2017-06巴东Ms4.3地震序列视应力变化

摘要

采用固定台站的宽频带数字地震波形资料,计算2017-06-16巴东Ms4.3地震序列16个ML1.8以上地震的视应力、拐角频率及震源破裂半径等震源参数,并系统分析地震视应力值与各参数之间的关系.结果表明,地震序列视应力值与震级正相关,地震震源谱的高频成分不丰富,拐角频率和视应力值均远小于非水库区的构造地震,震源区地下结构较为复杂.%This paper uses the fixed stations of wideband digital seismic waveform data,and calculates the focal shock parameters of the Ms4.3 earthquake sequence in Badang county in June 16,2017.We determine focal shock parameters,including apparent stress,corner frequency and source radius,of 16 earthquakes greater than ML1.8.The relationship between the stress and the parameters is analyzed systematically.Results show that the apparent stress value and the magnitude of earthquakes are positively correlated,the seismic source spectrum of high frequency components is not rich,corner frequency and apparent stress values are far less than the tectonic earthquake,and the underground structure is more complicated in the earthquake source area.