县5.2级地震前区域重力场变化研究[J].大地测量与地球动力学,2005,(1):24-29.(Zhu Yiqing,et al.Research on the variation of gravityfield before Minle Ms 6.1 and Minxian Ms 5.2 earthquakes[J].Journal of Geodesy and Geodynamics,2005,(1):24-29)
10祝意青,等.河西地区重力场及其动态演化特征[J].大地测量与地球动力学,2003,(4):44-48.(Zhu Yiqing,et al.Study on gravity field and its dynamic evolutionalcharacteristics in Hexi area[J].Journal of Geodesy and Ge-odynamics,2003,(4):44-48)
11朱桂芝,等.河西地区重力动态变化二维离散多尺度分解[J].大地测量与地球动力学,2004,(1):46-49.(Zhu Guizhi,et al.Multi-scale decomposition of 2-D dis-crete wavelet on gravity dynamic variation in Hexi region[J].Journal of Geodesy and Geodynamics,2004,(1):46-49)
12申重阳,李辉.研究现今地壳运动和强震机理的一种方法[J].地球物理学进展,2007,22(1):49-56.(ShenChongyang and Li Hui.A method of analyzing the presentcrustal movement and the mechanism of strong shocks[J].Progress in Geophysics,2007,22(1):49-56)
13申重阳.地壳形变与密度变化耦合运动探析[J].大地测量与地球动力学,2005,(3):7-12.(Shen Chongy-ang.Preliminary analysis of coupling movement betweencrustal deformation and density change[J].Journal of Ge-odesy and Geodynamics,2005,(3):7-12)
14祝意青,胡斌,张永志.永登5.8级地震前后的重力场动态图像特征研究[J].地壳形变与地震,1999,(1):71-77.(Zhu Yiqing,Hu Bin and Zhang Yongzhi.Study ofthe dynamic pattern characteristics of gravity aroud Yong-deng earthquake[J].Crustal Deformation and Earthquake,1999,(1):71-77)
15祝意青,等.景泰5.9级地震前后的重力变化研究[J].中国地震,2001,17(4):356-363(Zhu Yiqing,et al.Gravity variation research before and after Jingtai Ms5.9earthquake[J].Earthquake Research in China,2001,17(4):356-363)
16吴立辛,等:利用重力多尺度分解资料反演青藏高原东北缘地壳厚度[J].大地测量与地球动力学,2011,(1):19-23.(Wu Lixin,et al.Crustal thickness inversed frommulti-scale decomposition of bouguer gravity of Qinghai-Ti-bet plateau[J].Journal of Geodesy and Geodynamics,2011,(1):19-23)
17狄原幸男,罗岚,李辉.伴随地壳运动的重力变化研究及进展[J].国际地震动态,1996,(6):28-31.(Okada Y,Luo Lan and Li Hui.Gravity changes research and evolu-tion of going with crustal movement[J].Recent Develop-ments in World Seismology,1996,(6):28-31)
18滕吉文,等.2008年汶川Ms8.0地震发生的深层过程和动力学响应[J].地球物理学报,2008,51(5):1385-1 402.(Teng Jiwen,et al.Deep processes and dynamic re-sponses associated with the Wenchuan Ms8.0 earthquake of2008[J].Chinese J Geophys.,2008,51(5):1 385-1 402)
19朱岳清,吴兵,邢如英.1976年唐山地震前后的重力变化和震区莫霍面的变形[J].地震学报,1985,7(1):57-73.(Zhu Yueqing,Wu Bing and Xing Ruying.Gravityvariation Moho surface deformation before and after 1976Tangshan earthquake[J].Acta Seismologica Sinica,1985,7(1):57-73)
20郭树松,祝意青,刘芳.利用大陆均衡理论研究河西地区地壳的稳定性[J].大地测量与地球动力学,2011,(3):38-41.(Guo Shusong,Zhu Yiqing and Liu Fang.Re-search on stability of crust in Hexi area on crustal gravity i-sostasy theory[J].Journal of Geodesy and Geodynamics,2011,(3):38-41)
21陈石,等.青藏高原东缘重力导纳模型均衡异常时空特征[J].地球物理学报,2011,54(1):22-34.(Chen Shi,et al.Temporal and spatial features of isostasy anomaly u-sing gravitational admittance model at eastern margin of Ti-betan plateau[J].Chinese J Geophys.,2011,54(1):22-34)
2谢富仁,等.青藏高原北、东边缘第四纪构造应力环境演化特征[J].地震学报,1999,21(5):501-512.(XieFuren,et al.Evolution characteristics of quaternary tectonicsstress field in the north and east margin of Qinghai-Tibetplateau[J].Acta Seismologica Sinica,1999,21(5):501-512)
3陈九辉,等.青藏高原东北缘-鄂尔多斯地块地壳上地幔S波速度结构[J].地球物理学报,2005,48(2):333-342.(Chen Jiuhui,et al.Crustal and upper mantle S-wavevelocity structure across northeasten Tibetan plateau and Or-dos block[J].Chinese J Geophys.,2005,48(2):333-342)
4周民都,等.青藏高原东北缘地质构造背景及地壳结构研究[J].地震学报,2000,22(6):645-653.(Zhou Mindou,et a1.The geological structure background and the cru stal-structure in the northeastern margin of the Qinghai-Tibetplateau[J].Acta Seismologica Sinica,2000,22(6):645-53)
5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,etal.Recent horizontal movement and deformation in thenortheast margin of Qinghai-Tibet block[J].Chinese J Geo-phys.,2001,44(5):636-644)
6张希,等.青藏块体东北缘近期GPS水平运动特征与汶川大震影响[J].地震研究,2010,33(4):265-268.(Zhang Xi,et al.Features of current horizontal movementobserved by GPS and influence of the great Wenchuan earth-quake in the northeastern margin of Qinghai-Tibet block[J].Journal of Seismological Research,2010,33(4):265-268)
7崔笃信,王庆良,王文萍.青藏块体东北缘地壳水平运动状态[J].大地测量与地球动力学,2004,(3):29-34.(Cui Duxin,Wang Qingliang and Wang Wenping.Crustalhorizontal movement state of the northeastern margin of Qing-hai-Tibet block[J].Journal of Geodesy and Geodynamics,2004,(3):29-34)
8祝意青,等.青藏块体东北缘重力场演化与地震活动[J].地震学报,2004,26(增):71-78.(Zhu Yiqing,et al.Gravity evolution and earthquake activities of the northeast-ern edge of Qinghai-Tibet block[J].Acta Seismologica Sini-ca,2004,17(Supp.):71-78)
9祝意青,等.民乐6.1、岷县5.2级地震前区域重力场变化研究[J].大地测量与地球动力学,2005,(1):24-29.(Zhu Yiqing,et al.Research on the variation of gravityfield before Minle Ms 6.1 and Minxian Ms 5.2 earthquakes[J].Journal of Geodesy and Geodynamics,2005,(1):24-29)
10祝意青,等.河西地区重力场及其动态演化特征[J].大地测量与地球动力学,2003,(4):44-48.(Zhu Yiqing,et al.Study on gravity field and its dynamic evolutionalcharacteristics in Hexi area[J].Journal of Geodesy and Ge-odynamics,2003,(4):44-48)
11朱桂芝,等.河西地区重力动态变化二维离散多尺度分解[J].大地测量与地球动力学,2004,(1):46-49.(Zhu Guizhi,et al.Multi-scale decomposition of 2-D dis-crete wavelet on gravity dynamic variation in Hexi region[J].Journal of Geodesy and Geodynamics,2004,(1):46-49)
12申重阳,李辉.研究现今地壳运动和强震机理的一种方法[J].地球物理学进展,2007,22(1):49-56.(ShenChongyang and Li Hui.A method of analyzing the presentcrustal movement and the mechanism of strong shocks[J].Progress in Geophysics,2007,22(1):49-56)
13申重阳.地壳形变与密度变化耦合运动探析[J].大地测量与地球动力学,2005,(3):7-12.(Shen Chongy-ang.Preliminary analysis of coupling movement betweencrustal deformation and density change[J].Journal of Ge-odesy and Geodynamics,2005,(3):7-12)
14祝意青,胡斌,张永志.永登5.8级地震前后的重力场动态图像特征研究[J].地壳形变与地震,1999,(1):71-77.(Zhu Yiqing,Hu Bin and Zhang Yongzhi.Study ofthe dynamic pattern characteristics of gravity aroud Yong-deng earthquake[J].Crustal Deformation and Earthquake,1999,(1):71-77)
15祝意青,等.景泰5.9级地震前后的重力变化研究[J].中国地震,2001,17(4):356-363(Zhu Yiqing,et al.Gravity variation research before and after Jingtai Ms5.9earthquake[J].Earthquake Research in China,2001,17(4):356-363)
16吴立辛,等:利用重力多尺度分解资料反演青藏高原东北缘地壳厚度[J].大地测量与地球动力学,2011,(1):19-23.(Wu Lixin,et al.Crustal thickness inversed frommulti-scale decomposition of bouguer gravity of Qinghai-Ti-bet plateau[J].Journal of Geodesy and Geodynamics,2011,(1):19-23)
17狄原幸男,罗岚,李辉.伴随地壳运动的重力变化研究及进展[J].国际地震动态,1996,(6):28-31.(Okada Y,Luo Lan and Li Hui.Gravity changes research and evolu-tion of going with crustal movement[J].Recent Develop-ments in World Seismology,1996,(6):28-31)
18滕吉文,等.2008年汶川Ms8.0地震发生的深层过程和动力学响应[J].地球物理学报,2008,51(5):1385-1 402.(Teng Jiwen,et al.Deep processes and dynamic re-sponses associated with the Wenchuan Ms8.0 earthquake of2008[J].Chinese J Geophys.,2008,51(5):1 385-1 402)
19朱岳清,吴兵,邢如英.1976年唐山地震前后的重力变化和震区莫霍面的变形[J].地震学报,1985,7(1):57-73.(Zhu Yueqing,Wu Bing and Xing Ruying.Gravityvariation Moho surface deformation before and after 1976Tangshan earthquake[J].Acta Seismologica Sinica,1985,7(1):57-73)
20郭树松,祝意青,刘芳.利用大陆均衡理论研究河西地区地壳的稳定性[J].大地测量与地球动力学,2011,(3):38-41.(Guo Shusong,Zhu Yiqing and Liu Fang.Re-search on stability of crust in Hexi area on crustal gravity i-sostasy theory[J].Journal of Geodesy and Geodynamics,2011,(3):38-41)
21陈石,等.青藏高原东缘重力导纳模型均衡异常时空特征[J].地球物理学报,2011,54(1):22-34.(Chen Shi,et al.Temporal and spatial features of isostasy anomaly u-sing gravitational admittance model at eastern margin of Ti-betan plateau[J].Chinese J Geophys.,2011,54(1):22-34)
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