The marine activities performed within the TOMO-ETNA experiment

The TOMO-ETNA experiment was planned in order to obtain a detailed geological and structural model of the continental and oceanic crust beneath Mt. Etna volcano and northeastern Sicily up to the Aeolian Islands (southern Italy), by integrating data from active and passive refraction and reflection seismic methodologies, magnetic and gravity surveys. This paper focuses on the marine activities performed within the experiment, which have been carried out in the Ionian and Tyrrhenian Seas, during three multidisciplinary oceanographic cruises, involving three research vessels (\u201cSarmiento de Gamboa\u201d, \u201cGalatea\u201d and \u201cAegaeo\u201d) belonging to different countries and institutions. During the offshore surveys about 9700 air-gun shots were produced to achieve a high-resolution seismic tomography through the wide-angle seismic refraction method, covering a total of nearly 2650 km of shooting tracks. To register ground motion, 27 ocean bottom seismometers were deployed, extending the inland seismic permanent network of the Istituto Nazionale di Geofisica e Vulcanologia (INGV) and a temporary network installed for the experiment. A total of 1410 km of multi-channel seismic reflection profiles were acquired to image the subsurface of the area and to achieve a 2D velocity model for each profile. Multibeam sonar and sub bottom profiler data were also collected. Moreover, a total of 2020 km of magnetic and 680 km of gravity track lines were acquired to compile magnetic and gravity anomaly maps offshore Mt. Etna volcano. Here, high-resolution images of the seafloor, as well as sediment and rock samples, were also collected using a remotely operated vehicle

Diffusive regimes of the motion of bed load particles in open channel flows at low transport stages

The stochasticity of fluid and sediment parameters has been identified as a source of diffusion, particularly anomalous diffusion at different temporal and spatial scales of bed load particle trajectories. Data from two sets of flume experiments are presented, one data set has gravel particle trajectories tracked over a limited area and was used in identifying the influence of different shear stress conditions on diffusive processes. A new experiment was performed using spherical particles moving as bed load in an annular flume in order to address concerns about censorship effects caused by the size of the detection window. An annular flume allowed collection of practically uncensored particle trajectories over longer time period than has been previously possible in the laboratory. Three diffusive regimes were observed at distinct stages of particle motion: (i) ballistic regime at the local range; (ii) Fickian diffusion at the intermediate range; (iii) subdiffusion at the global range. Characteristic time scales separate the regimes and correlate with the mean traveling and resting times of particles. Fickian diffusion in the intermediate range is first recognized as a result of the balance between intermittent weak transport and near-bed turbulence, as first predicted by Nikora et al. (2002, https://doi.org/10.1029/2001WR000513). In the global range, extreme values were observed in the distribution of particle resting times, suggesting that two types of distributions (related to surface motion and vertical mixing) were responsible for the subdiffusion at longer time scales. Diffusion was found to be anisotropic at all stages of particle motion

The Ross Sea 2013 geological expedition: the Italian-Korean collaboration and preliminary results.

In February 2013 the Korean oceanographic cruise ANA03B was conducted on board of the IBRV ARAON (Kopri) in the Ross Sea (Antarctica). During the cruise a collaborative work between Korea and Italy was performed. The Italian participation was supported by PNRA in the framework of the ROSSLOPE Project (Past and present sedimentary dynamic in the ROSS Sea: a multidisciplinary approach to study the continental SLOPE ). The goal of the Rosslope and Kopri team collaboration was to collect geophysical and sedimentological data in the Central Basin area. In this presentation we report the preliminary results

Tavola 8 Calabria Ionica

Questo volume rappresenta il primo Atlante dei lineamenti di pericolosit\ue0 geologica dei mari italiani, prodotto dalla comunit\ue0 scientifica italiana dei Geologi Marini ed ha come obiettivo la divulgazione di diversi importanti risultati scientifici: la mappatura dei lineamenti di pericolosit\ue0 geologica individuati sui fondali circostanti le coste italiane (produzione di 72 Fogli e 15 Tavole); la creazione di un database (Infor.mare) contenente tutte le informazioni esistenti sulla geologia dei mari italiani; la mappatura e la gerarchizzazione dei punti di criticit\ue0 ricadenti nei 72 Fogli. Inoltre, la stampa e pubblicazione dell\u2019opera permetter\ue0 di mettere in risalto l\u2019importanza della realizzazione di tali carte tematiche che costituiscono uno strumento conoscitivo di cui il Dipartimento della Protezione Civile (DPC) potr\ue0 disporre per la gestione dei rischi territoriali, ma anche come base di attivit\ue0 di ricerca in aree marine geologicamente complesse e in gran parte ancora poco conosciut