川西地区重力变化与汶川地震
|
摘要
利用川西地区1998—2008年流动重力观测资料获得的区域重力场时空动态变化结果,分析川西地区重力场变化特征及其与汶川8.0级地震的关系,结果表明:1)重力变化与断裂构造活动存在密切空间联系,重力测量较好地反映了伴随活动断层的物质迁移和构造变形引起的地表重力变化效应;2)汶川地震孕育发生阶段,重力场出现较大范围的区域性重力异常,重力场动态图像较清晰地反映了本区重力场由准均匀态-地震孕育的非均匀态-发震的演化过程。
On the basis of mobile gravity observation data from 1998 to 2008 in western Sichuan, spatial dynamic variation results of regional gravity field are obtained, the relations between the gravity variation features and Wenchuan Ms8.0 earthquake are systematically analysised.The results show: 1)gravity change is closely related to active fault tectonics, gravity measurement can reflect material migration accompanying active fault and crustal tectonic activity well. 2)The regional gravity variations in a wide range appeared during Wenchuan earthquake. The dynamic patterns of gravity field mirrored the evolution process of gravity field :quasi-homogeneous state-non-homogeneous state-earthquake occurence.
On the basis of mobile gravity observation data from 1998 to 2008 in western Sichuan, spatial dynamic variation results of regional gravity field are obtained, the relations between the gravity variation features and Wenchuan Ms8.0 earthquake are systematically analysised.The results show: 1)gravity change is closely related to active fault tectonics, gravity measurement can reflect material migration accompanying active fault and crustal tectonic activity well. 2)The regional gravity variations in a wide range appeared during Wenchuan earthquake. The dynamic patterns of gravity field mirrored the evolution process of gravity field :quasi-homogeneous state-non-homogeneous state-earthquake occurence.
引文
1 闻学泽.四川西部鲜水河-安宁河-则木河断裂带的地震破裂分段特征[J].地震地质,2000,22(3):1-11.(Wen Xueze.Character of rupture segmentation of the Xianshuihe-Anninghe-Zemuhe fault zone,western Sichuan[J].Seismolo-gy and Geology,2000,22(3):1-11)
2 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 evolutional charac-teristics in Hexi area[J].Journal of Geodesy and Geodynam-ics,2003,(4):44-48)
3 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 gravity field before MinleMs6.1and MinxianMs5.2earthquakes[J].Journal of Geodesy and Geodynamics,2005,(1):24-29)
4 贾民育,邢灿飞,孙少安.滇西实验场重力资料的最佳解[J].地震学报,1994,16(增刊):100-108.(Jia Minyu,Xing Canfei and Sun Shaoan.Optimum solution of the gravi-tational data in western-Yunnan experimental field[J].Acta Seismologica Sinca,1994,16(Supp.):100-108)
5 孙少安,项爱民.区域重力场相对基准的建立[J].地壳形变与地震,1999,19(1):78-81.(Sun Shaoan and Xiang Aimin.Establishment of relative datum for regional gravita-tional filed[J].Crustal Deformation and Earthquake,1999,(1):78-81)
6 龙思胜.2001年四川雅江6.0级地震序列的破裂特征及发震构造[J].中国地震,2004,20(1):1-11.(Long Sish-eng.Fracture characters and statutory of the Yajiang earth-quake sequence withMs6.0in the Sichuan region in2001[J].Eaethquake Research in China,2004,20(1):1-11)
7 祝意青,等.南北地震带和青藏块体东部重力场演化与地震特征[J].中国地震,2001,17(1):56-69.(Zhu Yiqing,et al.Study on evolution of gravity field prediction in the North-South Seismic Belt and the eastern Qinghai-Tibet block[J].Earthquake Research in China,2001,17(1):56-69)
8 张国民.地震预报与震灾预测[J].地震地磁观测与研究,1996,17(3):21-56.(Zhang Guomin.Earthquake and its disaster prediction[J].Seismological and Geomagnetic Ob-servation and Research,1996,17(3):21-56)
9 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):1385-1402.(Teng Jiwen,et al.Deep processes and dynamic re-sponses associated with the WenchuanMs8.0earthquake of2008[J].Chinese J.Geophys,2008,51(5),1385-1402)
10 刘启元,等.汶川8.0地震:地壳上地幔s波速度结构的初步研究[J].地球物理学报,2009,52(2):309-319.(Liu Qiyuan,et al.WenchuanM8.0earthquake:prelimina-ry study of the S-wave velocity structure of the crust and up-per mantle[J].Chinese J.Geophys,2009,52(2):309-319)
11 贾民育,詹洁辉.中国地震重力监测体系的结构与能力[J].地震学报,2000,22(4):360-367.(Jia Minyu and Zhan Jiehui.The structure and ability of the china seismo-logical gravity monitoring system[J].Acta Seismologica Sinica,2000,22(4):360-367)
12 祝意青,王庆良,徐云马.我国流动重力监测预报发展的思考[J].国际地震动态,2008,(9):19-25.(Zhu Yiqing,Wang Qingliang and Xu Yunma.Thoughts on the development of earthquake monitoring and prediction in mo-bile gravity[J].Recent Developments in World Seismology,2008,(9):19-25)
2 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 evolutional charac-teristics in Hexi area[J].Journal of Geodesy and Geodynam-ics,2003,(4):44-48)
3 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 gravity field before MinleMs6.1and MinxianMs5.2earthquakes[J].Journal of Geodesy and Geodynamics,2005,(1):24-29)
4 贾民育,邢灿飞,孙少安.滇西实验场重力资料的最佳解[J].地震学报,1994,16(增刊):100-108.(Jia Minyu,Xing Canfei and Sun Shaoan.Optimum solution of the gravi-tational data in western-Yunnan experimental field[J].Acta Seismologica Sinca,1994,16(Supp.):100-108)
5 孙少安,项爱民.区域重力场相对基准的建立[J].地壳形变与地震,1999,19(1):78-81.(Sun Shaoan and Xiang Aimin.Establishment of relative datum for regional gravita-tional filed[J].Crustal Deformation and Earthquake,1999,(1):78-81)
6 龙思胜.2001年四川雅江6.0级地震序列的破裂特征及发震构造[J].中国地震,2004,20(1):1-11.(Long Sish-eng.Fracture characters and statutory of the Yajiang earth-quake sequence withMs6.0in the Sichuan region in2001[J].Eaethquake Research in China,2004,20(1):1-11)
7 祝意青,等.南北地震带和青藏块体东部重力场演化与地震特征[J].中国地震,2001,17(1):56-69.(Zhu Yiqing,et al.Study on evolution of gravity field prediction in the North-South Seismic Belt and the eastern Qinghai-Tibet block[J].Earthquake Research in China,2001,17(1):56-69)
8 张国民.地震预报与震灾预测[J].地震地磁观测与研究,1996,17(3):21-56.(Zhang Guomin.Earthquake and its disaster prediction[J].Seismological and Geomagnetic Ob-servation and Research,1996,17(3):21-56)
9 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):1385-1402.(Teng Jiwen,et al.Deep processes and dynamic re-sponses associated with the WenchuanMs8.0earthquake of2008[J].Chinese J.Geophys,2008,51(5),1385-1402)
10 刘启元,等.汶川8.0地震:地壳上地幔s波速度结构的初步研究[J].地球物理学报,2009,52(2):309-319.(Liu Qiyuan,et al.WenchuanM8.0earthquake:prelimina-ry study of the S-wave velocity structure of the crust and up-per mantle[J].Chinese J.Geophys,2009,52(2):309-319)
11 贾民育,詹洁辉.中国地震重力监测体系的结构与能力[J].地震学报,2000,22(4):360-367.(Jia Minyu and Zhan Jiehui.The structure and ability of the china seismo-logical gravity monitoring system[J].Acta Seismologica Sinica,2000,22(4):360-367)
12 祝意青,王庆良,徐云马.我国流动重力监测预报发展的思考[J].国际地震动态,2008,(9):19-25.(Zhu Yiqing,Wang Qingliang and Xu Yunma.Thoughts on the development of earthquake monitoring and prediction in mo-bile gravity[J].Recent Developments in World Seismology,2008,(9):19-25)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心