地震学报（英文版）2006，Vol.19Issue(3)：233-242,10.
On temporal and spatial distribution of seismic apparent stresses in Yunnan area
On temporal and spatial distribution of seismic apparent stresses in Yunnan area
摘要
Abstract
motion is applied to a detailed study on the temporal and spatial distribution of the seismic apparent stresses (σa)for the moderate and small earthquakes and two aftershock sequences in Yunnan area. The results show that there exists an obvious non-homogeneity for the seismic apparent stresses in the spatial distribution. The concentrated regions of the high apparent stresses are related to the active places of the moderate and small earthquakes. Before the Dayao M=6.2 earthquake, there was a period in which the apparent stresses were high and the value was 5times of the average value, 0.25 MPa. The relatively high values of apparent stresses distribute around the epicentral area of the major shock and nearby. It indicates that the variation characteristics of the apparent stresses can be taken as a new kind of criterion for the earthquake-risk forecast. Usually the ratio of the apparent stresses of the aftershock sequence σaA to the ones σaM of main shock is less than 1.0.关键词
earthquake energy/apparent stress/seismic moment/temporal and spatial distribution/YunnanKey words
earthquake energy/apparent stress/seismic moment/temporal and spatial distribution/Yunnan分类
天文与地球科学引用本文复制引用
QIN Jia-zheng ,QIAN Xiao-dong..On temporal and spatial distribution of seismic apparent stresses in Yunnan area[J].地震学报（英文版）,2006,19(3):233-242,10.基金项目
Key project of Science and Technology from Yunnan Province (NG2001). （NG2001）
