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汶川大震时福建四种观测系统的体应变响应分析

Analysis of Volumetric Strain Response Caused by Wenchuan Earthquake Based on Observation Data of Well Level Observation Systems

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【作者】 陈莹刘序俨朱石军郑小菁李军王林陈光沈健健

【Author】 CHEN Ying~1,LIU Xuyan~1,ZHU Shijun~2,ZHENG Xiaoqing~1,LI Jun~1, WANG Lin~1,CHEN Guang~1 and SHEN Jianjian~1 (1.Earthquake Administration of Fujian Province,Fuzhou 350003,China; 2.Earthquake A dministration of Beijing Municipality,Beijing 102100,China)

【机构】 福建省地震局北京市地震局

【摘要】 采用福建省有关观测点的井水位、地震仪、体应变仪与伸缩仪的分钟值观测资料对福建地区对2008年5月12日四川汶川8.0级大震的体应变响应进行了计算,计算结果表明,由井水位、体应变仪与伸缩仪所得到的对汶川大震的体应变响应的振幅为10-7~10-8,而由地震仪所得到的体应变响应要比前者大1个数量级;并对此差异进行了分析。

【Abstract】 On the basis of the concept that well water observation system is a natural body strain gauge,the calibration method of scale values of well water level observation were given and well level observation were converted into volumetric strains in this paper.Further,the maximum amplitudes and periods of radial and vertical displacements caused by Rayleigh surface waves of Wenchuan earthquake can be measured by seismograph,and volumetric strain responses to surface wave of Wenchuan earthquake can also be calculated according to the displacement divergence formulation.Based on the minutely values obtained from different digital observation system of well water level,seismometer,volumetric strainmeter and extensometer installed at certain observational stations in Fujian province,various volumetric strain responses of the above four observation systems to Wenchuan M_S8.0 earthquake were computed and analyzed.The results of the four observational systems show that for the well water level,volumetric strainmeter and extensometer systems,the amplitude of volumetric strain response to Wenchuan earthquake varies from 10-7 to 10-8,whereas for the seismograph system the corresponding amplitude is larger by one order of magnitude.Finally,this paper gives analyses on this discrepancy of amplitude.

【基金】 2009年度震情跟踪一般定向工作任务的资助项目
  • 【文献出处】 华南地震 ,South China Journal of Seismology , 编辑部邮箱 ,2009年04期
  • 【分类号】P315.723
  • 【被引频次】4
  • 【下载频次】29
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