Abstract：Using the seismic waveform data since 2009 in southern Jiangxi and its adjacent areas, wecalculate the apparent stress of 249 ML1.8 to 4.0 earthquakes and calculate b-value using the earthquake catalogue since 1978. The results show that the apparent stress value is between 0.002 to 2.070 MPa, and the average value is 0.152 MPa. From the time variation of apparent stress with ML2.0 to 2.9 earthquakes, three of the five ML≥3.5 earthquakes (aftershocks removed) show high b-value anomalies since 2009. From the perspective of spatial distribution, ML≥3.0 earthquakes occur in the region of high apparent stress and near the boundary between high and low values. The apparent stress is positively correlated with the magnitude. The minimum magnitude of completeness in the study area is ML2.0 since 1978, and the b-value is 0.78; since 2009, most of ML≥3.0 earthquakes occur in the low b-value region or near the edge. The low b-value region is close to the high apparent stress region, which reflects the high seismicity and crustal stress state.
TANG Lanrong,ZENG Xinfu,GUO Yufan et al. Analysis of Temporal and Spatial Characteristics of Apparent Stress in Southern Jiangxi and Its Adjacent Area[J]. jgg, 2022, 42(7): 675-679.
