2021年漾濞MS 6.4地震云南数字化井水位同震响应特征分析

通过对漾濞M_S 6.4地震云南数字化井水位分钟值数据同震响应特征进行分析，分析观测仪器采样率对井水位映震能力的影响，并对水位同震响应机理进行初步分析。结果表明，对于漾濞M_S 6.4地震，13口同震响应观测井主要分布在震中距200 km范围内的红河断裂带北侧和小滇西地区；同震响应形态可分为阶升（上升）型、阶降（或缓降）型、阶变（阶升、阶降）—复原型等3种变化类型，阶升型同震响应幅度相对大于其他2种类型；由漾濞M_S 6.4地震烈度长轴和短轴共同划定的椭圆区域来划分此次地震静态应力和动态应力的影响范围，可以从各观测井受力状态初步分析水位同震响应变化形态的力学机理；在静态应力影响范围内，井水位同震响应主要表现为阶升变化；在静态应力影响范围以外，除以阶变（阶升、阶降）—复原变化为主外，还有阶降（缓降）、阶升变化。观测仪器采样率对井水位映震能力的影响较大，水位秒钟值数据的同震响应变化形态更加完整，但目前水位秒钟值数据的收集和使用都还在不便之处，这种情况有待改进。

Analysis of co-seismic response characteristics of digital well water level caused by 2021 Yangbi MS 6.4 earthquake in Yunnan Province

Based on the analysis of the characteristics of co-seismic response of digital well water level minute data in Yunnan Province caused by Yangbi M_S 6.4 earthquake, the influence of the sampling rate of the observation instrument on the seismic recording ability and the mechanism of the co-seismic response of the water level are discussed. The results show that the 13 co-seismic response observation wells of Yangbi M_S 6.4 earthquake are mainly distributed on the north side of the Red River fault zone and the area in the west of Yunnan province within 200 km from the epicenter. Co-seismic response can be divided into three types: step up (ascend), step down (descend), and step change (step up, step down)-restores. The co-seismic response amplitude of step-up type is relatively larger than the other two types. The influence range of static stress and dynamic stress of Yangbi earthquake is divided by the ellipse region determined by both the long axis and the short axis of Yangbi earthquake intensity, the mechanical mechanism of water level co-seismic response variation can be analyzed from the stress state of each observation well. In the influence range of static stress, the co-seismic response of well water level mainly shows step-up variation, and outside the influence range, there are step-down (slow-down) and step-up variation besides mainly step-up variation (step-up, step-down). The sampling rate of the observation instrument has a great influence on recording seismic capability of the well water level, and the co-seismic response change pattern of the second value data of the water level is more complete, however, it is not convenient to collect and apply.