【摘要】 本文通过对我国西南地区以及相邻的越南、缅甸北部地区的51个地震的震源机制结果和10个地震破裂带资料的力学分析,讨论了我国西南地区现代构造应力场分区及现代构造活动特征。并得出由鲜水河断裂带、安宁河断裂带、小江断裂带、通海曲江断裂带和红河断裂带所围成的一个不封闭菱形地块相对外围区域有向南南东移动的趋势。此菱形地块控制着我国西南地区的主要地震活动。更多还原

【Abstract】 Based on the analysis of the focal mechanism solutions of 51 earthquakes occur-ing in Southwestern China and geological data of 10 earthquake fault zones of the region, we discuss in this paper, division of the present tectonic stress field in Souh-western China into separate regions and their relation to the recent tectonic activity.It has been found that a tectonic block in the shape of an inclosed rhomb bounded by the Xianshuihe (鲜水河), Anninghe (安宁河), Xiaojiang (小江), Qujiang (曲江) and Red River on the east, south and southwest, is moving southeastward relative to the surroundings. This rhmobic block controls the occurrence of most of the earthquakes in this area.更多还原