Abstract
During the winter 2012, from 20 January to 4 February, the German oceanographic FS METEOR cruise (M86/3) took place in the central-southern Adriatic Sea in the frame of “Adria LithosPHere InvestigAtion” (ALPHA [Kopp et al., 2013]). The primary goal of the project was high-resolution tomographic imaging of the crust and lithospheric mantle underneath the southern Adriatic Sea, the Apulia eastern margin and the external zone of the Dinaric thrust-belt by collecting offshore-onshore seismic data along three multi-fold wide-aperture profiles. The definition of reliable velocity models of the Adriatic lithosphere was considered crucial for a better understanding of the structure, fragmentation, geodynamic evolution, and seismotectonics of the Adria-Apulia microplates. The ALPHA Project was coordinated by Helmholtz Centre for Ocean Research Kiel, Germany (GEOMAR), former Leibniz Institute of Marine Sciences (German: Leibniz-Institut fur Meereswissenschaften, IFM-GEOMAR) and conducted in close cooperation with different European institutions of Germany, Albania, Croatia, Italy and Montenegro. The Istituto Nazionale di Geofisica Vulcanologia (INGV) participated by deploying land stations along two transects in the Apulia and Gargano Promontory to extend westwards the seismic profiles. The primary goal was to record shallow-to-deep seismic phases travelling along the transition between the Adriatic basin and the Apulia foreland. In this paper we present the field work related to the two Italian onshore transects, the recorded data, and the processing flow developed to highlight crustal and mantle refractions and wide-angle reflections.
Highlights
During the winter 2012, from 20 January to 4 February, the German oceanographic FS METEOR cruise (M86/3) took place in the centralsouthern Adriatic Sea in the frame of “Adria LithosPHere InvestigAtion” (ALPHA [Kopp et al, 2013])
The “Adria LithosPHere InvestigAtion” (ALPHA [Kopp et al, 2013]) active seismic experiment was performed during the winter 2012 (20 January – 04 February) in the central-southern Adriatic Sea and surrounding onshore regions
The ALPHA Project was coordinated by GEOMAR (Kiel, Germany) and conducted in close cooperation with German and European institutions (GFZ, ETH, Seismological Observatory of Montenegro, University of Tirana, Istituto Nazionale di Geofisica e Vulcanologia - Istituto Nazionale di Geofisica Vulcanologia (INGV), Istituto di Scienze Marine of the Centro Nazionale delle Ricerche – ISMAR)
Summary
The “Adria LithosPHere InvestigAtion” (ALPHA [Kopp et al, 2013]) active seismic experiment was performed during the winter 2012 (20 January – 04 February) in the central-southern Adriatic Sea and surrounding onshore regions. The goal was to record shallowto-deep phases travelling across the transition between the Adriatic basin and the Apulia foreland In this manuscript we illustrate: (i) the onshore experiment, (ii) the processing flow developed to improve data. We show that a careful frequency-time analysis of the data allowed to design optimal filters aimed at identifying very weak first arrivals in the intermediate-large offset range These steps of the developed processing flow were of key importance because the recognition of primary head waves on the record sections was hampered by shadow zones associated to low-Vp layers placed at the base of the Apulian sedimentary cover
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