DE-AGGREGATION OF PROBABILISTIC SEISMIC HAZARD ASSESSMENT FOR BULGARIA

作者：Solakov Dimcho^*; Simeonova Stela; Trifonova Petya

来源：Comptes Rendus de l Academie Bulgare des Sciences, 2012, 65(4): 499-U101.

• probablistic seismic hazard assessment
• PSHA de-aggregation
• design earthquake
• administrative centres in Bulgaria

Probabilistic seismic hazard analysis (PSHA) considers a multitude of earthquake occurrences and ground motions, and produces an integrated description of seismic hazard, representing all events. The PSHA is able to quantify and account for the random uncertainties associated with estimation of the seismicity and the attenuation characteristics of the region. For physical interpretation of the results from PSHA and for taking certain engineering decisions, it is desirable to have a representative earthquake which is compatible with the results of the PSHA method. This could be achieved through de-aggregation of the probabilistic seismic hazard. A procedure called de-aggregation was applied to examine the spatial and magnitude dependence of PSHA results. It was aimed at determining the magnitudes and distances that contribute to the calculated peak ground acceleration (PGA) exceedance frequencies at a 475-years-return period for 27 Bulgarian cities.

• 出版日期2012