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Journal of African earth sciences v.139, 2018년, pp.275 - 282   SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

A recent Mw 4.3 earthquake proving activity of a shallow strike-slip fault in the northern part of the Western Desert, Egypt

Ezzelarab, Mohamed (Sultan Qaboos University, Earthquake Monitoring Center, 50 Alkouhd, 123, Muscat, Oman ) ; Ebraheem, Mohamed O. (Assiut University, New Valley Branch, Faculty of Science, Geology Department, Assiut, Egypt ) ; Zahradník, Jiří (Charles University, Faculty of Mathematics and Physics, Prague, Czech Republic ) ;
  • 초록  

    Abstract The Mw 4.3 earthquake of September 2015 is the first felt earthquake since 1900 A.D in the northern part of the Western Desert, Egypt, south of the El-Alamein City. The available waveform data observed at epicentral distances 52–391 km was collected and carefully evaluated. Nine broad-band stations were selected to invert full waveforms for the centroid position (horizontal and vertical) and for the focal mechanism solution. The first-arrival travel times, polarities and low-frequency full waveforms (0.03–0.08 Hz) are consistently explained in this paper as caused by a shallow source of the strike-slip mechanism. This finding indicates causal relation of this earthquake to the W-E trending South El-Alamein fault, which developed in Late Cretaceous as dextral strike slip fault. Recent activity of this fault, proven by the studied rare earthquake, is of fundamental importance for future seismic hazard evaluations, underlined by proximity (∼65 km) of the source zone to the first nuclear power plant planned site in Egypt. Safe exploration and possible future exploitation of hydrocarbon reserves, reported around El-Alamein fault in the last decade, cannot be made without considering the seismic potential of this fault. Highlights The first felt earthquake at South El-Alamein City is discussed. Accurate analysis for the source position and focal mechanism is carried out. The event is located close to the previously known South El-Alamein fault. The inverted focal mechanism is a strike-slip with minor reverse component. The studied event is important for the ongoing earthquake hazard analyses in Egypt.


  • 주제어

    South El-Alamein fault .   Waveform inversion .   Source mechanism-position and time grid search .   Jackknife test.  

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