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Authors: Castelli, V. 
Title: Hidden behind the Ranges: How the 13 April 1558 “Sienese” Earthquake Was Put in Its Place
Issue Date: Jun-2004
Series/Report no.: 3/75 (2004)
DOI: 10.1785/ gssrl.75.3.342
Keywords: Central Tuscany, Relocation of misplaced earthquake
Archive research, Macroseismic intensity map
Subject Classification04. Solid Earth::04.06. Seismology::04.06.05. Historical seismology 
Abstract: The 13 april 1558 earthquake was located midway between Siena and Florence (Tuscany) with epicentral intensity VI-VII MCS and magnitude 4.6 by the CPTI Working Group (1999) catalog. The historical data set from which these epicentral parameters were derived is extremely scanty: two low macroseismic intensity data points (Florence and Siena) and vague mentions of "more damage" in the intermediate area. By mean of a targeted archive research, the data set has been very much improved (from 2 to 21 macroseismic intensity data points) and a new set of epicentral parameters has been assessed, turning a comparatively minor damaging event into one with epicentral intensity IX MCS and magnitude 5.8, located in Valdambra, an area with no extant record of seismic activity before this study.
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