南北地震带中段地震构造遥感解译

Seismotectonic interpretation along central section of Chinese North-South seismic belt from ETM image

南北地震带中段断裂在遥感影像上具有明显的线性构造特征,本中研究区域为东昆仑断裂带与龙门山断裂带的交接区,该区断裂从遥感影像上分析主要有NW向、NE向、SN向三组,包围着岷山隆起近似成三角形。交接区内构造复杂,曾发生1879年武都8级地震、1933年叠溪7.5级地震、1976年松潘7.2级地震等强震。通过遥感资料对该区断裂进行构造解译,确定该区构造活动型式及地震构造特征。

Distinct linear tectonics on the RS images showed the faults of the North-South seismic belt. In this paper, we studied the intersection area of East Kunlun fault and Longmenshan fault belts. By carefully interpreting the ETM images, we discovered three main faults of NW, NE and NS trending surround the Minshan Mountain roughly forming a triangle. Structures in this area are complicated, there are several strong earthquakes happened such as Wudu earthquake （1879, M8. 0）, Diexi earthquake （1933, M7. 5）, Songpan earthquake （1979, M7.6）. In this paper we tried to interpret the faults along this section and to study the characteristics of tectonic activity and Seismotectonics.