摘要
本文根据分布在甘肃省河西地区14个电磁波台站近6年来的观测资料,分析了近几年来发生在甘肃省及邻近地区的11个Ms4.0以上地震的电磁波异常特征。结果表明,震前电磁波异常信号主要有低频脉冲和阵发性脉冲两类;异常信号出现的时间强度与地震的大、小及距离远近有关,震级大、距离远的地震信号出现的时问早、幅度大;震源浅的地震异常信号强,累计持续时间长,其信号呈脉冲形式,震源深信号相对较弱,并显示低频脉动特征;震前电磁波异常信号呈现密集-平静-发震的过程。
Based on the observed data of electromagnetic wave of recent six years at 14 stations in Hexi corridor of Gansu Province, this paper analyses the characteristics of electromagnetic wave anomalies before 11 earthquakes (Ms≥4.0) occurred recently in Gansu province and its vicinities.The results show that the anomalous signal of electromagnetic wave mainly has two kinds: low-frequency pulse and paroxysmal pulse; The time appearing anomalous signal and intensity are related to magnitudes and epicentral distances. The greater the magnitude and the nearer the epicentral distance, the earlier the time appearing anomalous signaliis and the bigger the amplitude is; The anomalous signal of shallow earthquake is stronger, and appears pulse form; For deep earthquake the signal is weak relatively, and appears low-frequency pulsation.The anomalous signal shows a process of concentrated-calm-earthquake triggering.
出处
《西北地震学报》
CSCD
1993年第4期36-44,共9页
Northwestern Seismological Journal
关键词
中强地震
电磁波异常
地震前兆
Gansu
Mid-Strong Earthquake
Electromagnetic Wave Anomaly
