GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 GNGTS 2023 Fig. 1: Map view of the seismicity recorded during the first day of the 2012 Emilia seismic sequence. Earthquakes are colour-coded according to their time occurrence. The dots are aftershocks with M L < 4.0. Larger stars are the mainshocks of 20 th May (black) and 29 th May 2012 (pink), while the smaller stars are the aftershocks with M L ≥ 4.0. The Cavone oilfield is shown: the black squares represent the location of wells and the red one is the Cavone14 injection well. The pink rectangle indicates the 2D extension of the Cavone oilfield. Blue and pink curves represent the Ferrara and Mirandola thrust fronts, respectively. In the small inset: the black bold box emphasises the study area. The black arrows represent the stress field of the study area. The grey area is the Apennines foredeep. Fig. 2: 3D V p , V s and V p /V s at 6 km depth (IS2 model) and relocated aftershocks. The light brown dashed line indicates the area with a high V p /V s . The pink line is the Spread Function (SF 2). Pink stars are the mainshocks of 20 th and 29 th ≤ May 2012. Yellow stars are the aftershocks with M L ≥ 4.0. White dots represent the aftershocks with M L < 4.0. The Cavone14 oil well is shown. References Govoni A., Marchetti A., De Gori P., Di Bona M., Lucente F. P., Improta L., Chiarabba C., Nardi A., Margheriti L., Agostinetti N. P., Di Giovambattista R., Latorre D., Anselmi M., Ciaccio M. G., Moretti M., Castellano C. and Piccinini D.; 2014: The 2012 Emilia seismic sequence (Northern Italy): Imaging the thrust fault system by accurate aftershock location . Tectonophysics, http://dx.doi.org/10.1016/j.tecto.2014.02.013 . Pezzo G., De Gori P., Lucente F. P. and Chiarabba C.; 2018: Pore Pressure Pulse Drove the 2012 Emilia (Italy) Series of Earthquakes. Geophysical Research Letters, 45 . https://doi.org/10.1002/2017GL076110 . Schaff D. P and Waldhauser F.; 2005: Waveform Cross-Correlation-Based Differential Travel-Time Measurements at Northern California Seismic Network. Bull. Seism. Soc. Am., Vol.95,No.6,pp.2446–2461, December 2005,doi:10.1785/0120040221. Waldhauser F.; 2001: hypoDD: A Program to Compute Double-Difference Hypocenter Locations (hypoDD version 1.0 - 03/2001) .U.S.G.S, Open File Report 01-113.