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根据西藏札木和当雄地区区域地震观测资料,用平滑小震初动的方法得到了这两个地区的平均应力场,结果是: 1.当雄地区及札木的A区主压应力方向大体上为南北向,仰角较小,分别为23°和14°,说明两板块之间以水平挤压为主。 2.在札木的B区,主压应力方向为东西向,仰角为51°,说明和俯冲的情况相对应。 这一结果与印度板块和欧亚板块互相挤压碰撞的模式基本上一致,说明了此地区无论大震小震郁受板块构造力的控制。
According to the seismic data of Zhaomu and Dangxiong areas in Tibet, the average stress field in these two areas is obtained by the method of initial smoothing small earthquakes. The results are as follows: 1. The direction of main compressive stress in area A of Dangxiong and Zaomu North-south, elevation angle smaller, respectively, 23 ° and 14 °, indicating horizontal extrusion between the two plates. 2. In Zone B of Zaomu, the principal compressive stress direction is east-west and the elevation angle is 51 °, indicating that it corresponds to the situation of subduction. This result is basically consistent with the mode of squeezing collision between Indian plate and Eurasian plate, indicating that the area is under the control of plate tectonic force regardless of the magnitude and magnitude of the earthquake.