上海及邻近地区介质参数的研究  

THE RESEARCH OF THE MEDIUM AND SOURCE PARAMETERS IN SHANGHAI AND ITS ADJACENT REGIONS

作　　者：李平[1] 徐永林[1] 张丽娟[1] 

机构地区：[1]上海市地震局,中国上海200062

出　　处：《地震地磁观测与研究》1992年第6期20-30,共11页Seismological and Geomagnetic Observation and Research

摘　　要：在频率域里研究了上海及邻近地区的Q值、小震震源参数,初步得到如下结果:①以上海佘山为中心,平均直达P波Q值呈方向性分布。在相同震中距下,上海西面溧阳方向(?)值较高,上海北部南黄海方向(?)值较低;溧阳和南黄海地震活跃区域的(?)值比其邻近地震相对不活跃区域的偏高,②相同震级的地震相比之下,上海—溧阳方向的地震破裂尺度小,上海—南黄海方向的地震破裂尺度大;并且震级在2.5—4.0级之间的地震,破裂尺度的数值溧阳的比较集中,南黄海的则比较离散。We studied the distribution of the Q values and the source parameters of mi- nor earthquakes in Shanghai and its adjacent regions.The primary results are as follows: The average Q values for direct P-wave has various values in different direc- tions towards Sheshan station.The Liyang area to the west of Shanghai has a higher Q-value than the Nanhuang sea area to the north of Shanghai.The Q va- lues in active earthquake areas(Liyang and Nanhuang sea)is higher than that in adjacent other areas where the earthquake activity is weak. In regarding to source parameters,if the magnitude is the same,the earthquake rupture length in Shanghai-Liyang direction is longer than that in Shanghai-Nan- huang sea direction.

关 键 词：Q值 震源参数 

分 类 号：P31[天文地球—固体地球物理学]