Geo-Modelling and Geo-Informatics

   doi:10.3850/978-981-07-0188-8_P080

ABSTRACT

In order to assess the seismic risk for architectural heritages reliably, it is crucial to evaluate the earthquake ground motion of a historical site using the site-specific response analysis. Because most of the historical events were not experienced at the rock-outcrop but at the ground surface of the soil sites and the effects of site amplification were already included in the historical earthquake intensities, the rock-outcrop motion in the hazard map is potentially overestimated. In order to assess the extent of potential overestimation in the hazard map, it is essential to evaluate the range of site amplification at the various historical sites of architectural heritages using site-specific ground response analysis and interpret the spatial geotechnical information using GIS tool. In this study, for the seismic risk assessment of architectural heritages in representative historic cities, Gyeongju and Buyeo, the site-specific ground response analyses were performed at each historical site. Using GIS based microzonation methodology, the seismic information such as bedrock depth, site period, peak ground acceleration, and site coefficients were spatially interpreted for the scenario earthquakes and the potential overestimation of rock outcrop motion in the hazard map based on historical records was assessed. The developed site-specific seismic responses of the cultural heritage sites and the GIS based seismic zonation will be utilized for the seismic risk assessment of cultural heritages in historic areas.

© 2012 by Geotechnical Society of Singapore (GeoSS)