GNGTS 2019 - Atti del 38° Convegno Nazionale

94 GNGTS 2019 S essione 1.1 Fig. 1 - left - structural map of the main Plio-Quaternary normal faults (barbs in the hw) and the Mio-Pliocenico Sibillini thrust (triangle in the hw). The seismic ruptures are highlighted and the stars are the epicenters of the main earthquakes. The enclose frame indicate the location of images a) and b). In the right - a) oblique aerial view of SW slope of M. Bicco; in the background M. delle Porche (MP), M. Vettore (MV) and M. Macera della Morte (MdM); b) DSM of the same area of M.Bicco with indicate the coseismic ruptures. length, are present in the summit sector of M. Bove North faces. Some of these ruptures, with a displacement of a few centimeters, had been detected after the October 26th event and then reactivated by the October 30th earthquake. In this area, all the ruptures are located along the SW dipping normal faults that run down through the axial part of the M. Bove anticline. The geological offset of these extensional structures is several hundred meters, with the footwall in Jurassic carbonate bank and the hanging wall in the Upper Jurassic to Lower Cretaceous limestone formations. The main rupture, of a length just over km, is composed of at least three sectors arranged in a right staircase with an average vertical offset of 0.3 m and an average opening of 0.15 m. Another rupture of few hundred meters in length, with a displacement of about 0.15 m, is located along the same NW-SE lineament, in the south-western slope of M. Cornaccione. Northward, other coseismic fractures are mapped in the area of Ussita village, and in the western slope of M. Rotondo, until the M. Banditella. These ruptures are arranged with sectors of many hundred meters of length subdivided into strands of tents meters. The geometry of these later, in the stepped slope, is controlled by gravitational processes affecting the debris and soil cover. The main ruptures are located in the Upper Cretaceous-Eocene limestone and marly-limestone, with a vertical displacement reaching up the meter, with an average of 0.35 m. In the area of Cupi, other coseismic fractures develop in correspondence of an SW dipping normal fault with a geological offset of hundred meters. The coseismic fractures have an average vertical offset of 0.18 m and a horizontal displacement of 0.1 m. It is not clear if these ruptures are connected to the seismic event of 26th or 30th October, because the area was surveyed