%0 Journal Article %T 1833年云南嵩明8级地震震中区地震密集特征分析 %T Seismic Density around the Epicenter of the Songming M8.0 Earthquake in 1833 %A 张哲 %A 王健 %A Zhang Zhe %A Wang Jian %J 中国地震 %@ 1001-4683 %V 34 %N 2 %D 2018 %P 303-311 %K 地震密集值;历史地震;地震活动性;云南省 %K Seismic density;Historical earthquake;Seismicity;Yunnan Province %X 1833年云南省昆明市嵩明杨林地区发生了1次强烈地震,震级被定为8级,这也是迄今为止云南省震级最大的地震。本文选取该地震震中一带为研究区(24.7°~25.5°N,102.3°~103.3°E),采用网格点密集值计算方法对研究区1966年以来仪器记录的地震进行了计算。根据地震密集等值线图确定研究区有2个地震密集区。通过不同的时窗分析了密集区内地震活动的时间分布特征。利用地震密集时空分布特征与历史强震间的关系,给出了1833年嵩明8级地震震中位置校正的建议。此外,还通过地震密集时空动态变化分析发现,21世纪以来研究区地震密集由NE逐渐向SW方向发展。该现象可能在一定程度上反映出区域应力的变化特征。 %X A strong earthquake happened in 1833 around Songming with M 8.0,which has been the largest one in Yunnan Province so far. In this paper,we have researched the seismicity around the epicenter of the M8.0 earthquake(24.7°~25.5°N,102.3°~103.3°E). The method of seismic density calculation has been utilized to deal with the seismic pattern of small and middle earthquakes recorded by instruments since 1966. Based on seismic density contours,two seismic density zones are identified. The temporal distributions of earthquakes in the two seismic density zones are analyzed in different time windows. According to the relationship between the seismic density and the parameters of strong historical earthquakes,the emendation of the epicenter of the 1833 M8.0 earthquake is suggested. Spatial-temporal dynamic patterns are analyzed. The results show the seismic density zones start from NE and develop to SW direction since the new century. This variation might illustrate the fluctuation of regional stress to some extent. %R %U http://zgdz.eq-j.cn/zgdz/home %1 JIS Version 3.0.0