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2013年8月28日、31日,云南迪庆藏族自治州香格里拉县、德钦县、四川省甘孜藏族自治州得荣县交界地区连续发生5.1级、5.9级地震.为了查明此次地震的影响破坏程度,进行了地震现场建筑物震害考察并对震中附近断裂进行了野外构造地质剖面调查.两次地震在短时间内并在相近位置连续发生,造成了此次云南香格里拉、德钦-四川得荣交界地震比以往同级地震的破坏程度要高,地震烈度最高为Ⅷ级,有感范围大,5.9级地震宏观震中大致处在整个灾区破坏最严重的奔子栏镇争古村一带(28.20°N,99.36°E),距离地震微观震中约5.1km.等震线沿德钦-中甸断裂呈北西向分布,近似为椭球状,结合此次地震震中附近区域现场断裂调查、震源机制解数据以及地震余震空间分布特征,初步推断此次地震的发震构造为德钦-中甸断层,其主要表现为一次以正断为主兼有左旋走滑错动的地震事件.
On August 28 and 31, 2013, 5.1 and 5.9 earthquakes occurred consecutively in Shangri-La County, Deqin County, Diqing Tibetan Autonomous Prefecture, Yunnan Province, and at the junction area of Derong County, Ganzi Tibetan Autonomous Prefecture, Sichuan Province. In order to find out the impact of the earthquake , Carried out seismic site building seismic damage survey and field tectonic geological survey of the fault near the epicenter.The two earthquakes occur in a row and in a similar place in a short time, resulting in the Yunnan Shangri-La, Deqin - Sichuan Derong The boundary earthquakes have a higher degree of destruction than previous earthquakes of the same level, with the highest seismic intensity of Ⅷ level and a large range of senses. The macroscopic epicenter of the M5.9 earthquake is generally located in the stricken area of Zhuangzi Village (28.20 ° N , 99.36 ° E) from the microseismic epicenter of the earthquake about 5.1 km. The isochord along the northwest of the Deqin-Zhongdian fault is approximately ellipsoid. Combined with the field fault investigation in the vicinity of the epicenter of the epicenter, focal mechanism solution data and According to the spatial distribution of aftershocks, it is initially concluded that the seismogenic structure of this earthquake is the Deqin-Zhongdian fault, which is mainly characterized by a seismic event dominated by normal faulting and left-lateral strike-slip .