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• W72649836 abstract "The area investigated, the Sansepolcro basin, is characterized by the presence of important earthquakes in the past with estimated intensity even larger than IX MCS (the 1352 Monterchi earthquake, the 1389 Boccaserriola, the 1458 Citta’ di Castello, the 1781 Cagliese and the 1917 Monterchi-Citerna earthquakes, CPTI Working Group, 2004) and by a surprisingly scarce instrumental seismicity compared to the adjacent areas struck by high seismicity (Castello et al., 2005; Ciaccio et al., 2006). The area north of Sansepolcro has been struck in recent years by four minor sequences, occurred between 1987 and 2001 with magnitude ranging from Ml3.0 to Mw4.7. In this work we analyse the most important earthquakes of the 20th century occurred in the Altotiberina Valley in 1917, 1918, 1919 and 1948; in particular instrumental relocation, focal mechanisms and Ms and Mw magnitude estimation are re-evaluated. The relocation of these earthquakes is particularly critical and is an important issue. An instrumental and precise location is critical for the complexity of the problems associated with the study of seismograms prior to the first half of the twentieth century and is relevant because in the surrounding regions higher seismicity is observed. Regarding this peculiarity of the area, it’s very important to detect the location of the historical earthquakes: in particular, the 1917 event is often associated to the possibility that the regional low angle Altotiberina Fault (Barchi et al., 1998) is able or not to nucleate largeor moderate-magnitude events, being historically located close to its surface (Boncio and Lavecchia, 2000). References Barchi, M.R., A. De Feyter, M.B. Magnani, G. Minelli, G. Pialli and B.M. Sotera (1998) Extensional tectonics in the Northern Apennines (Italy): Evidence from the CROP03 deep seismic reflection line, Mem. Soc. Geol. It., 52, 527-538. Boncio, P. and G. Lavecchia (2000) A structurl model for active extension in Central Italy, J. of Geodynamics, 29, 233-244. Castello, B., G., Selvaggi, C., Chiarabba, and A., Amato (2005) CSI Catalogo della sismicita italiana 1981-2002, versione 1.0. INGV-CNT, Roma http://www.ingv.it/CSI Ciaccio M.G., Pondrelli S., Frepoli A. (2006) Earthquake fault-plane solutions and patterns of seismicity within the Umbria Region, Italy ANNALS OF GEOPHYSICS, VOL. 49, N. 4/5, August/October 2006. CPTI Working Group (2004) Catalogo Parametrico dei Terremoti Italiani versione 2004 (CPTI04). INGV, Bologna. http://emidius.mi.ingv.it/CPTI Tectonic setting and Instrumental Seismicity The Sansepolcro basin (Figure 1) is a NW-SE elongated basin, about 10 km long and 6 km wide, presently occupied by the northernmost part of the High Tiber Valley. The Sansepolcro basin represents the northernmost basin, located north of the Citta di Castello town. It is infilled by Quaternary continental, fluvial and lacustrine sediments. Most Authors recognised that the onset and evolution of the Tiber basin was driven by a complex system of NNW-SSE striking normal faults. The Sansepolcro basin is a region characterized by the absence of instrumental seismicity (M > 2.5) even if several historical events are recorded. On the contrary, the zone north of Sansepolcro has been site in the last years of diffuse moderate seismicity testified by four sequences from 1987 to 2001. The strongest mainshock (Md=4.3; Ml=4.4) occurred on November 26, 2001 (Figure 2), the other sequences presented mainshock of of Md=4.1, in October 1997, Md=3.7 in May 1990 and Md=3.8 in July 1987. The depth of the 2001 mainshock is localized at 8 km. The mainshock displays a normal fault mechanism with NW-SE strike, low-angle rupture plane dipping toward NE, similar to the focal mechanism of the 1997 sequence. The epicenter distribution of the 2001 sequence is very well constrained compared to the previous ones because of the larger number of station recordings available. Allthough the smaller number of stations, a SW-dipping alignment is observed for the 1997 sequence. The focal sphere of the 1987 mainshock shows a normal mechanism with an EW-strike (Ciaccio et al, 2006 and ref. therein). These previous results will be improved with the further analysis of the 22 March 1918 and 25 October 1919 and 13 June 1948 earquakes, where only a macroseismic location and magnitude estimation are available. Gubbio Citta di Castello Sansepolcro B Tiber asin 12 12.2 12.4 12.6 12.8" @default.
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• W72649836 date "2009-04-19" @default.
• W72649836 modified "2023-10-03" @default.
• W72649836 title "The Correlation Between Historical and Instrumental Seismicity in the Sansepolcro Basin, Northern Apennines, Italy" @default.
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