用小震应力降估算滇西地区深部绝对应力值

本文用小震应力降估算了滇西地区5～8公里深的水平应力绝对值,并和剑川、下关地区的水压致裂结果进行了对比,发现两者是可以相比的。估算水平应力值随深度的增加而增加,线性相关的可信度较高。结果表明,由应力降估算绝对应力值是一种可行的办法,关键在于应力降结果的可靠性及震源定位精度的提高。

THE ABSOLUTE DEEP STRESS VALUES INWESTERN YUNNAN ESTIMATED FROM STRESSDROPS OF SMALL EARTHQUAKES

In this papr, the absolute horizontal stress values at a depth of 5 - 8 km in Western Yunnan have been estimated from stress drops of small earthquakes, which have been compared with the hydraulic fracturing result in Jianchuan and Xiaguan areas, showing a comparison between the two. The estimated stress values inerease with depth, appearing a high reliability of linear correlation.The obtained result indicates that it is an applicable way to estimate the absolute stress value from stress drops, with a key point of reliable stress drops and precise source locations.