基于双差定位法的“霍山窗”中小地震精定位

Fine Location of Small and Medium Earthquakes in Huoshan Window Based on Double Difference Method

基于地震双差定位法,对霍山区域测震台网所记录的2011—2015年期间,本地59次Ml≥1.0地震进行重新精定位,得到了57条地震定位结果。精定位结果显示:一方面提高了地震的定位精度,从精定位结果来看,其分布更加集中;另一方面震源深度分布更精准、科学、合理,原定位震源深度多位于5.0~7.0km之间,精定位震源深度分布于5.5~6.5km之间,近似正态分布。最后,震中位置与震源深度变化较大的震例,呈现向青山~晓天断裂和北东向落儿岭~土地岭断裂靠近的现象,体现了断裂带的运动构造特征,地震活动更加符合断裂带分布的特点。

Based on the seismic double-difference positioning method,the local 59 earthquakes with Ml≥1.0 recorded in the Huoshan regional seismographs network were repositioned precisely during 2011—2015,and 57 seismic positioning results were obtained.The result of precise positioning shows that,on the one hand,the positioning accuracy of earthquake is improved,and its distribution is more concentrated.On the other hand,the source depth distribution is more accurate,scientific and reasonable.The original source depth is mostly located between 5.0~7.0km.The precise location of the source depth distribution is between 5.5~6.5km,approximately normal distribution.Finally,the earthquake cases with great changes in the location of the epicenter and the depth of the source were closer to the Qingshan-Xiaotian fault and to the North-Luoerling-Landling fault,which reflected the moving structural characteristics of the fault zone,and the seismic activity was more consistent with the characteristics of the distribution of the fault zone.