2013年8月12日5时23分在西藏自治区昌都地区发生了一次Ms6．1级地震，震中位于北纬30．1°，东经97．9°。根据震后现场考察结果，宏观震中位于昌都地区左贡县嘎益村附近的澜沧江断裂带上，震中最大烈度为Ⅷ度，但考察点仅是点状分布的，因此无法按照理想图形选择出调查点而绘出烈度分布图。根据有限的调查点资料绘出地震烈度等震线为椭圆形，长轴走向为北西向，与澜沧江断裂带走向一致。本次地震的宏观震中就位于该断裂上，严重震害点也沿该断裂带分布，震源机制解表明发震断层为NWW向，结合宏观考察分析表明，澜沧江断裂带为本次地震的发震构造。%The 2013 Ms6. 1 Zuogong Earthquake occurred at 5:23 on 12 August 2013 in Zuogong County, Xizang Autonomous Region. The epicenter is 30. 1° N,97. 9° E. The macroscopic epicenter is located near the village of Gayi, Zuogong country, where the Lancangjiang Fault extended. The maximum seismic intensity is 8 degrees. But the 8 degrees do not form an ellipse region due to the less survey points. The major axis direction of the isoseismal map is a NW-trending which is the same with Lancangjiang fault zone. The area of disaster region is about 9 233 square kilometers. According to the historical recordings, several earthquakes with magnitude of about 6 occurred along the segment from Changdu to Yanjing of Lancangjiang Fault. According to the focal mechanism solution, the strike of seismogenic fault is NWW. The seismogenic structure of the Zuogong Earthquake is the Lancangjiang Fault.
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