2010年玉树Ms7.1地震前的重力变化
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摘要
利用中国地壳运动观测网络1998—2008年绝对重力和相对重力观测资料,获得了玉树地震区域重力场及其动态变化,从动态的观点研究了2010年4月14日玉树Ms7.1地震前区域重力场演化特征及其与地震活动的关系。结果表明:1)重力变化与甘孜-玉树断裂构造活动存在密切的空间联系,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)区域重力场动态图像较完整地反映了2010年4月14日玉树7.1级地震孕育、发生过程中出现的流动重力观测得到的异常前兆信息;3)玉树震中附近重力点值时序变化累积量超过80×10-8ms-2,较好地反映了玉树地震前重力测点随时间的剧烈波动性上升变化。
On the basis of the absolute and relative gravity observations of the national major scientific project—China Crustal Movement Observation Network from 1998 to 2008,gravity field and its dynamic variations of Yushu earthquake are obtained,and the evolution characteristics of regional gravity field and its relation with the seismic activity before and after Yushu Ms7.1 earthquake occurred on April 14,2010 are studied in the sight of dynamics.The results show as follows.1)The gravity change are closely related to Ganzi-Yushu active fault i.e.,the gravity observation can reflect material migration accompanying active fault and crustal tectonic activity well.2)The dynamic variation images of gravity field reflect the anomalous informations of the gravity field observed with mobile survey with the development and occurrence of Yushu Ms7.1 earthquake clearly.3)Temporal changes of gravity points nearby Yushu epicenter amount to more than 80×10-8ms-2,it reflected wavelike rises with gravity change before Yushu earthquake in time.
On the basis of the absolute and relative gravity observations of the national major scientific project—China Crustal Movement Observation Network from 1998 to 2008,gravity field and its dynamic variations of Yushu earthquake are obtained,and the evolution characteristics of regional gravity field and its relation with the seismic activity before and after Yushu Ms7.1 earthquake occurred on April 14,2010 are studied in the sight of dynamics.The results show as follows.1)The gravity change are closely related to Ganzi-Yushu active fault i.e.,the gravity observation can reflect material migration accompanying active fault and crustal tectonic activity well.2)The dynamic variation images of gravity field reflect the anomalous informations of the gravity field observed with mobile survey with the development and occurrence of Yushu Ms7.1 earthquake clearly.3)Temporal changes of gravity points nearby Yushu epicenter amount to more than 80×10-8ms-2,it reflected wavelike rises with gravity change before Yushu earthquake in time.
引文
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2邢乐林,等.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,2008,(6):38-42.(Xing Lelin,et al.Analysis of repeatet absolute gravity surveying results atChengdu seismostation[J].Journal of Geodesy and Geody-namics,2008,(6):38-42)
3祝意青,徐云马,梁伟锋.2008年新疆于田Ms7.3地震的中期预测[J].大地测量与地球动力学,2008,(5):13-15.(Zhu Yiqing,Xu Yunma and Liang Weifeng.Medium-term prediction of Yutian,XinjiangMs7.3 earthquake in2008[J].Journal of geodesy and geodynamics,2008,(5):13-15)
4祝意青,等.汶川Ms8.0地震前后的重力场动态变化[J].地震学报,2010,32(6):633-640.(Zhu Yiqing,etal.Dynamic variation of gravity field before and after Wen-chuanMs8.0 earthquake[J].Acta Seismologica Sinica,2010,32(6):633-640)
5祝意青,等.昆仑山口西8.1级地震前重力变化[J].地震学报,2003,25(3):291-297.(Zhu Yiqing,et al.Gravityvariation before Kunlun mountain pass westernMs8.1 earth-quake[J].Acta Seismologica Sinica,2003,25(3):291-297)
6江在森,等.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,2009,52(2):505-518.(JiangZaisen,et al.The dynamic process of regional crustal move-ment and deformation before WenchuanMs8.0 earthquake[J].Chinese J.Geophys,2009,52(2):505-518)
7 Zhu Yiqing,et al.Gravity measurements and their variationsbefore the 2008 Wenchuan earthquake[J].BSSA,2010,100(5B):2 815?2 824.
8顾功叙,等.中国京津唐张地区时间上连续的重力变化与地震的孕育和发生[J].科学通报,1997,42(18):1 919-1 930.(Gu Gongxu,et al.Seismogenesis and oc-currence of earthquakes as observed by temporally continu-ous gravity variations in China[J].Chinese Science Bulle-tin,1997,42(18):1 919-1 930)
9 Chen Y T,Gu HD and Lu Z X.Variations of gravity beforeand after the Haicheng earthquake,1975,and the Tangshanearthquake,1976[J].Physics of the Earth and PlanetaryInteriors,1979,18(4):330-338.
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 andGeodynamics,2003,(4):44-48)
11祝意青,等.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,2009,52(10):2 538-2 546.(Zhu Yiqing,et al.Relations between gravity varia-tion of Longmenshan fault zone and WenchuanMs8.0earthquake[J].Chinese J.Geophys,2009,52(10):2 538-2 546)
12祝意青,郭树松,刘芳.攀枝花6.1、姚安6.0级地震前后区域重力场变化[J].大地测量与地球动力学,2010,(4):8-11.(Zhu Yiqing,Guo Shusong and Liu Fang.Variation of gravity field before and after PanzhihuaMs6.1and YaoanMs6.0 earthquakes[J].Journal of Geodesy andGeodynamics,2010,(4):8-11)
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