A SSHAC Level 3 Probabilistic Seismic Hazard Analysis for a New-Build Nuclear Site in South Africa

作者：Bommer Julian J^*; Coppersmith Kevin J; Coppersmith Ryan T; Hanson Kathryn L; Mangongolo Azangi; Neveling Johann; Rathje Ellen M; Rodriguez Marek Adrian; Scherbaum Frank; Shelembe Refilwe; Stafford Peter J; Strasser Fleur O

来源：Earthquake Spectra, 2015, 31(2): 661-698.

DOI：10.1193/060913EQS145M

A probabilistic seismic hazard analysis has been conducted for a potential nuclear power plant site on the coast of South Africa, a country of low-to-moderate seismicity. The hazard study was conducted as a SSHAC Level 3 process, the first application of this approach outside North America. Extensive geological investigations identified five fault sources with a non-zero probability of being seismogenic. Five area sources were defined for distributed seismicity, the least active being the host zone for which the low recurrence rates for earthquakes were substantiated through investigations of historical seismicity. Empirical ground-motion prediction equations were adjusted to a horizon within the bedrock at the site using kappa values inferred from weak-motion analyses. These adjusted models were then scaled to create new equations capturing the range of epistemic uncertainty in this region with no strong motion recordings. Surface motions were obtained by convolving the bedrock motions with site amplification functions calculated using measured shear-wave velocity profiles.

• 出版日期2015-5
• 单位Virginia Tech; 美国弗吉尼亚理工大学(Virginia Tech)