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Source Characteristics of the Egyptian Continental Margin Earthquake, 19 October 2012

机译:2012年10月19日埃及大陆边缘地震的震源特征

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摘要

On 19 October 2012, at 03:35:11.2, an earthquake of m_b 5.1 (European Mediterranean Seismological Centre [EMSC]) occurred in the passive continental margin of Egypt within the Nile Cone (Fig. 1a, Table 1). This event is considered the largest offshore earthquake in the last 57 years. Because much highquality data are recorded on modern digital instruments, we can make a more detailed source analysis. Figure 1a shows the locations of the seismograph stations in Egypt and the surrounding countries that recorded the earthquake. The same zone was attacked by a significant earthquake with M_s 6.7 on 12 September 1955. The 1955 event caused notable damage over the Nile Delta and Alexandria. The focal mechanism solution of Costantinescu et al. (1966) for this event (Fig. 1b, Table 2) indicates a strike-slip faulting mechanism with a considerable reverse component along a northeast or eastsoutheast- striking plane. The east-southeast-striking plane yields a right-lateral motion whereas the northeast reflects left-lateral offset.
机译:2012年10月19日,03:35:11.2,在尼罗河锥体内的埃及被动大陆边缘发生了m_b 5.1地震(欧洲地中海地震中心[EMSC])(图1a,表1)。该事件被认为是过去57年中最大的海上地震。由于许多高质量的数据记录在现代数字仪器上,因此我们可以进行更详细的源分析。图1a显示了记录地震的埃及及周边国家的地震仪站的位置。 1955年9月12日,同一区域遭到6.7级M_s地震的袭击。1955年的地震对尼罗河三角洲和亚历山大大区造成了明显破坏。 Costantinescu等人的震源机制解决方案。 (1966)对此事件的研究(图1b,表2)表明了走滑断层机制,沿东北或东南偏东走向平面具有相当大的反向分量。东南偏东的平面产生右旋运动,而东北偏左的偏向运动。

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