Abstract:Based on the earthquakes recorded from Shanxi digital seismic network in 2001—2010, we study the seismic activity in Linfen region in order to look for repetitive microtremors, and then calculate the rate of deep sliding along faults., The earthquake image after relocating by using double-difference method shows that more than 29.3% earthquakes during the study period occur on both sides of Subu fracture in the hinterland of Linfen Basin plain, namely the Linfen-Hongtong secondary depression, which distributed between south, middle and north three uplifts along NNE. Focal depth distribution and deep structure in the study area is relatively consistent. Through waveform cross-correlation analysis, we identify 25 groups of similar pair of earthquakes and 49 groups of multiple similar pair with high waveform similarity. Most similar seismic activities are characterized by aperiodic, with recurrence intervals ranging from several minutes to several hundred days. Based on the records in the same seismic station, we firstly create reference seismic waveform, which is used to measure the S—P relative arrival time difference of each earthquake relative to the reference one, and then determine the relative distance of each earthquake to the center of mass of multiple similar pair, so that to pick out the recurring events in each group of earthquakes. Finally we identify 2 groups of repeated earthquakes in the study area, and estimate the sliding rate of 1.9~2.8mm/a, which is basically similar to that from surface observations such as GPS and geological survey at the same period.