论文部分内容阅读
本文以野外观测资料为基础对长沙地区第四纪断裂进行了研究,指出本区有两组第四纪断裂,一组为北北东向,另一组为近东西向,前者均发育在早更新世地层中,后者均发育在中更新世地层中,其力学性质均为张性或张剪性,正断层,断距从数十厘米至10m不等。从第四纪断点分布的成带性推测长沙中部、湘江东岸分别存在近东西向和北北东向的第四纪断裂带,它们可能还有一些活动,目前属于大面积拱隆上升运动性质,断裂活动能量有限,很难导致六级以上地震的发生。
Based on the field observation data, this paper studies the Quaternary faults in Changsha area, pointing out that there are two Quaternary faults in this area, one is north-north eastward and the other is near-east-west, both of them developed early In the Pleistocene strata, the latter are all developed in the Middle Pleistocene strata, and their mechanical properties are all tensile or shearing. The normal faults and the fault ranges from tens of centimeters to 10 meters in length. Based on the zoning of the Quaternary fault distribution, it is speculated that there are near-EW and NE-trending Quaternary faults in the central part of Changsha and the east of the Xiangjiang River, respectively. They may have some activities, which are currently large-scale arboretum ascending movements The nature of the fault activity energy is limited, it is difficult to cause more than six earthquakes.