GNGTS 2016 - Atti del 35° Convegno Nazionale

162 GNGTS 2016 S essione 1.1 Guerra I., Harabaglia P., Gervasi A., and Rosa A. B.; 2005: The 1998–1999 Pollino (southern Apennines, Italy) Seismic Crisis: Tomography of a Sequence // Ann. Geophys. 48, no. 6, 995-1007. Michetti A.M., Ferreli L., Serva L., and Vittori E.; 1997: Geological evidence for strong historical earthquakes in “aseismic” region: the Pollino case (southern Italy) , J. Geodynamics, Vol.24, Nos 1-4, pp 67-86. Totaro C., Presti D., Billi A., Gervasi A., Orecchio B., Guerra I., e Neri G.; 2013: The ongoing seismic sequence at the Pollino Mountains, Italy , Seismological Reaserch Letters, Volume 84, No. 6. Totaro C., Seeber L., Waldhauser F., Steckler M., Gervasi A., Guerra I., Orecchio B., and Presti D.; 2015: An intense earthquake swarm in the southernmost apennines: fault architecture from high-resolution hypocenters and focal mechanisms // Bulletin of the Seismological Society of America, Vol 105, No. 6,pp. -, doi:10.1785/0120150074. The 1933 Majella earthquake (central Italy): a reappraisal of the intensity distribution F. Pallone, P. Galli Dipartimento della Protezione Civile, Rome, Italy Introduction. At dawn of September 26, 1933, a strong earthquake struck the southeastern area of the Majella massif, in Abruzzo, damaging heavily several villages, with extensive destruction in Lama dei Peligni, Taranta Peligna and Civitella Messer Raimondo. In the past, this area was hit by a powerful earthquake (1706; Mw=6.6), with a similar mesoseismic area, although with much higher site intensities. Therefore, it is likely that the two events share the same seismogenic source that has remained unknown, so far. The 1933 mainshock occurred at 4:33 AM local time, and was providentially preceded by two foreshocks that alarmed the inhabitants, prompting most of them to escape from their houses. Notwithstanding the large amount of collapses and destructions (Fig. 1), this yielded a relatively little death toll (12 casualties, and less than two hundred injured). In order to enhance the knowledge concerning the highest intensity distribution (Is≥7 MCS), and thus indirectly enlighten the rough location of the causative fault, here we carried out a review of the data collected in the Catalogue of Strong Earthquake in Italy (CFTI4Med; Guidoboni et al. , 2007). As the main source in all the previous studies were the information listed in the newspapers and the works of Cavasino (1935a, 1935b), we performed original archive researches that allowed us to collect new reliable data. Data and materials. The most important and novel data in our study derives from the sources collected by Ridolfi (2005), which was not previously considered in any seismic compilation. This work is entirely devoted to the effects of the 1933 earthquake on the region surrounding the Maiella massif (Abruzzo side). Indeed, Ridolfi (2005), after a thorough research in several archives and libraries, describes the effects of the earthquake and its consequences both in the social and economic context of the time. Data were mainly collected in the: Central State Archive; Banco di Napoli historical archive; historical Archive of the municipality of Avezzano; State Archive of Chieti; State Archive of Pescara; Superintendency of Public Works; Library of the Chamber of Deputies; Library of the Ministry of Agriculture; Library of the Bank Fig. 1 – View of the severe damages in one of the villages east of the Maiella massif (photo Keystone- France/Abruzzes/gettyimages).