霍山窗中小地震视应力的时空特征研究

摘要

Based on digital seismic waveform data from 2000 to 2016 recorded by Anhui network, the paper estimates the apparent stress level in "Huoshan Seismic Window" region, and concludes that average stress is 0.010 8 MPa, which is the background stress level of the region. Meanwhile, the paper analyzes the spatial and temporal characteristics of earthquakes that meet the magnitude and distance conditions in East China since 2000. The results show that: apparent stress in "Huoshan Seismic Window" have four groups high value anomaly within two years, three corresponding earthquakes occurred in East China, and it is inferred that there may be some correspondence between the apparent stress level and the moderate strong earthquakes in East China; the spatial distribution of apparent stress in "Huoshan Seismic Window" show that the high value area mainly is mainly located in the Mozitan-XiaoTian fracture, and is close to the intersection area of Mozitan-XiaoTian fracture and Luoerling-Tudiling fracture, which deserves further attention.%利用安徽台网记录的2000-2016年数字化地震波形资料,对"霍山窗"地区视应力水平进行估计,反演分析得出视应力平均为0.0108 MPa,以此作为该区域的背景应力水平;同时,通过对华东地区2000年以来符合震级和距离条件的地震进行时空特征分析,发现:①在"霍山窗"出现4组视应力高值异常之后的2年内,华东地区有3次发生了对应地震,以此推断"霍山窗"中小地震视应力水平与华东地区中强震可能存在着一定的对应关系;②"霍山窗"视应力空间分布显示高值区主要位于磨子潭-晓天断裂,靠近磨子潭-晓天断裂与落儿岭-土地岭断裂交汇区域,值得进一步关注.