基于地震信号的滚石定位及动力参数反演研究

Rolling stone positioning and dynamic parametric inversion based on seismic signals

基于滚石诱发地震信号可快速准确地获取滚石灾害信息,对灾情评估至关重要。开展了滚石冲击坡面地震动监测现场原位试验,揭示了滚石冲击地震信号时频域特征规律,分析了到时法与极化法的震源定位性能,并基于量纲分析法建立了滚石体积与冲击速度反演模型。结果表明:滚石冲击坡面(弹跳阶段)产生的地震信号表现为短持时、宽频带的三角状脉冲特征;结合到时法和极化法震源定位理论,实现了滚石冲击坡面的空间定位,得出到时法是更为优良的滚石冲击震源定位方法,其平均相对定位误差不超过10%;基于无量纲反演模型预测的滚石体积、冲击速度与实际结果吻合较好,平均预测误差均低于20%。研究成果可为滚石灾害动力学参数的快速获取提供理论与技术支持。

Based on seismic signals induced by rolling stones being able to quickly and accurately obtain information of rolling stone disasters,the information is crucial for disaster assessment.Here,in-situ tests to monitor ground motion were conducted on rolling stone impact slopes to reveal time-frequency domain characteristics of rolling stone impact seismic signals,analyze the source positioning performance of the arrival time method and polarization method,and establish a rolling stone volume and impact velocity inversion model based on dimensional analysis method.The results showed that seismic signals generated by impact of rolling stones on slope during bouncing stage exhibit triangular pulse characteristics of short duration and wide frequency band;by combining theories of arrival time method and polarization method for seismic source positioning,spatial positioning of rolling stone impact slope is realized,and the arrival time method is considered to be a better method for seismic source positioning of rolling stone impact with an average relative positioning error of no more than 10%;rolling stone’s volume and impact velocity predicted based on the non-dimensional inversion model agree better with the actual results,and the average prediction error is less than 20%;the study results can provide theoretical and technical support for rapid acquisition of dynamic parameters of rolling stone disasters.