汶川地震前成都台重力的高频扰动

英文篇名：GRAVITY DISTURBANCE OF HIGH FREQUCNCY AT CHENGDU SEISMOSTATION BEFORE WENCHUAN Ms8.0 EARTHQUAKE
中文刊名：大地测量与地球动力学
英文刊名：Journal of Geodesy and Geodynamics
作者：韦进 ; 郝洪涛 ; 康开轩 ; 刘子维 ; 喻节林 ; 孙少安 ; 申重阳 ; 李辉
英文作者：Wei Jin1 ; 2) ; Hao Hongtao1 ; 2) ; Kang Kaixuan1 ; 2) ; Liu Ziwei1 ; 2) ; Yu Jielin1 ; 2) ; Sun Shaoan1 ; 2) ; Shen Chongyang1 ; 2) and Li Hui1 ; 2)(1)Institute of Seismology ; CEA ; Wuhan 4300712)Crustal Movement Laboratory ; Wuhan 430071)
中文关键词：汶川地震 ; 高频扰动 ; 热带气旋 ; 成都地震台 ; 重力仪
英文关键词：Wenchuan earthquake ; significant disturbance ; tropical cyclone ; Chengdu seismostation ; gravity meter
出版日期：2009-08-15
机构：中国地震局地震研究所;地壳运动与地球观测实验室;
年：2009
期：S1
出版单位：大地测量与地球动力学

摘要

汶川8.0级地震发生前48小时,距震中约37千米的成都地震台GS15型重力仪记录到了附有高频扰动的潮汐观测数据。对该仪器不同时段观测数据的比较表明:这种高频扰动主要来自外界因素的影响。对2008年32个热带气旋,以及5.0—7.0级地震的统计分析表明:与热带气旋对应出现的高频扰动比例高于地震震前出现的扰动,而且低等级的相似距离的热带气旋也能够产生类似扰动现象。由此判定,汶川地震前48小时成都地震台出现的重力高频扰动主要来自热带气旋的影响。
About 48 hours before the Wenchuan Ms8.0 earthquake,significant gravity pulsation was observed at the Chengdu seismostation by using GS15 gravity meter.Comparing the earth tide data in different periods of time,it is demonstrated that the significant gravity pulsation are mainly affected by the external factors.32 tropical cyclones,the occurrence of Ms≥6.0 in China and Ms ≥7.0 in world were selected and statistically analyzed.It is shown that the rate of significant gravity pulsation during the occurrence of tropical cyclones is far more than those during before the occurrence of the earthquake,and the same gravity pulsation can be observed by even weaker tropical cyclones.So the significant gravity pulsation at the Chengdu seismostation is mainly affected from the tropical cyclones before the Wenchuan earthquake.

引文

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