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首页> 外文期刊>Acta Geophysica Polonica >TEMPORAL AND THREE DIMENSIONAL SPATIAL ANALYSIS OF SEISMICITY IN THE LAKE ASWAN AREA, EGYPT
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TEMPORAL AND THREE DIMENSIONAL SPATIAL ANALYSIS OF SEISMICITY IN THE LAKE ASWAN AREA, EGYPT

机译：埃及阿斯旺湖地区地震的时空三维空间分析

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摘要

On 28 September 2004 an earthquake swarm with the largest event of magnitude 4.2 occurred in the epicentral area of the 1981 Lake Aswan earthquake (M = 5.7), the latest manifestation of seismicity in the area. The swarm is located in a shallow zone along the Rawraw trend, 8 km north of the Kalabsha fault, the main active fault in the Lake Aswan area. The Kalabsha fault is characterized by the presence of shallow and deep seismic zones. The shallow earthquakes have focal depths smaller than 10 km. The sources of deep earthquakes are located at a depth between 14 and 30 km. Characteristics of seismicity observed from 1982 to 2004 along the Kalabsha and Rawraw faults and the correlation between the temporal variation of seismicity and the water level changes in the Lake Aswan are analysed. The results indicate that the earthquakes in the deep seismic zone along the Kalabsha fault are characterized by a relatively low b-values and show greater degree of clustering than the shallow events. The shallow earthquakes along both the Kalabsha fault and the Rawraw trend are better correlated with the water level changes in the Lake Aswan than the deep events. Thus, the shallow events may be classified as seismicity induced by the water reservoir. Migration of seismic sources along these faults toward the shallow part of the crust is also apparent.
机译：2004年9月28日，在1981年阿斯旺湖地震的震中地区（M = 5.7）发生了震级最大的4.2级地震群，这是该地区地震活动的最新表现。该群位于Rawraw趋势的浅层地区，位于阿斯旺湖地区主要活动断层卡拉布沙断裂以北8公里处。 Kalabsha断层的特征是存在浅，深地震带。浅层地震的震源深度小于10 km。深层地震的震源位于14至30公里之间。分析了1982年至2004年沿Kalabsha和Rawraw断层观测到的地震活动特征，以及地震活动性的时变与阿斯旺湖水位变化之间的相关性。结果表明，沿着Kalabsha断层的深部地震带的地震具有较低的b值特征，并且比浅层地震具有更大的聚类程度。与深部地震相比，沿着卡拉布沙断裂和Rawraw趋势的浅地震与阿斯旺湖水位变化的相关性更好。因此，浅事件可以归类为由水库引起的地震活动。沿这些断层的地震源向地壳浅部的迁移也很明显。

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