一、问题的提出 1933年叠溪7.5级大震的发震断层,虽已确认是沿北西方向展布的松平沟断层,但文章的作者们又指出“真正的地震断层我们没有见到,估计可能为从叠溪到松平沟一线的滑坡体所掩盖”。笔者利用航、卫图象的优、特点对叠溪地区的航卫图象作综合判释,并结合野外地表地质的实际情况,就这次地震的发震构造和极震区范围提出一点看法。 I. PROBLEM PROBLEMS Although the seismogenic fault of the Diexi 7.5 earthquake in 1933 has confirmed the Songpinggou fault spreading along the northwest direction, the authors of the article also pointed out that “we did not see any real earthquake fault, May be masking the landslide body from the Cascade Creek to the Songping ditch. ” The author makes use of the advantages and disadvantages of the navigation and satellite imagery to make a comprehensive judgment of the navigation and defense image in Diexi area and put forward some opinions on the seismogenic structure and the range of the extremely seismic zone in this field combined with the actual situation of the surface geology in the field .