不同力源作用下云南中西部构造运动和应力场特征

A STUDY ON CURRENT STRESS FIELD AND SEISMIC DANGER AREAS IN THE CENTRAL-WESTERN YUNNAN PROVINCE

摘要:

本文通过对红河断裂带附近水平残余应力应变场的分析和对该区用6种加力方向进行的平面有限元计算,并结合有关资料讨论了该区现今应力场及其地震危险性。结果表明:该区现今构造应力场较为复杂,且有明显的分区特点,但其最大主压应力的优势方位为近南北。永胜附近,剑川-洱源一带,大理、下关、宾川所围地区是该区未来地震的危险区。当主压应力轴偏向北西时,永平一带,兽洱-思茅一带,峨山、石屏、通海一带也可能发展成为未来地震的危险区。

Abstract:

In this paper, based on the analysing of horizontal remnant stress-strain fields near the Red River fault, the calculation of 2-D finite element method with six different tectonic stress directions, and other related data, the current stress field and the seismic danger areas are inferred. The results indicate that the current stress field in this area is very complex and shows regionalized features, but the dominant direction of principal compressive stress is nearly NS. The Yongsheng area. Jianchuan-Eryuan area, and the area surrounded by Dali. Xiaguan and Binchuan are coming seismic danger areas. When the principal compressive stress axis rotates toward northwest, the Yongping, Puer-Simo, Eshan, Shiping, and Tonghai are as will become seismic danger areas.