A Site Response Map of Europe
Abstract eng: Topographic slope and surface geology are two popular proxies for Vs30, a measure of site response. We use both these proxies to create a NEHRP category site response map of the area covered by the Seismic Hazard Harmonization in Europe (SHARE) project. We use the topographic slope method, based on the correlation between slope and Vs30, in tectonically active southern Europe. The slopes are determined from SRTM digital elevation data at 9 arc second resolution. The SHARE Vs30 data are from sites in Italy, Greece, and Turkey. We develop the correlation by stepping through slope and Vs30 space, calculating standard deviation and bias, and choosing the best-fit slope and Vs30 bins. The final correlation has a slightly lower Vs30 for a given slope than the standard USGS correlation. High quality Vs30 data are sparse in tectonically stable northern Europe, and Pleistocene glaciation has disturbed the sedimentation patterns that justify the slope method. Thus, we use surface geology to define the site response. Detailed digital geology maps and unit descriptions of most northern European countries are available from the OneGeology program (www.onegeology.org). We assign site response units based on the geologic descriptions. The final site response categories do not have discontinuities at country boundaries, showing the consistency of the OneGeology descriptive rubric.
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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Record created 2017-01-18, last modified 2017-01-18
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