الفهرس | Only 14 pages are availabe for public view |
Abstract This study is focused on the activity of neotectonics in the gulf of Aqaba, which helps in the understanding of their fundamental origins and explains the concepts of tectonic hazards. Bathymetric data from R/V Meteor and seismicity data from a network of (20 ) temporary and permanent stations deployed for 12 months were combined with existing magnetic and gravity data to examine the neotectonics of the Gulf of Aqaba. A little understood region which links •the Red Sea a new ocean with Dead Sea transform. The bathymetric map showed 3 en echelon elongated basins. In the north is the Elat deep (50 km by 3-8 km and depth up to 900 m); the central region includes the Aragonese (6-8 km by 1800 m) and Amona (4-5 km by 1 km by 1550m) deeps; and the southern basin (4.5 km by 1 km) includes the Dakar and Tiran deeps at depths of 1400 m and l300 m. The polynomial fitting teclmique is used to separate the regional and residual components. Two dimensional modeling is used to estimate the crustal thickness. The earthquake energy accumulation and stress DROP analysis is used to understand the rupture mechanism. Accordingly, different structural maps, structural models and seismic activity maps have been constructed by the writer. The results are: (a). The asymmetry of the crustal thickness between eastern and western borders of the Gulf of Aqaba could be attributed to a simultaneous strike slip motion. The observed displacement along the Moho discontinuity between the two borders may be about 20.4 km. Accordingly, the transform fault displacement in the gulf could be achieved in about 3.8 to 4.08 (million year) M.y, where the rates of the transform motion is about 0.5 to 0.6 cm/y. This displacement may be related. |