HIGH FREQUENCY GEOSOUND IN THE EPICENTRAL REGION

The geosound observation station has been set up in the epicentral region.High frequency geosoundsignals have been detected by means of anticlutter processing and the high frequency response characteristicof the geophone.Further analysis indicates that these signals are impulsive with weaker energy.The shortestduration of geosound impulse is only of the order of millisecond and the highest dominant frequency ishigher than 1kHz.The high frequency signal thus detected may represent the important feature of geosoundin the epicentral region.     

震中区震前的高频地声

在近震区建立地声观测站,利用地听器的高频响应特征和对信号的抗干扰处理,结果发现了震前高频地声的存在。进一步分析表明,这些信号是一些能量较弱的脉冲型信息。其持续时间仅为ms的数量级,而最高的优势频率则超过1000Hz。该信息可能是震中附近地区地声的重要特征。