Abstract
Paleo and recent earthquakes have been recorded in Wadi Hagul area and its environs, which have left behind geologic structures of deformation preserved in exposed sedimentary rocks. To evaluate such deformation and surface break, different techniques and data types are used compromising image processing techniques, Geographic Information Systems (GIS), seismicity data, as well as, field investigation. The field investigation clarified that the study area is enriched with soft-sediment deformation structures encompassing two types of geologic structures; brittle and viscoplastic structures. The analysis of the various types of data elucidate that, the earthquakes of Wadi Hagul are frequently distributed at an average depth ranging from (1 to 35 km) within the top of the Earth’s crust which are mainly controlled by existing Hagul fault zone. The study gives new insight for a better understanding of the seismic activity in the study area which helps in the seismic hazard assessment
Highlights
Paleo and recent earthquakes have been recorded in Wadi Hagul area and its environs, which have left behind geologic structures of deformation preserved in exposed sedimentary rocks
For lithologic discrimination, Enhanced Thematic Mapper (ETM) image of spatial resolution of 30 m*30 m was used and enhanced by principal component analysis (PCA) technique to delineate the major tributaries including the main track of Wadi Hagul and to separate the different exposed rock units
The ENE-WSW Hagul Fault there are many trends of faulting dissecting as well as along Wadi Hagul, the description of faulting will be mainly assigned to Hagul fault. This name was suggested by the present study to describe the fracture zone causing seismic activity in Wadi Hagul
Summary
The most important national project is the development of the northern part of the Gulf of Suez encompassing the supplement of the gas pipe lines through the main track of study area and its surroundings. Wadi Hagul area is considered a morphotectonic depression falling between the southern scarps of Gebel Ataqa in the north and the northern scarp of El-Galala El-Bahariya Plateau in the south. According to 2,3 the study area and its environs include six major geomorphic units namely, Gulf of Suez coastal plain, Wadi Ghoweiba structural plain, El-Galala ElBahariya, Akheider, Gebel Ataqa and Kehaliya-Um Zeita structural plateaus, Wadi Hagul area belongs to Ke-haliyaUm Zeita morpho-structural province (Figure 1)
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