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本文根据湖北及邻区1969至1981年的地震资料,分别求解了三峡、麻城、蒲圻、丹江4个地区的小震综合断层面解。分析结果表明,湖北及邻区现代构造应力场是不一致的,其中鄂中—三峡地区主压应力为北北东—南南西向;鄂东地区主压应力为北东东—南西西向;鄂东南地区主压应力为北西西—南东东向;鄂西北地区主压应力为北西西—近东西向。这与本区Ms≥3.0地震的震源机制结果基本相符。这种不同方向的构造应力场,反映了我国华北、华南和西部地区构造应力场作用交界部位的一种特殊现象。
Based on the seismic data from 1969 to 1981 in Hubei and its adjacent areas, this paper solves the comprehensive solutions of small earthquakes in the three areas of the Three Gorges, Macheng, Puhuang and Danjiangjiang respectively. The results show that the modern tectonic stress fields in Hubei and its neighboring areas are inconsistent, of which the main compressive stress in North China-the Three Gorges area is north-north east-south-south-west direction; the main compressive stress in eastern Hubei is north-east-south-west-west; The main compressive stress is NW-SE-EHW; the main compressive stress in northwestern Hubei is NW-SEW. This is consistent with the result of focal mechanism of Ms≥3.0 earthquake in this area. This tectonic stress field in different directions reflects a special phenomenon of the tectonic stress field at the boundary between North China, South China and the western China.