Investigation of the Effects of Earthquake Swarms in the Seismic Hazard in the Gulf of Aqaba, Northern Red Sea

Eid A. Al-Tarazi

Abstract


The seismic hazard potential in the Gulf of Aqaba has been assessed in this study. The probabilistic approach has been utilized to produce a seismic hazard map in the mean of maximum peak ground acceleration, in cm/sec2, with 90% probabilities of not being exceeded in 50 years. The seismicity of the Gulf of Aqaba is characterized by seismic swarm’s activity. To determine the sensitivity of the calculated hazard map to the seismic swarm’s data that occurred in the 1983, 1990, 1993, and 1995, another hazard map is performed and presented in this study. The first group of data has indicated that the maximum hazard values occur in the central part of the Gulf, whereas the values decrease north- and southwards. The maximum peak ground accelerations, with 90% probabilities that will not be exceeded in 50 years, for the first group in Aqaba, Hagel, Nuweiba, Dahab, Magna, and Nebek cities are 260, 300, 270, 275, 275, and 260 cm/sec2, respectively, while for the second group are 210, 205, 175, 175, 175, and 180 cm/sec2, respectively for the same cities mentioned above. The seismic hazard coming from the swarms represent 24% of the total for Aqaba city. For the other cities, it ranges among 45% to 57% such as for Nuweiba in Egypt and for Hagel in Saudi Arabia.

Keywords


seismicity of Jordan, seismic hazard, seismotectonic, Gulf of Aqaba

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