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为研究普洱-宁洱地区强震频发与构造应力场和变形场的相关性,以1997—2007年GPS数据计算得到的云南普洱-宁洱块体年运动量为边界约束,建立云南普洱-宁洱地区包含红河断层及澜沧江断层等10个断层的三维摩擦接触有限元模型,计算在GPS年运动速率约束下棋盘式构造格局的变形位移场、应变场及应力场分布,并将计算结果与GPS计算结果进行比较。通过计算发现:普洱-宁洱断层群会使澜沧江及红河断层包围区域变形及应力场更复杂,普洱-宁洱地区复杂变形及应力场可能是该地区中强地震频发的主要原因;镇远-普洱断层可能是影响普洱-宁洱地区变形及应力场的主要断层;普洱-宁洱地区走向共轭断层交汇处,存在较大变形及应力值;变形场与应力场会随断层走向变化而发生变化,在断层走向变化剧烈部位有较大值。
In order to study the correlation between strong earthquakes and tectonic stress field and deformation field in Pu’er-Ning’er area, the annual movement of Pu’er-Ning’er block in Yunnan from 1997 to 2007 was calculated as the boundary constraint and the Yunnan Pu’er-Ning The three-dimensional frictional contact finite element model of 10 faults such as Honghe fault and Lancangjiang fault is included in the Er region. The deformation and displacement field, strain field and stress field distribution of the chessboard pattern under the annual velocity of GPS are calculated, and the results are compared with GPS Calculation results are compared. The calculation shows that the Pu’er-Ning’er fault group will make the deformation and stress field more complicated in the area surrounded by the Lancang River and Honghe fault, and the complex deformation and stress field in the Pu’er-Ning’er area may be the main reason for the frequent earthquakes in this area. Zhenyuan- The Pu’er fault may be the main fault that affects the deformation and stress field in the Pu’er-Ning’er area. There is a large deformation and stress value in the confluence of the Pu’er-Ning’er area to the conjugate fault. The deformation and stress fields will occur along with the strike of the fault Changes in the dramatic changes in the direction of the fault location has a larger value.