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  • Articles  (3)
  • Egypt  (3)
  • 2020-2024
  • 1990-1994  (3)
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  • 1994  (3)
  • 1993
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Natural hazards 9 (1994), S. 235-245 
    ISSN: 1573-0840
    Keywords: Egypt ; earthquakes ; fracture density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Egypt had been subjected to earthquakes of various degrees but earthquake observation in this country started only in 1899. Earthquakes were found in the locations where fractures have relatives high densities. The Fracture pattern of Egypt south Latitude at 29° N was studied regionally based on Landsat images and aerial photomosaics. Fractures in the Eastern Desert have the prominent trends, NW, EW, NNW and ENE, showing high density in the northern and southern parts. These fractures control the distribution of mineral deposits and radioactivity in the basement rocks. Fractures in Western Desert are less remarkable with the main trend NNW, E-W, N-S and NW, showing high density in the central part. The NNW trending fractures have the same direction of sand dunes which cover larger areas in the northwestern part of Western Desert. Based on the geographical distribution of earthquakes in the seismic maps and centers of high fractures density on the structural contour maps, the area south of latitude 29° N of Egypt was divided into three regions: The Red Sea, Western Desert and Aswan Environs. This correlation led to the conclusion that the fractures have an effect on earthquake activity, are trending ENE and WNW in the Red Sea, NW and N-S in the Western Desert and E-W and NNW in Aswan Environs. It should be emphasized that fractures with higher density are more susceptible to earthquakes in the locations characterized by two dominant sets of fractures especially at their intersections.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Natural hazards 10 (1994), S. 247-259 
    ISSN: 1573-0840
    Keywords: Egypt ; seismic hazard ; maximum expected magnitude ; annual activity ; b-value
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Earthquake hazard parameters such as maximum expected magnitude,M max, annual activity rate,λ, andb value of the Gutenberg-Richter relation have been evaluated for two regions of Egypt. The applied maximum likelihood method permits the combination of both historical and instrumental data. The catalogue used covers earthquakes with magnitude ≥3 from the time interval 320–1987. The uncertainties in magnitude estimates and threshold of completeness were taken into account. The hazard parameter determination is performed for two study areas. The first area, Gulf of Suez, has higher seismicity level than the second, all other active zones in Egypt.b-values of 1.2 ± 0.1 and 1.0 ± 0.1 are obtained for the two areas, respectively. The number of annually expected earthquakes with magnitude ≥3 is much larger in the Gulf of Suez, 39 ± 2 than in the other areas, 6.1 ± 0.5. The maximum expected magnitude is calculated to be 6.5 ± 0.4 for a time span of 209 years for the Gulf of Suez and 6.1 ± 0.3 for a time span of 1667 years for the remaining active areas in Egypt. Respective periods of 10 and 20 years were reported for earthquakes of magnitude 5.0 for the two subareas.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Natural hazards 10 (1994), S. 261-274 
    ISSN: 1573-0840
    Keywords: Seismic risk ; Dahshour earthquake ; Egypt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract An earthquake of local magnitude 5.3 (duration magnitudeM d ) on the Richter Scale occurred at Dahshour, 18 km south of Cairo, Egypt, on Monday, 12 October 1992 at 3:09 pm (local time). Numerous aftershocks followed the main event during the following weeks with magnitude up to 4.3. The earthquake occurred in an area that has had no recent seismic activity, and affected many cities in Egypt. Many buildings and monuments were severely damaged or collapsed. Modern concrete skeletal structures suffered minor nonstructural damage. Earthquake physical damage was estimated at about one billion U.S. Dollars. The severity of the damage was mainly due to poor construction materials and detailing, aging, inferior workmanship, and inadequate maintenance. Egypt was generally considered to be an area of moderate seismic activity. In 1989, earthquake provisions were first introduced in the Egyptian Code of Practice for Reinforced Concrete Structures only. The earthquake clearly showed the urgent need for an assessment and rehabilitation program to mitigate seismic risk hazard in existing structures. In addition, future development planning, and earthquake preparedness strategies should implement lessons learned from the event. In this paper, an overview discussion about the observations from the 12 October earthquake is presented.
    Type of Medium: Electronic Resource
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