利用高分影像识别门源MS6.9地震地表破裂带

北京时间2022年1月8日，青海省门源县发生了M_S6.9地震，震中位于冷龙岭断裂西端与托莱山断裂过渡区。地震发生后，文章利用亚米级分辨率的高分7号卫星影像对本次地震产生的地震破裂带进行详细解译，并与野外调查结果进行对比，获得此次地震地表破裂带分布及组合特征。结果显示，此次地震形成两条破裂带，长度分别约21 km和5 km,分别沿冷龙岭断裂西段和托莱山断裂东段展布。地震破裂带由一系列雁列式地震裂缝、挤压鼓包及拉张凹陷组成，破裂带组合特征反映出发震断裂明显的左旋走滑特征，但利用影像并未识别出同震位错等定量数据。在此基础上，文章对比冷龙岭断裂东段存在的历史地震破裂带，讨论了冷龙岭断裂未来地震危险性问题。

Recognition of surface ruptures of Menyuan MS6.9 earthquake using GF images

On 8 January, 2022, an earthquake (M_S6.9) occurred in Menyuan County, Qinghai Province. The epicenter was located at the junction of the western end of the Lenglongling fault and the Tuolaishan fault. After the earthquake, we used the high-resolution GF-7 satellite images to interpret the seismic surface ruptures produced by the earthquake in detail. The results were then compared with the field investigation results, and the distribution and combination characteristics of the surface ruptures were obtained. The results showed that two surface ruptures with a length of about 21 km and 5 km are formed during the earthquake. They are distributed along the western segment of Lenglongling fault and the eastern segment of Tuolaishan fault, respectively. The surface ruptures are composed of a series of en-echelon seismic fractures, compression mole tracks, and tension depressions, showing obvious left-lateral strike-slip characteristics. Unfortunately, quantitative data such as coseismic offsets were not recognized by satellite images. Furthermore, the historical surface ruptures in the eastern segment of the Lenglongling fault were compared and the seismic risk of the Lenglongling fault in future was also discussed.