Intensity field of the 19 June 1975 Gargano (Southern Italy) earthquake |
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| Institution: | 1. Department of Geoinformatics - Z_GIS, University of Salzburg, 5020 Salzburg, Austria;2. Manaaki Whenua - Landcare Research, Palmerston North 4442, New Zealand;3. Department of Geography and Geology, University of Salzburg, 5020 Salzburg, Austria;1. Instituto Andaluz de Geofísica, Campus Universitario de Cartuja, Universidad de Granada, 18071 Granada, Spain;2. Departamento de Química y Física, Universidad de Almeria, 04120 Almeria, Spain;3. Departamento de Física Teórica y del Cosmos, Universidad de Granada, 18071 Granada, Spain;4. Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain |
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| Abstract: | Many moderate events reported by Italian earthquake catalogues (either historical or recent) are listed with an epicentral intensity derived from intensitymagnitude relationships or evaluated based on preliminary sources. Contradictions may arise among different catalogues when the effects of a given earthquake are not assessed through a specific macroseismic study as each catalogue generally uses its own criteria for evaluating the intensity. In this paper we present the case of the June 19 1975 earthquake, a ML = 5.1 (ING seismological bulletin) event that occurred in the Gargano area (southern Italy). The intensity reported by the ING catalogue is VIII MCS (estimated from magnitude), that reported by the NT4.1 catalogue is VI MCS, while the PFG catalogue does not report an intensity. The case of this event is well representative of a period during which macroseismic studies were not undertaken systematically in Italy. In this paper we reassess the macroseismic intensity of this event using procedures implemented and routinely used at ING. |
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