This paper presents a seismic hazard map for the southern part of Ghana prepared using the probabilistic approach, and seismic hazard assessment results for six cities. The seismic hazard map was prepared for 10% probability of exceedance for peak ground acceleration in 50 years. The input parameters used for the computations of hazard were obtained using data from a catalogue that was compiled and homogenised to moment magnitude (Mw). The catalogue covered a period of over a century (1615–2009). The hazard assessment is based on the Poisson model for earthquake occurrence, and hence, dependent events were identified and removed from the catalogue. The following attenuation relations were adopted and used in this study—Allen (for south and eastern Australia), Silva et al. (for Central and eastern North America), Campbell and Bozorgnia (for worldwide active-shallow-crust regions) and Chiou and Youngs (for worldwide active-shallow-crust regions). Logic-tree formalism was used to account for possible uncertainties associated with the attenuation relationships. OpenQuake software package was used for the hazard calculation. The highest level of seismic hazard is found in the Accra and Tema seismic zones, with estimated peak ground acceleration close to 0.2 g. The level of the seismic hazard in the southern part of Ghana diminishes with distance away from the Accra/Tema region to a value of 0.05 g at a distance of about 140 km.

中文翻译：

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加纳南部地区的概率地震灾害评估。

本文介绍了使用概率方法绘制的加纳南部地震灾害图，以及六个城市的地震灾害评估结果。地震危险图针对50年内地面峰值加速度的超出概率为10％进行了准备。使用来自目录的数据获得用于计算危险的输入参数，该目录已编译并均一化为矩量（Mw）。该目录涵盖了一个多世纪的时间（1615–2009）。危害评估基于地震发生的泊松模型，因此，识别了相关事件并将其从目录中删除。在这项研究中采用并使用了以下衰减关系-艾伦（澳大利亚南部和东部），席尔瓦等。（适用于北美中部和东部），Campbell和Bozorgnia（适用于全球活动浅表壳地区）和Chiou and Youngs（适用于全球活动浅表壳地区）。逻辑树形式主义被用来解释与衰减关系相关的可能不确定性。OpenQuake软件包用于危害计算。在阿克拉和特马地震带发现了最高的地震危险等级，估计的峰值地面加速度接近0.2 g。加纳南部的地震危险程度随着距阿克拉/特马地区的距离在约140 km处减小至0.05 g。OpenQuake软件包用于危害计算。在阿克拉和特马地震带发现了最高的地震危险等级，估计的峰值地面加速度接近0.2 g。加纳南部的地震危险程度随着距阿克拉/特马地区的距离在约140 km处减小至0.05 g。OpenQuake软件包用于危害计算。在阿克拉和特马地震带发现了最高的地震危险等级，估计的峰值地面加速度接近0.2 g。加纳南部的地震危险程度随着距阿克拉/特马地区的距离在约140 km处减小至0.05 g。