GNGTS 2014 - Atti del 33° Convegno Nazionale

114 GNGTS 2014 S essione 3.1 D’Angelo U., Vernuccio S.; 1992: Carta geologica del Foglio 617 “Marsala” scala 1:50.000. In Bollettino Società Geologica Italiana, Vol. 113, Roma. D’Angelo U., Vernuccio S.; 1994: Note illustrative della Carta Geologica del Foglio 617 “Marsala” (scala 1:50.000). Boll. Soc. Geol. It., CXIII, 55-67. MacGregor F., Fell R., Mostyn G.R., Hocking G. and McNally G.; 1994: The estimation of rock rippability . ��������� Quarterly Journal of Engineering Geology and Hydrogeology, v. 27, p. 123-144, Ruggieri G., Unti A., Unti M. e Moroni M.A.; 1977: La calcarenite di Marsala (pleistocene inferiore) e i terreni contermini. Estratto dal Bollettino Società Geologica Italiana, 94,1623-1655, 2 ff. Roma. Scales, J.A.; 1987: Tomography inversion via conjugate gradient method . ���������� ��� �������� ���� Geophysics 52, 179-185, doi: 10.1190/1.144.2293. Stefani, J. P.; 1995: Turning-ray tomography. Geophysics. 60, 1917-1929. Whiteley R.J., Stewart ����� S.B.; 2008: Case studies of shallow marine investigations in Australia with advanced underwater seismic refraction (USR). Exploration Geophysics 39(1) 34–40. Young Ho Cha, Churl-Hyun Jo, and Jung Hee Suh; 2003: Water Bottom Seismic Refraction Survey for Engineering Applications . Geosystem Eng., 6(2), 40-45. Zelt C.A.; 1998: Lateral velocity resolution from three-dimensional seismic refraction data . Geophysical J. Int., 135, 1101-1112. Zelt C.A., Azaria A. and Levander A.; 2006: 3D seismic refraction traveltime tomography at a ground water contamination site . ����������� ��� �������� Geophysics, 71, H67-H78. A seismic survey at Adventdalen, Svalbard Islands, (Norway), for permafrost studies: the IMPERVIA project G. Rossi 1 , F. Accaino 1 , J. Boaga 2 , L. Petronio 1 , R. Romeo 1 , W. Wheeler 3 1 OGS - Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy 2 Dipartimento di Geoscienze, Università di Padova, Italy 3 Centre for Petroleum Research (CIPR), University of Bergen, Norway Introduction. Climate warming and permafrost thawing would allow the release into the atmosphere of any greenhouse gasses trapped beneath. Research to date has focussed mainly on the upper fifteen meters of the permafrost as this reacts most rapidly to changes in air temperature. Little focus is given to the deeper permafrost, which may be a good long-term climate indicator. Knowledge of the fluids (waters or gases) present within and beneath the permafrost allows evaluation of the impact of atmospheric release upon thawing. Svalbard archipelago is an ideal natural peri-arctic laboratory for such a kind of studies. The fluid circulation and permafrost characteristics are constrained by a series of pingos (periglacial mounds of Earth-covered ice), shallow (< 50 m) and a few deep (to 970 m) wells. Near Longyearbyen, in the Adventdalen (Advent Valley), where the Longyearbyen CO2Lab is located (Braathen et al. , 2012), deep-target 2D reflection and borehole seismic data are available (Oye et al. , 2013). However, no studies targeted full-thickness permafrost characterization, or determining its relation with regional hydrology are available. These considerations motivated the present study, done within the PNRAproject IMPERVIA - Integrated Methods to study PERmafrost characteristics and Variations In an Arctic natural laboratory (Svalbard). The project is led by OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy), in collaboration with CIPR (������ ��� ��������� Centre for Petroleum Research, Bergen University, Norway), UNIS (University Centre in Svalbard, Longyearbyen, Norway), and the Department of Geosciences, University of Padua, Italy. ��� ��� �� �� ������� The aim is to combine exploration geophysical tools (2D and 3D) to image and characterize the mid- to lower permafrost, to determine the aquifer architecture (bedrock and fluvio-glacial deposits). Such information can be useful to state permafrost capability of acting as additional cap-rock to future injected CO 2 . Since the fluid flow from pingos indicates significant fluid circulation