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气温变化对唐山地震台跨断层形变观测的影响
黄建平1,2, 石耀霖2, 孙玉军3, 李文静4
1.中国地震局地震预测研究所,北京市复兴路63号100036;2.中国科学院研究生院计算地球动力学实验室,北京市玉泉路甲19号100039;3.中国地质科学院地质力学研究所,北京100081;4.中国地震局第一监测中心唐山台,河北唐山063001
摘要:
利用三维热—弹性模型有限元方法,模拟了唐山地震台及其周边地区在地表温度呈不同幅度的周期性变化的情况下,对台站短基线观测的影响,并对由于地表温度变化产生的应变进行了估算。计算结果表明,由于温度差异造成的观测桩距离的年变化幅度达到2mm左右,这与目前台站观测数据的年变化幅度基本一致,表明台站观测数据包含了温度的重要影响。另外,台站各基线桩的位移序列相对于温度变化滞后了1~1.5个月的时间。同时发现,台站短基线各测段的实际观测数据存在着同步的趋势性变化,这不是稳定年变化的温度变化能解释的,因此这种趋势变化可能与局部应力场调整或者断层活动有关。
关键词:  有限元 温度变化 唐山台 跨断层观测
DOI:
分类号:
基金项目:中国地震局地震预测研究所基本科研业务项目(0207690236); 国家自然科学基金(41104030)共同资助
Effect of air temperature variation on the cross-fault deformation observations at the Tangshan seismic station
Huang Jianping1,2, Shi Yaolin2, Sun Yujun3, Li Wenjing4
1.Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;2.Lab of Computational Geodynamics, Graduate University of Chinese Academy Sciences, Beijing 100039, China;3.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;4.Tangshan Deformation Station of the First Crust Monitoring Center, China Earthquake Administration, Tangshan 063001, China
Abstract:
The finite element method (FEM) of 3D linear elastic model has been used to calculate the effect of ground temperature variation with different amplitudes to the baseline observation in and around Tangshan seismic station. And the strain induced from the ground temperature variations was also estimated. The results show that the yearly amplitude of the displacement among bench marks induced by the temperature variation can be up to 2mm or so, which is almost the same as that of the yearly variation of the data observed at the station. This means that the effect of the temperature is included in the data. What's more, the displacements among 4 bench marks and their strain serials are delayed about 1 or 1.5 months compared with the temperature changes. At the same time, there are synchronous trend changes in the 4 segments, which cannot be explained from the temperature variation and may be connected with the strain adjustment and/or fault movements.[著者文摘]
Key words:  Finite element method (FEM) Temperature variation Tangshan seismicstation Cross-fault observation