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收集整理了河北省地下流体观测井网对尼泊尔MS8.1地震有响应的数字水位资料,分析其同震响应特征,探讨响应机理。结果显示,17个水位测项中10个有同震响应;水位同震响应形态类型有三种:振荡型、振荡-阶变型、脉冲型;含水层岩性为灰岩和安山玢岩的井孔,其水震波的振荡幅度较大;对于振荡-阶变型同震响应形态的井孔水位总是先记录到振荡,然后才是阶变;各井孔水位对尼泊尔地震的响应时间快慢有很大差距,这主要是由各观测井仪器的时间服务系统走时差不等造成的;数字水位的振荡幅度上下不对称,可能是因为仪器的采样率低引起的。井孔水位同震响应后效残留阶升意味着压应力的增强及地震危险性的增加;未记录到地震的观测井可能与井孔结构及所处的构造部位有关。
The digital water level data in response to the MS8.1 earthquake in Nepal were collected and analyzed. The characteristics of coseismic response were analyzed and the response mechanism was discussed. The results show that 10 of the 17 water level measurements have coseismic responses; there are three types of water level coseismic responses: oscillation type, oscillation-step type and pulse type; aquifer lithology is limestone and andesite well The oscillation amplitude of water shock waves is larger. For wellbore-water level coseismic response, the wellbore water level is always first recorded to the oscillation and then to the step change. The response time of each well water hole to the Nepali earthquake is very fast Large gap, which is mainly caused by the time difference between the time service systems of observation well instruments. The oscillation amplitude of the digital water level fluctuates up and down possibly because of the low sampling rate of the instrument. Wellbore water level coseismic response After-effect residual step-up implies an increase of compressive stress and an increase of seismic risk. Observation wells that have not recorded the earthquake may be related to the well bore structure and the structural site in which it is located.