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The 16 April 2013 Mw7.8 Ghosht, Iran earthquake

机译:2013年4月16日,伊朗Mw7.8 Ghosht地震

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On Tuesday 16 April 2013 at 10:44:22 UTC, a strong Mw = 7.8 earthquake shook not only Iran but also southwestern cities of Asia and southern Persian Gulf countries. This event occurred in a sparsely populated mountain and range region near a small town called Ghosht (located in Iran) but left destructions and causalities around the city of Mashkel in Pakistan. It was followed by a medium sized Mw = 5.7 aftershock on 17 April 2013 without any reported destructions or causalities. The regional tectonics is under the influence of multiple convergences between the Persian Gulf plate, Indian and Eurasian plates. We applied deviatoric inversion to search for the best-fitted moment tensor and dislocation grid search to illustrate the best source mechanism by grid search over double couple fault plane parameters. Deviatoric inversion found 39% of CLVD for the mainshock and 5% of CLVD for its following aftershock. This CLVD component may be related to that zone of the subduction where the sinking slab is down going under its density and cause normal mechanism. The best-fitted double couple after dislocation grid search estimated: strike 75, dip 35, rake -75 (all in degree) and Mw = 7.66, for the mainshock and strike 80, dip 40, rake -90 (all in degree) and Mw = 5.53 for its aftershock. According to seismicity distribution there exist two types of seismicity: (1) crustal seismic activity band near Makran coasts (above 50 km depth) and (2) under crustal band (between 50 km and 150 km) plus a gap of seismicity between Makran and the rest of the Persian Plateau.
机译:2013年4月16日星期二10:44:22 UTC,强烈的Mw = 7.8地震不仅震撼了伊朗,而且震撼了亚洲的西南城市和南部的波斯湾国家。该事件发生在一个人口稀少的山区和山脉地区,靠近一个名为戈斯特的小镇(位于伊朗),但在巴基斯坦马什凯尔市周围造成了破坏和因果关系。随后在2013年4月17日发生了Mw = 5.7的中型余震,没有任何破坏或因果关系的报道。区域构造受波斯湾板块,印度板块和欧亚板块多重收敛的影响。我们应用偏斜反演来搜索最适合的矩张量和位错网格搜索,以通过双偶断裂面参数的网格搜索来说明最佳震源机制。偏向反演发现主震的CLVD为39%,随后的余震为5%。该CLVD分量可能与俯冲板片在其密度下下降并导致正常机制的俯冲带有关。位错网格搜索后最合适的双偶估计值:主震波幅75,倾角35,斜度-75(全度),Mw = 7.66,主震波幅Mw = 7.66,倾角40,倾角-90(全度),余震的Mw = 5.53。根据地震活动度分布,存在两种地震活动度:(1)Makran海岸附近的地壳地震活动带(深度大于50 km)和(2)地壳带以下的地震活动带(介于50 km和150 km之间)加上Makran和波斯高原的其余部分。

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