九江—瑞昌地震序列的视应力变化研究  

A Study on the Variations in Apparent Stress of Jiujiang-Ruichang Seismic Sequence

作　　者：汤兰荣 杨锐[2] 杨雅琼 曾新福 周红艳 

机构地区：[1]江西省地震局,江西南昌330039 [2]河北省地震局红山基准台,河北红山054000 [3]河北省易县地震台,河北易县107421

出　　处：《华南地震》2007年第4期19-27,共9页South China Journal of Seismology

基　　金：地震科学联合基金(A07124);中国地震局"数字地震资料在短临跟踪中的应用"项目(120602-06-114)

摘　　要：利用江西数字地震台网记录到的波形资料计算了2005年11月26日九江—瑞昌MS5.7级地震序列的视应力,并对视应力与震级和深度的关系进行了讨论,结果发现视应力随着序列活动水平降低逐渐趋于平稳,ML 4.0以下的地震视应力与震级相关性较小,ML 4.0以上地震的视应力值随震级增加呈非线形快速增大;视应力大小与深度关系不明显,深度在9～12km时视应力相对要高,该范围也是整个序列震源深度的优势分布范围,视应力高值的深度范围靠近主震的震源位置。The apparent stress of the Ms 5.7 earthquake happened in Jiujiang-Ruichang region on Nov.26, 2005 has been calculated by using the waveform data recorded by the digital seismic network of Jiangxi province and then the relationship between the apparent stress and the hypocenter depth has been discussed. It is concluded that the value of the apparent stress gradually becomes more stable with the reduction of the seismic activity. The apparent stress with ML〈4.0 has less relativity with the magnitude, otherwise, the apparent stress with ML≥4.0 has non-linear increase with the magnitude. It is not obvious that is the relation between the apparent stress and the hypocenter depth. When the depth is on the range of 9-12kin, the apparent stress shows higher value. This range is also the predominance distribution for the hypocenter depth of the seismic sequence. The depth with the highest apparent stress is near the hypocenter of the main shock.

关 键 词：地震序列 震源深度 震级 视应力 九江-瑞昌地震 

分 类 号：P315.6[天文地球—地震学]