西藏左贡6.1级地震烈度分布与发震构造考察
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摘要
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.
引文
[1]俞维贤,安晓文,李世成,等.澜沧江流域主要断裂断层泥中石英碎砾表面SEM特征及其断裂活动研究[J].地震研究.2002,25(3):275-280.
    [2]钟康惠,刘肇昌,舒良树,等.澜沧江断裂带的新生代走滑运动学特点[J].地质论评,2004,50(1):1-8.
    [3]李才.青藏高原龙木错—双湖—澜沧江板块缝合带研究二十年[J].地质论评,2008,54(1):105-119.
    [4]彭兴阶,王新忠,强巴扎西.藏东滇西澜沧江断裂带地质属性讨论[J].云南地质,2008,27(3):362-370.
    [5]张翼飞,段锦荪,张罡,等.滇西蛇绿岩带地质构造演化与澜沧江板块缝合线研究[J].云南地质,2001,20(4).
    [6]马晓冰,孔祥儒,刘宏兵,等.青藏高原东北部地区地壳电性结构特征[J].地球物理学报,2005,48(3):689-697.
    [7]刘宏兵,孔祥儒,马晓冰等.青藏高原东南地区地壳物性结构特征[J].中国科学:D辑,2001,31(B12):61-65.

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