Abstract：This paper,which compares geological background structure, earthquake sequence and various source parameters, comes to the following conclusions: 1) The 2014 M4.7 and M4.5 earthquakes are related to the northern section of the Xiannüshan fault microscopically and the nearest fault to the M4.3 and M4.1 earthquakes in 2017 is the Zhoujiashan-Niukou fault. 2) The M4.7 and M4.5 earthquakes in 2014 are rich in aftershocks with more than 500 aftershocks recorded. Among them, aftershocks of magnitude 2 and above are recorded 5 times with the maximum aftershock of M2.9 (ML3.5), with aftershocks lasting more than one month. The 2017 M4.3 and M4.1 earthquakes recorded only 160 aftershocks, including 3 aftershocks above level 2 and M2.6(ML3.3) with the largest aftershocks lasting about 20 days. 3) The best focal depth of the M4.7 and M4.5 earthquakes in 2014 is about 7 km. In 2017, the source depth of M4.3 and M4.1 is 3~5 km. 4) The dominant and corner frequencies of the main shocks in 2014 M4.7 and M4.5 earthquakes are not high; the dominant frequency is 1.5~8.0 Hz and the corner frequency is 3.0-8.0 Hz.Levels of the frequency spectrum of M4.3, M4.1 earthquakes in 2017 are mainly distributed at the dominant frequency and the corner frequency is low, suggesting fall or shallow landslide type characteristics.
