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Fault orientations in the upper crust beneath an intraplate active zone in northern Egypt

机译：埃及北部板内活动带下方上地壳的断裂方向

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The present study aims to demarcate the active fault orientation in the upper crust of Dahshour Seismic Zone (DSZ) in Northern Egypt, and its relation to the regional tectonics. High-resolution earthquake relocations and focal mechanism solutions were determined using the double-difference location method and the forward modelling of the amplitude spectrum constrained with P-wave polarities, respectively. Up to 244 earthquakes were relocated by measuring differential travel times between events, as obtained from cross-correlation waveform analysis. The relocated hypocenters exhibited a seismogenic crust of 6-km thickness (most hypocenters have a focal depth of 18 to 24 km). Incorporation of hypocentral distributions and focal mechanisms depicts distinct fault planes trending to the NW and ENE to EW, randomly distributed in the whole dislocation zone. The reactivation of these pre-existing faults is attributed to the northern Red Sea-Gulf of Suez rifts and the closure of the Neotethys, respectively; implying a potential impact of the regional tectonic process on the deformation acting in the upper crust of the local seismogenic zones of northern Egypt.
机译：本研究旨在划定埃及北部达斯豪斯地震带（DSZ）上地壳的活动断层取向及其与区域构造的关系。分别使用双差定位法和受P波极性约束的振幅谱的正演模型确定了高分辨率地震震源和震源机制解。通过测量事件之间的差异传播时间，可以重新定位多达244个地震，这是通过互相关波形分析获得的。搬迁后的震源地壳厚度为6公里（大多数震源的震源深度为18至24公里）。次中心分布和震源机制的结合描绘了不同的断层平面，向北向，从北向北向北向北向北延伸，并随机分布在整个位错区。这些先前存在的断层的重新活化分别归因于北部的苏伊士裂谷红海湾和新特提斯的关闭。这暗示了区域构造过程可能对作用于埃及北部局部地震发生带上地壳的形变产生潜在影响。

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