【摘要】 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.更多还原

【Abstract】 Wenchuan MS8.0 earthquake and its 15 large aftershocks(MS≥5.4) induced coseismic water level change in the Tangshan well. We statistically analyzed the correlation between the coseismic variation parameters (such as maximum amplitude of oscillations, duration of variation, coseismic stepwise change and difference of variation time) and earthquake parameters (such as magnitude, epicenter distance and focal depth, and corresponding seismic phase type at the same time when the maximum variation amplitude appeared. Seismic phases were recorded by Dohe station, about 16.3 km away from the well). We drew the following conclusions: The main factor affecting water level change is earthquake magnitude, and the epicenter distance and focal depth have a little affection. MS magnitude is the best choice for analyzing coseismic water level variation in comparison with MW and ML. There exists good correlation between the stepwise change amplitude and duration of water level oscillation and the maximum water level change amplitude. They are all caused by dynamic strain induced by seismic waves. The appearing time of maximum amplitude of seismic oscillation is between the arrival of S wave and Rayleigh wave. The water level response is the co-effect of the arrived seismic waves and hydro-geological environment variation.更多还原