Building a Ground-Motion Logic Tree for South America Within the Gem-Sara Project Framework

Abstract eng:
Within the framework of the GEM-SARA project (http://www.globalquakemodel.org/what/regions/south-america/) aimed at estimating hazard and risk for South America, a working group on strong ground motion data and selection of GroundMotion Prediction Equations (GMPEs) was created. The team includes researchers from South America (Bolivia, Brazil, Colombia, Chile, Ecuador, and Venezuela). In a first step, strong ground motion data was collected in each country. The same record processing and metadata collection schemes are used for the entire dataset in order to build a homogenized database. In a second step, tools were developed in order to benefit from the OpenQuake-engine and associated toolkits libraries to perform GMPEs comparisons. Based on expert judgment, the fit to the South American dataset, and the results of the comparisons, the group proposes a set of GMPEs to populate the Ground-Motion logic-tree for conducting PSHA analyses in South America.

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