A distribution-free analysis of magnitude-intensity relationships: an application to the Mediterranean region |
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| Institution: | 1. Royal Observatory of Belgium, Seismology and Gravimetry Department, Avenue Circulaire 3, B-1180 Brussels, Belgium;2. Belgian National Agency for Radioactive Waste and Enriched Fissile Material (ONDRAF/NIRAS), Long-term Research, Design & Development Department, Avenue des Arts 14, B-1210 Brussels, Belgium;3. Ghent University, Faculty of Sciences, Department of Geology, Laboratory of Mineralogy and Petrology, Krijgslaan 281 (S8), B-9000 Ghent, Belgium;4. Belgian Nuclear Research Centre (SCK?CEN), Institute for Environment, Health and Safety, Boeretang 200, B-2400 Mol, Belgium;5. Samsuffit-Geoservices BVBA, Eggelstraat 8, B-2530 Boechout, Belgium;6. University of Cologne, Institute of Geography, Albertus-Magnus-Platz, 50923 Cologne, Germany;7. Royal Museum for Central Africa, Earth Sciences, Surface Environments and Collection Management, Leuvensesteenweg 13, B-3080 Tervuren, Belgium;8. KULeuven, Department of Earth and Environmental Sciences, Division of Geology, Celestijnenlaan 200 E, B-3001 Heverlee, Belgium;1. Senckenberg Museum für Naturkunde Görlitz, Am Museum 1, PF 300154, 02826 Görlitz, Saxony, Germany;2. Institute of Geophysics, Academy of Sciences of the Czech Republic, Bo?ní II/1401, 141 31 Praha 4, Czech Republic |
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| Abstract: | A statistical analysis of the relations between macroseismic intensity and magnitude is presented. The examined data set contains earthquakes characterized by epicentral or maximum intensity ≥ VI which occurred in the Mediterranean region. As a first step, an empirical magnitude-intensity relationship has been determined by using the whole data set. Then, differences between experimental magnitude values and the ones expected on the basis of the empirical relationship have been correlated with some features related both to physical and data sources characteristics. On this basis, a distribution-free statistical approach has been developed to attempt a regionalization of the examined area, able to locally optimize the performances of magnitude-intensity relations. However, the results showed that data relative to larger events (intensity ≥ VII) are not sufficient to perform any reliable zonation of the area. Thus, well-constrained relationships determined for the whole Mediterranean region should be preferred to ill-defined local ones. Concerning smaller earthquakes (intensity VI), the analysis suggests that an efficient zonation could only be obtained if medium-scale variations (lower than 200 Km) are taken into account. |
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