GTOPO30 : A digital elevation model with a geometrical ground resolution of 30 arc seconds (ca. 1 km point distance), distributed by the USGS (U. S. Geological Survey)
CEDIM - Center for Disaster Management and Risk Reduction Technology, GFZ German Research Centre for Geosciences (Section 2.1 Earthquake Risk and Early Warning), CEDIM-Glossary (Terms and Definitions of Risk Sciences), Karlsruhe Institute of Technology (KIT), D-76128 Karlsruhe, Germany 2005. http: //www.cedim.de/download/glossar-gesamt-20050624.pd f, (Rsk Sci - Brit) {792}