Abstract We obtain the seismic-source spectral parameters of seismic energy, corner frequency, seismic moment and apparent stress by spectral analysis of small and medium earthquakes in Shizhu and Wulong areas. We comparatively analyze the differences of seismic-source spectrum parameters of the Shizhu M4.5 earthquake and the Wulong M5.0 earthquake. The results show: 1) Corner frequency and apparent stress in Shizhu area are lower than that in Wulong area under the same magnitude conditions, which may be related to the closer distance from Shizhu to the Three Gorges Reservoir area. 2) The apparent stress in Shizhu area presents two years rising process, decreasing slightly before the main shock, and corner frequency also increasing before the earthquake. 3) The apparent stress in Wulong area presents abnormal changes of “rise-descent-rise” before the Shizhu M4.5 and the Wulong M5.0 earthquakes, and corner frequency also increases before the two earthquakes. 4) The apparent stress of the whole study area has undergone an ascending change process before the Shizhu M4.5 and the Wulong M5.0 earthquakes, and the stress in this area remains high after the earthquakes.
CHEN Lijuan,GONG Liwen,DONG Di et al. Comparison of Apparent Stress Anomalies between Shizhu M4.5 Earthquake and Wulong M5.0 Earthquake in Chongqing[J]. jgg, 2021, 41(3): 249-253.
CHEN Lijuan,GONG Liwen,DONG Di et al. Comparison of Apparent Stress Anomalies between Shizhu M4.5 Earthquake and Wulong M5.0 Earthquake in Chongqing[J]. jgg, 2021, 41(3): 249-253.