2020-01-19伽师6.4级地震前后视应力变化

Temporal-Spatial Variations of Apparent Stress before and after the January 19,2020,Jiashi M_(S)6.4 Earthquake

柯坪块体中强地震频发,为获得更多的震情判定依据,利用新疆区域地震台网提供的数字地震学波形资料,计算柯坪块体2010~2020年M_(L)≥3.0地震的视应力值,讨论震源参数的标度关系,并分析柯坪块体5.0级及以上地震和伽师6.4级地震前后视应力的时空变化特征。结果表明,视应力和震级呈正相关关系;柯坪块体5.0级及以上地震前,视应力值在时间和空间上均出现不同程度的高值异常;伽师6.4级地震发生在视应力高值过程中,且震前5个月在震中区出现视应力高值异常。

Moderate to strong earthquakes occur frequently in Keping block.To obtain more judgement basis of earthquakes,based on the earthquake data recorded by Xinjiang Digital Seismic Network,we calculate the apparent stress of M_(L)≥3.0 earthquakes occurred in Keping block from 2010 to 2020.We discuss the scaling relationship of source parameters and analyze the temporal-spatial variations characteristics of apparent stress before and after M≥5.0 earthquakes and Jiashi M_(S)6.4 earthquake.The results show that the apparent stress is positively correlated with magnitude.The apparent stress values show different degrees of temporal and spatial high anomalies before M≥5.0 earthquakes in Keping block.The Jiashi M_(S)6.4 earthquake occurred in the process of high apparent stress,there was an abnormal area of high apparent stress in the epicenter area five months before the earthquake.