Alrubaidi Mohammed, Alhaddad Mohammed S, Al-Safi Sulaiman I H, Alhammadi S A, Yahya Abobaker S, Abadel Aref A
Department of Civil Engineering, Emirates International University, Sana'a, Yemen.
Department of Civil Engineering, King Saud University, Riyadh, Saudi Arabia.
Heliyon. 2021 Dec 2;7(12):e08520. doi: 10.1016/j.heliyon.2021.e08520. eCollection 2021 Dec.
The seismic hazard analyses for Yemen have attracted the attention of researchers during the last two decades. However, the studies are limited and mainly use deterministic or approximate conventional probabilistic approaches. The conclusions drawn from these studies do not fit with current seismic design codes (International Building Code). This article presented the method and findings of a probabilistic seismic hazard assessment for Yemen in accordance with current seismic design building regulations. All the data sources, available nationally and internationally, were utilized in compiling earthquake database by covering the recent records and the seismic activity maps of the study region. The study area was regionalized to 11 seismotectonic area sources on the basis of the seismicity maps and available tectonic maps. On the analytical side, the earthquake recurrence analysis was evaluated for each source, and logic tree concept was used to model the seismic sources that may have significant effect on seismic hazard evaluation of Yemen as a combination of area and line sources. A probabilistic forecasting model was formulated, appropriate ground motion attenuation relationships were used, and seismic hazard contour maps were developed for the entire Yemen area. The maps present dense contours of peak ground accelerations and short and long period spectral accelerations for different return periods. The highest predicted seismic hazard is found in Dhamar City. This study provides basic and essential requirements that will be valuable in developing advanced seismic design criteria for Yemen.
在过去二十年里，也门的地震危险性分析引起了研究人员的关注。然而，相关研究有限，主要采用确定性或近似传统概率方法。这些研究得出的结论与现行抗震设计规范（《国际建筑规范》）不符。本文介绍了根据现行抗震设计建筑法规对也门进行概率地震危险性评估的方法和结果。通过涵盖研究区域的近期记录和地震活动图，利用了国内和国际上所有可用的数据源来编制地震数据库。基于地震活动图和现有构造图，研究区域被划分为11个地震构造区域源。在分析方面，对每个源进行了地震复发分析，并使用逻辑树概念对可能对也门地震危险性评估有重大影响的地震源进行建模，将其作为面积源和线源的组合。制定了概率预测模型，使用了合适的地面运动衰减关系，并为整个也门地区绘制了地震危险性等值线图。这些地图展示了不同重现期的峰值地面加速度以及短周期和长周期谱加速度的密集等值线。预测地震危险性最高的地区是扎马尔市。这项研究提供了基本且必要的要求，这对于为也门制定先进的抗震设计标准将具有重要价值。
