Resumo

KHALIL, Ahmed; TONI, Mostafa; HASSOUP, Awad  e  MANSOUR, Khamis. Analysis of aeromagnetic data for interpretation of seismicity at Fayoum-Cairo area, Egypt. Earth Sci. Res. J. [online]. 2014, vol.18, n.1, pp.7-13. ISSN 1794-6190.  https://doi.org/10.15446/esrj.v18n1.36938.

An aeromagnetic reconnaissance study is presented to delineate the subsurface structure and tectonic setting at the Fayoum-Cairo district, which experienced a damaging earthquake on October 12, 1992 of magnitude (M = 5.7). Analysis of aeromagnetic and seismicity data demonstrate three significant tectonic faults with trending to the NE-SW, NW-SE and E-W. The basement is uplifted in the northern and central parts with a depth of 1.3 km, and deepening in the southern part with a depth of 2.5 km. This is a seismically active zone and historically has experienced damaging earthquakes. In 1847, a damaging earthquake with maximum epicentral intensity (Modified Mercalli Intensity (MMI) = VII) was located there. On the eastern side, earthquake sources are well recognized at different locations. These sources created events of moderate size magnitude M < 5. The focal mechanisms of the major events from these sources are generally strike-slip with normal component. The focal mechanism of the earthquake on October 12, 1992 is normal fault type with strike trends in the NW-SE direction. These fault plane solutions are consistent with the tectonic trends derived from the aeromagnetic data mentioned above and suggest that the new tectonics of northeast Africa is predominant.

Palavras-chave : Seismicity; aeromagnetic data; structural trends; Fayoum-Cairo; Egypt.

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