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Characteristics of coseismic water level changes at Tangshan well for the Wenchuan MS_8.0 earthquake and its larger aftershocks
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作者 Baojun Yin Li Ma +3 位作者 Huizhong Chen Jianping Huang Chaojun Zhang Wuxing Wang 《Earthquake Science》 CSCD 2009年第2期149-157,共9页
Coseismic water level changes which may have been induced by the Wenchuan Ms8.0 earthquake and its 15 larger aftershocks (Ms〉5.4) have been observed at Tangshan well. We analyze the correlation between coseismic pa... Coseismic water level changes which may have been induced by the Wenchuan Ms8.0 earthquake and its 15 larger aftershocks (Ms〉5.4) have been observed at Tangshan well. We analyze the correlation between coseismic parameters (maximum amplitude, duration, coseismic step and the time when the coseismic reach its maximum amplitude) and earthquake parameters (magnitude, well-epicenter distance and depth), and then compare the time when the coseismic oscillation reaches its maximum amplitude with the seismogram from Douhe seismic station which is about 16.3 km away from Tangshan well. The analysis indicates that magnitude is the main factor influencing the induced coseismic water level changes, and that the well-epicenter distance and depth have less influence. Ms magnitude has the strongest correlation with the coseismic water level changes comparing to Mw and ML magnitudes. There exists strong correlation between the maximum amplitude, step size and the oscillation duration. The water level oscillation and step are both caused by dynamic strain sourcing from seismic waves. Most of the times when the oscillations reach their maximum amplitudes are between S and Rayleigh waves. The coseismic water level changes are due to the co-effect of seismic waves and hydro-geological environments. 展开更多
关键词 Wenchuan Ms8.0 earthquake Tangshan well coseismic water level variation analog water level record
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汶川8.0级地震及其强余震引起的唐山井水位同震响应特征分析 被引量:21
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作者 尹宝军 马丽 +3 位作者 陈会忠 黄建平 张晁军 王武星 《地震学报》 CSCD 北大核心 2009年第2期195-204,共10页
统计了汶川8.0级地震及其强余震引起的唐山井水位同震变化的幅度参数(最大振幅、阶变量)和时间参数(最大振幅时刻,同震持续时间),以及邻近的陡河台记录的地震波的体波和面波的到时.计算分析了同震参数与震级(ML,MS和MW三种震级)、井-震... 统计了汶川8.0级地震及其强余震引起的唐山井水位同震变化的幅度参数(最大振幅、阶变量)和时间参数(最大振幅时刻,同震持续时间),以及邻近的陡河台记录的地震波的体波和面波的到时.计算分析了同震参数与震级(ML,MS和MW三种震级)、井-震距、震源深度的相关方程及同震参数间的相关关系.结果表明,同震变化量与MS震级的相关性最好,与震源深度和井-震距相关性较弱;同震最大幅度与同震阶变量、同震持续时间相关性很高,水位同震振荡和阶变均来自地震波引起的动应变;水位同震振荡的最大振幅发生在S波至瑞利波时段,水位同震响应是地震波与水文地质环境等多种因素共同作用的结果. 展开更多
关键词 汶川8.0级地震 唐山井 水位同震变化 模拟水位
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