Probabilistic seismic hazard assessment for the United Arab Emirates using integrated seismic source model

• Published in: Journal of Asian Earth Sciences: X Vol. 11; p. 100173
• Main Authors: Barakat, Samer A., Arab, Mohamed G., Awad, Raghad A., Husein Malkawi, Dima A., Metawa, Abdulrahman, Omar, Maher
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2024; Elsevier
• Subjects: GMPE; Integrated Seismic Source Model; Peak Ground Acceleration; Probabilistic; Seismic Hazard Assessment; United Arab Emirates; Seismic Hazard Assessment; GMPE; United Arab Emirates; Peak Ground Acceleration; Probabilistic; Integrated Seismic Source Model
• ISSN: 2590-0560; 2590-0560
• DOI: 10.1016/j.jaesx.2024.100173

[Display omitted] •PSHA incorporating line fault sources reveals higher seismic risks near faults.•The effect of line fault sources is clearer for estimated seismic hazards with longer return periods.•Our line fault-based PSHA method is adaptable in other geographic areas.•The developed hazard maps and curves are a vital tool for seismic design guidelines. This study emphasizes the role of active faults as seismogenic sources in probabilistic seismic hazard assessments (PSHA) in the United Arab Emirates (UAE). An extensive PSHA analysis has been carried out in this study, which incorporates faults alongside area seismic sources within a logic tree-oriented framework. Seismicity is evaluated in terms of spectral acceleration (SA) and Peak ground acceleration (PGA) for return periods of 2,475, 975, and 475 years at 5 % damping. The results are compared with seismic hazard projections derived from previous PSHA studies that utilized only area sources. A key observation is the pronounced impact of the Dibba and Oman range frontal faults on the UAE's northeastern region due to the proximity of the faults. This contributes to higher seismic hazard in this region, with some return periods showing greater hazard levels than those documented in earlier studies. In order to aid seismic hazard design in the UAE, contour maps depicting the SAs at 0.2 and 1.0 s, along with PGA, are developed. The analysis reveals that the highest seismic hazard is predicted along the northeastern borders of the UAE, particularly the coastal area of Ras-Al Khaimah, with a PGA of 0.22 g for a return period of 2,475 years.