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Document Type |
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Thesis |
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Document Title |
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SEISMIC HAZARD ASSESSMENT IN HARRAT LUNAYYIR, WESTERN SAUDI ARABIA تقييم الخطر الزلزالي في حرة ليونير. غرب السعودية |
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Subject |
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Faculty of Earth Sciences |
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Document Language |
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Arabic |
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Abstract |
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On October 11, 2007, a swarm of earthquakes occurred on the eastern side of the lava fields of Harrat Lunayyir – the relatively young Cenozoic lava field in western Saudi Arabia. The earthquake sequence included a MW 5.7 event that happened 19 May 2009 and caused minor damage to structures in the town of Al-Ays located about 40 km southeast of the epicenter.
The Harrat Lunayyir area was not considered as a seismic source zone when constructing seismic hazard maps used in the current issue of Saudi Building Code (SBC-301-2007). In this study the characteristics of seismic hazard were estimated for the Harrat Lunayyir area and particularly for the town of Al-Ays. The up-to-date geophysical, geological and seismological databases, as well as results of new geophysical and seismological studies, were used for construction of necessary input models for seismic hazard assessment. The assessments were performed using traditional Cornell-McGuire probabilistic seismic hazard assessment and scenario-based assessment using Monte Carlo generation of possible earthquake swarms.
The results of probabilistic estimations of seismic hazard show that the town of Al-Ays is characterized by significant level of hazard. For return period 2475 years peak ground accelerations in the town of Al-Ays are expected to be larger than 150 cm/s2, 170 cm/s2, and 200 cm/s2, for site class B ; class C , and class D , respectively. In the central part of the Harrat Lunayyir area, the expected PGA values at soft rock (class B) sites for return period 2475 years are larger than 200 cm/s2 . The high level of seismic hazard is also confirmed by scenario-based calculations, which consist in estimation of the characteristics of ground motion in particular location during hypothetical earthquakes swarms.
The site-dependent design response spectra were constructed with Saudi Building code (SBC-301-2007)The design spectra obtained in this study reveal sufficiently higher amplitudes in short-period range. |
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Supervisor |
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Prof. Sherif Mohamed Elnashar |
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Thesis Type |
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Doctorate Thesis |
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Publishing Year |
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1439 AH
2018 AD |
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Added Date |
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Monday, January 15, 2018 |
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Researchers
| هاني محمود زهران | Zahra, Hani Mahmoud | Researcher | Doctorate | |
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