GNGTS 2014 - Atti del 33° Convegno Nazionale

84 GNGTS 2014 S essione 1.1 and Amato (1997) as deep carbonates stacked in large scale thrust by the former compression. These authors speculated that the lower crustal material can have been involved in the thrusting. Improta et al. (2000), based on a joint interpretation of a 2D seismic profile and deep well data, explained the observed shallow high Vp material in terms of the Apulian platform involved in the compressional tectonics. The above suggests that the top of theApulian platform has a strong wavy trend beneath the Matese Massif. ��� ���������� �� ��� ���� ����� �������� ���� ��� The hypocenter of the main shock suggests that the causative fault of the 2013-14 sequence has a focal depth at about 18 km. Under the hypothesis that just beneath the ������ ������� ����� ��� �������� ��������� ��� ������� �������� �� �� Matese Massif, where the sequence nucleate, the Apulian platform is at a depth of about 10 km, the ����� ������ �� ������� �������� ������ ��� ����� �� ������� ����� focal volume is largely confined within the crust of Apulia, being only very few events occurred sparsely within its sedimentary cover. In other words, seismicity of this sequence stopped within the Apulia platform and did not interest the overlying Molisan and Matese units. The top of the ������� �������� ����� ���� ����� �� � ������� ��� ��� ������� Apulian platform could have ����� �� � ������� ��� ��� ������� acted as a barrier for the upwards propagation of ��� ������� �������� �������������� ��� �������� �� � ������ ���������� ����� the seismic release. Alternatively, the presence of a strong absorption small layer, with very low rigidity, between the top of the Apulian platform and ��� ����������� ����� its sedimentary cover might be the cause of the no upwards propagation of the seismic release. ������� However, in ���� �� case of earthquake with magnitude greater than that with ML= 4.9 that occurred on December 29, 2013, it is not to exclude that a little layer with strong absorption could be transparent and the upwards propagation of the seismic release could activate little superficial fault segments. References Bisio, L., Di Giovambattista R., Milano, G., Chiarabba, C., 2004. ����������������� ���������� ��������� ��� ����� Three-dimensional earthquake locations and upper crustal structure of the Sannio-Matese region (southern Italy). �������������� ���� ���� ���� Tectonophysics 385, 121– 136. CNR-PFG, 1983. ����������� ��� �� ������ ������������� ������������� ���� �������� ����� ����� ����� ���������� Neotectonic map of Italy. Sottoprogetto Neotettonica, Dir. Barberi, Coor. ����� ����� ���������� Bosi, Scale 1:500,000, Sheet 4. Chiarabba, C., Amato, A., 1997. Upper-crustal structure of the Benevento area (southern Italy): fault heterogeneities and potentialfor large earthquakes. Geophys. J. Int. 130, 229– 239. De Gori, P., Moretti, M., Margheriti, L., Cecere, G., Aladino Covoni, A., Criscuoli, F., Mazza, S., Lauciani, V., D’ambrosio, C., Castagnozzi, A., Mammolo, A., Migliari F., Minichiello, F., Cardinale, V., Falco, L., Zarrilli, L., De Luca, G., Abruzzese, L., Delladio, A., Scognamiglio, L., Nichelini, A., (2014). Le attività di pronto intervento sismico dell’INGV a seguito del terremoto del 29 Dicembre 2013 (area del Matese). Rapporti Tecnici INGV 2014, No 281, ISSN 2039-7941. DISS Working Group, 2010. Database of Individual Seismogenic Sources (DISS), Version 3.1.1: A compilation of potential sources for earthquakes larger than M 5.5 in Italy and surrounding areas. http://diss.rm.ingv.it/diss/ , © INGV 2010 - Istituto Nazionale di Geofisica e Vulcanologia - All rights reserved. doi: 10.6092 /INGV.IT - DISS3.1.1. Fracassi, U., Milano, G., 2014. A soft linkage between major seismogenic fault systems in the central-southern Apennines (Italy): Evidence from low-magnitude seismicity. �������������� ������ �� ������ ������������� � ��������� Tectonophysics (2014) in press; http://dx.doi . org/10.1016/j.tecto.2014.08.002 Improta, L., Iannaccone, G., Capuano, P., Zollo, A., Scandone, P., 2000. ���������� �� ��� ����� ������� ��������� Inferences on the upper crustal structure of Southern Apennines (Italy) from seismic refraction investigations and subsurface data. �������������� ���� Tectonophysics 317, 273– 297. Lee, W.H.K., Lahr, J.C., 1975. HYPO71 (revised): a computer program for determining hypocenter, magnitude, and first motion pattern of local earthquakes. US Geological Survey Open File Report 75-311. US Geological Survey, Washington, DC. Milano, G., Di Giovambattista, R., Alessio, G., 1999. ����������� ������ �� ��� �������� ��������� ����� �������� Earthquakes swarms in the Southern Apennines chain (Italy): the 1997 seismic sequence in the Sannio-Matese mountains. Tectonophysics 306, 57-78. Milano, G., Ventura, G., Di Giovambattista, R., 2002. ������� �������� �� ������������ ��������� �� ��� �������� Seismic evidence of longitudinal extension in the Southern Apennines chain (Italy): the 1997-1998 Sannio-Matese seismic sequence. ����������� �������� ������� ��� �� Geophysical Research Letters 29, NO 20, 65.1-65.4. Milano, G., Di Giovambattista, R., Ventura, G., 2005. ��� ���� ������� �������� ���� ������� �������� ������������ The 2001 seismic activity near Isernia (Italy): Implications for the seismotectonics of the Central-Southern Apennines. �������������� ���� �������� ���� �������� Tectonophysics 401, 167-178. doi: 10.1016/ j.tecto.2005.03.010. Milano, G., Di Giovambattista, R., Ventura, G., 2008. ������� �������� �� ��� ���������� ���� ������� �������� ��� Seismic activity in the transition zone between Southern and Central Apennines (Italy): Evidences of longitudinal extension inside the Ortona-Roccamonfina tectonic line. Tectonophysics 457, 102-110. doi: 10.1016/j.tecto.2008.05.034. Reasenberg, P., and D. Oppenheimer, FPFIT, FPPLOT and FPPAGE: Fortran computer programs for calculating and displaying earthquake fault plane solutions, U.S. Geol. Surv., Open File Rep., 85– 739, 1985.

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