On temporal and spatial distribution of seismic apparent stresses in Yunnan area

摘要: The method of radiation energy (E R) the earthquake wave measured by peak velocity (r·v) ground motion is applied to a detailed study on temporal and spatial distribution seismic apparent stresses (σ a) for moderate small earthquakes two aftershock sequences in Yunnan area. results show that there exists an obvious non-homogeneity distribution. concentrated regions high are related active places earthquakes. Before Dayao M=6.2 earthquake, was period which were value 5 times average value, 0.25 MPa. relatively values distribute around epicentral area major shock nearby. It indicates variation characteristics can be taken as new kind criterion earthquake-risk forecast. Usually ratio sequence σ aA ones aM main less than 1.0.