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观测到北京一次小震级地震(ML=3.0)前的异常声-重力波,并同时记录到异常地表倾斜信号。二者相关系数比较高,在接近震中的地区相关系数达到最大值0.5,相关系数随着远离震中的距离增大而减小。经过研究表明,异常声-重力波的产生与震前的地表缓慢活动引发的山体缓慢晃动导致的气流风速波动变化有关。基于350 m高的气象铁塔观测的风速数据,对两层大气模型传播的声-重力波进行了数值计算,得到的相对山体非平稳气流引起的声-重力波与观测信号在特征周期、幅度和速度三个参数上近似。以地表倾斜为例的模型与观测数据的一致性表明该震前声-重力波与地震存在关联性。
Anomalous acoustic-gravitational waves before a small magnitude earthquake (ML = 3.0) in Beijing were observed and anomalous surface tilt signals were also recorded. The correlation coefficient between the two is relatively high, and in the area close to the epicenter the correlation coefficient reaches the maximum of 0.5, and the correlation coefficient decreases as the distance away from the epicenter increases. The research shows that the generation of anomalous acoustic-gravity waves is related to the fluctuation of the wind velocity caused by the slow shaking of the mountain caused by the slow earthquakes before the earthquake. Based on the wind speed data of the meteorological observation tower with a height of 350 m, the acoustic-gravity waves propagating in the two-layer atmospheric model are numerically calculated. The results show that the acoustic-gravity waves and the observed signals caused by the non- Approximate speed of the three parameters. The coincidence between the model and the observed data, taking the slope of the earth’s surface as an example, shows that there is a correlation between the acoustic-gravity wave and the earthquake before the earthquake.