汶川M_S8.0地震前后的重力场动态变化
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摘要
利用国家重大科学工程"中国地壳运动观测网络"1998—2008年绝对重力和相对重力的观测资料,获得了南北地震带地区的重力场及其动态变化,从动态的观点研究了2008年5月12日汶川8.0级地震前后区域重力场演化特征及其与地震活动的关系.重力场变化既具有时-空分布的不均匀性,同时又具有与活动断裂构造密切相关和与地震孕育发展有着内在联系.重力场动态变化图象较清晰地反映了汶川大地震孕育、发生过程中出现的重力前兆信息.
Based on the data of absolute and relative gravity observations of the national major scientific project China Crustal Movement Observation Network from 1998 to 2008,gravity field in the North-South seismic belt region and its dynamic variations are obtained. The evolution characteristics of regional gravity field and its relationship with the seismic activity before and after the 12 May 2008 Wenchuan MS8.0 earthquake are studied in the sight of dynamics. The dynamic variation image of gravity field reflect the portentous information of the development and occurrence of Wenchuan MS8.0 earthquake more clearly. The variations of gravity field show spatial and temporal inhomogeneity,at the same time,however,they reveal certain relation associated with the development and occurrence of the earthquake,and associated also with regional tectonic activity.
Based on the data of absolute and relative gravity observations of the national major scientific project China Crustal Movement Observation Network from 1998 to 2008,gravity field in the North-South seismic belt region and its dynamic variations are obtained. The evolution characteristics of regional gravity field and its relationship with the seismic activity before and after the 12 May 2008 Wenchuan MS8.0 earthquake are studied in the sight of dynamics. The dynamic variation image of gravity field reflect the portentous information of the development and occurrence of Wenchuan MS8.0 earthquake more clearly. The variations of gravity field show spatial and temporal inhomogeneity,at the same time,however,they reveal certain relation associated with the development and occurrence of the earthquake,and associated also with regional tectonic activity.
引文
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贾民育,詹洁辉.2000.中国地震重力监测体系的结构与能力[J].地震学报,22(4):360-367.
江在森,方颖,武艳强,王敏,杜方,平建军.2009.汶川8.0级地震前区域地壳运动与变形动态过程[J].地球物理学报,52(2):505-518.
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孙和平.2004.重力场的时间变化与地球动力学[J].中国科学院院刊,19(3):189-193.
滕吉文,白登海,杨辉,闫雅芬,张洪双,张永谦,阮小敏.2008.2008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,51(5):1385-1402.
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张季生,高锐,曾令森,李秋生,管烨,贺日政,王海燕,卢占武.2009.龙门山及邻区重、磁异常特征及与地震关系的研究[J].地球物理学报,52(2):572-578.
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张永仙,石耀霖,刘桂萍.2000.热物质上涌与震前重力异常关系初探[J].地震,20(增刊):135-141.
郑金涵,宋合胜,刘克人,卢红艳,郭宗汾.2003.利用重力资料反演京津唐张地区震质中[J].地震学报,25(4):422-431.
祝意青,王双绪,江在森,朱桂芝,李辉,张永志.2003.昆仑山口西8.1级地震前重力变化[J].地震学报,25(3):291-297.
祝意青,李辉,朱桂芝,徐云马.2004.青藏块体东北缘重力场演化与地震活动[J].地震学报,26(增刊):71-78.
祝意青,梁伟锋,李辉,孙和平.2007.中国大陆重力场变化及其引起的地球动力学特征[J].武汉大学学报(信息科学版),32(3):246-250.
祝意青,梁伟锋,徐云马.2008.重力资料对2008年汶川MS8.0地震的中期预测[J].国际地震动态,(7):36-39.
祝意青,徐云马,吕弋培,李铁明.2009.龙门山断裂带重力变化与汶川8.0级地震关系研究[J].地球物理学报,52(10):2538-2546.
Chen Y T,Gu HD,Lu Z X.1979.Variations of gravity before and after the haicheng earthquake,1975,andthe Tangs-han earthquake,1976[J].Phys Earth Planet Interi,18(4):330-338.
I manishi Y T,Sato T,Higashi T,Sun WK,Okubo S.2004.Anetwork of superconducting gravi meters detects submi-crogal coseismic gravity changes[J].Science,306(5695):476-478.
Kuo J T,Zheng J H,Song S H.1999.Determination of earthquake epicentroids byinversion of gravity variation data ithe BTTZ region,China[J].Tectonophysics,312(2):267-281.
贾民育,詹洁辉.2000.中国地震重力监测体系的结构与能力[J].地震学报,22(4):360-367.
江在森,方颖,武艳强,王敏,杜方,平建军.2009.汶川8.0级地震前区域地壳运动与变形动态过程[J].地球物理学报,52(2):505-518.
刘克人,刘瑞法,郑金涵,宋胜合,郭凤义,卢红艳.1998.1991—1997年首都圈重力变化与地震预测[J].地震地磁观测与研究,19(1A):100-106.
楼海,王椿镛,吕智勇,姚志祥,戴仕贵,尤惠川.2008.2008年汶川MS8.0级地震的深部构造环境[J].中国科学:D辑,38(10):1207-1220.
孙和平.2004.重力场的时间变化与地球动力学[J].中国科学院院刊,19(3):189-193.
滕吉文,白登海,杨辉,闫雅芬,张洪双,张永谦,阮小敏.2008.2008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,51(5):1385-1402.
邢乐林,李辉,何志堂,董正瑶,谈洪波.2008.成都基准台绝对重力复测结果分析[J].大地测量与地球动力学,28(6):38-42.
许厚泽.2003.重力观测在中国地壳运动观测网络中的作用[J].大地测量与地球动力学,23(3):1-3.
张季生,高锐,曾令森,李秋生,管烨,贺日政,王海燕,卢占武.2009.龙门山及邻区重、磁异常特征及与地震关系的研究[J].地球物理学报,52(2):572-578.
张培震,徐锡伟,闻学泽,冉勇康.2008.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,51(4):1066-1073.
张为民,王勇,周旭华.2008.我国绝对重力观测技术应用研究与展望[J].地球物理学进展,23(1):69-72.
张永仙,石耀霖,刘桂萍.2000.热物质上涌与震前重力异常关系初探[J].地震,20(增刊):135-141.
郑金涵,宋合胜,刘克人,卢红艳,郭宗汾.2003.利用重力资料反演京津唐张地区震质中[J].地震学报,25(4):422-431.
祝意青,王双绪,江在森,朱桂芝,李辉,张永志.2003.昆仑山口西8.1级地震前重力变化[J].地震学报,25(3):291-297.
祝意青,李辉,朱桂芝,徐云马.2004.青藏块体东北缘重力场演化与地震活动[J].地震学报,26(增刊):71-78.
祝意青,梁伟锋,李辉,孙和平.2007.中国大陆重力场变化及其引起的地球动力学特征[J].武汉大学学报(信息科学版),32(3):246-250.
祝意青,梁伟锋,徐云马.2008.重力资料对2008年汶川MS8.0地震的中期预测[J].国际地震动态,(7):36-39.
祝意青,徐云马,吕弋培,李铁明.2009.龙门山断裂带重力变化与汶川8.0级地震关系研究[J].地球物理学报,52(10):2538-2546.
Chen Y T,Gu HD,Lu Z X.1979.Variations of gravity before and after the haicheng earthquake,1975,andthe Tangs-han earthquake,1976[J].Phys Earth Planet Interi,18(4):330-338.
I manishi Y T,Sato T,Higashi T,Sun WK,Okubo S.2004.Anetwork of superconducting gravi meters detects submi-crogal coseismic gravity changes[J].Science,306(5695):476-478.
Kuo J T,Zheng J H,Song S H.1999.Determination of earthquake epicentroids byinversion of gravity variation data ithe BTTZ region,China[J].Tectonophysics,312(2):267-281.
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