GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione A matrice 17 Cello G., Deiana G., Mangano P., Mazzoli S., Tondi E., Ferreli L., Maschio L., Michetti A.M., Serva L. & Vittori E.; 1998: Evidence for surface faulting during the september 26, 1997, Colfiorito (Central Italy) earthquakes. Journal of Earthquake Engineering, 2, pp. 1-22, Imperial College Press, U.K. Central Italy Earthquake Working Group, 2016: The August 24, 2016, Amatrice earthquake (Mw 6.0):   field evidence of on-fault effects . Preliminary report, 31p. ; https://t.co/QpOyZGbyWd Claesson L., Skelton A., Graham C., Dietl C., Mörth M., Torssander P., Kockum I.; 2004: Hydrogeochemical changes before and after a major earthquake . Geology, 32, pp. 641-644. EMERGEO Working Group; 2016: The 24 August 2016 Amatrice Earthquake Coseismic Effects . Version of 04.09.2016, 7p; https://ingvterremoti.files.wordpress.com/2016/09/emergeo_report_v1eng.pdf Fubelli, G., Gori, S., Falcucci, E., Galadini, F., & Messina, P.; 2009: Geomorphic signatures of recent normal fault activity versus geological evidence of inactivity: Case studies from the central Apennines (Italy) . Tectonophysics, 476, pp. 252-268. Gruppo di Lavoro INGV sul terremoto di Amatrice; 2016: Secondo rapporto di sintesi sul Terremoto di Amatrice Ml 6.0 del 24 Agosto 2016 (Italia Centrale) . doi: 10.5281/zenodo.154400 Mildon, Z. K., Roberts, G. P., Walker, J. P. F., Wedmore, L. N., & McCaffrey, K. J.; 2016: Active normal faulting during the 1997 seismic sequence in Colfiorito, Umbria: Did slip propagate to the surface? . Journal of Structural Geology, 91, pp. 102-113. Segre A. G.; 1950: Sulla struttura dell’arco abruzzese interno . La Ricerca Scientifica, Suppl. Contr. Sc. Geol, 20, CNR, Roma, pp. 98-111. Serva L., Vittori E., Comerci V., Esposito E., Guerrieri L., Michetti A.M., Mohammadioun B., Mohammadioun G.C., Porfido S., Tatevossian R.E.; 2016: Earthquake Hazard and the Environmental Seismic Intensity (ESI) Scale . Pure and Applied Geophysics (PAAG), 173, pp. 1479 - 1515, doi: 10.1007/s00024-015-1177-8. Tsunogai U. and Wakita, H.; 1995: Precursory chemical changes in ground water: Kobe earthquake, Japan . Science, 269, pp. 61-63. Wells, D. L. and Coppersmith, K. J.; 1994: New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement . Bulletin of the seismological Society of America, 84, pp. 974- 1002. On the significance of the Mt. Vettore surface ruptures A.M. Blumetti, V. Comerci, P. Di Manna, F. Fumanti, G. Leoni, L. Guerrieri, E. Vittori ISPRA – Istituto Superiore per la Protezione e la Ricerca Ambientale, Roma, Italy The August 24, 2016, central Italy earthquake (Mw 6.0; http://cnt.rm.ingv.it/tdmt ) was associated to well evident seismically-induced ground ruptures along the ”Cordone del Vettore” fault trace and along the Mt. Vettoretto fault, which is its supposed southern continuation, throughout a right step (Fig. 1). The “Cordone del Vettore” fault runs in the upper part of the southwest-facing Mt. Vettore fault escarpment (Blumetti, 2011; Pierantoni et al. , 2013), marked by a clear tectonic contact between Mesozoic limestones and slope deposits. In addition, minor and much less continuous reactivations were observed along other fault strands of the Vettore fault system located downslope, e.g. mid-slope of the Mt. Vettore and south of the Vettoretto rupture. Instead, the supposed main fault located at the foot of the slope bounding the Castelluccio Basin did not display any evidence of coseimic reactivation. The NW-SE trending surface ruptures along the “Cordone del Vettore” fault were surveyed in large detail, with significant continuity for a total length of about 3 km. Most commonly, the ruptures have affected colluvial and debris deposits overhanging the bedrock fault plane, but somewhere even the very fault mirror. The observed displacements were ranging from 5 to 15 cm in its northern part and from 5 to 25 cm southward, reaching 30 cm only at one site at its southern tip; heave generally ranged from 5 to 25 cm (see also EMERGEO Working Group, 2016). The set of ground ruptures observed along the Mt. Vettoretto fault were mainly NNW-SSE trending, with a slight left-lateral component. They generally affected colluvium and soil, often