The main objective of the CHIANTI-1 cruise (Calabrian Arc Hazards in IoniAN and TyrrhenIan Seas, Fig. 1) is to collect several transects of deep penetrating wide angle seismic (WAS) data, together with sediment profiler and multi-beam bathymetry data, across the Ionian and Tyrrhenian seas to determine the deep crustal structure and plate geometry of the whole subduction system, from the frontal wedge to the arc and back-arc. The goal is to study the processes that operated during the subduction of the Ionian slab of oceanic crust under Calabria, which lead to the development of the Aeolian volcanic arc, and the subsequent opening of the Tyrrhenian basin, and are responsible of the geological hazards that threaten the region. In addition, the data acquired will allow us to improve the knowledge on the interrelationships between tectonics and magmatism to define the most significant geological hazards, including large earthquakes, tsunamis, submarine landslides, and volcanic eruptions. The data were collected using a temporary network deployed for few days (from 22 July to 2 August 2015) on the sea floor, with a series of Ocean Bottom Seismometers and Hydrophones (OBS/H, Fig. 2). The experiment also included the in land recording with permanent and mobile seismic stations managed and deployed by UniCal (Fig. 3). The mobile stations were located along the on-land transect Francavilla Angitola - Montepaone. The source of energy to acquire the data was an array of airguns with a total capacity of ~4750 c.i. The explored WAS transects were located both in Ionian and Tyrrhenian seas (Fig. 1). During the cruise were followed all necessary measures to minimize underwater acoustic impact on marine life. Measures include continuous monitoring of the research activities by a team of three Marine Mammal Observers (MMOs) using both visual and Passive Acoustic Monitoring (PAM) systems. Here we present the preliminary results (pre-processing) of the data recorded by the on-land stations. The sea-land data will be later processed and integrated with OBS/H-WAS data and interpreted together with multichannel data, in order to construct models of the tectonic features and the seismic velocity structures of the crust and upper mantle.
WIDE-ANGLE SEISMIC CHIANTI-1 PROJECT: SEA-LAND ACQUISITION AND PRELIMINARY RESULTS
R de Franco;G Caielli;N Zitellini;M Ligi;
2015
Abstract
The main objective of the CHIANTI-1 cruise (Calabrian Arc Hazards in IoniAN and TyrrhenIan Seas, Fig. 1) is to collect several transects of deep penetrating wide angle seismic (WAS) data, together with sediment profiler and multi-beam bathymetry data, across the Ionian and Tyrrhenian seas to determine the deep crustal structure and plate geometry of the whole subduction system, from the frontal wedge to the arc and back-arc. The goal is to study the processes that operated during the subduction of the Ionian slab of oceanic crust under Calabria, which lead to the development of the Aeolian volcanic arc, and the subsequent opening of the Tyrrhenian basin, and are responsible of the geological hazards that threaten the region. In addition, the data acquired will allow us to improve the knowledge on the interrelationships between tectonics and magmatism to define the most significant geological hazards, including large earthquakes, tsunamis, submarine landslides, and volcanic eruptions. The data were collected using a temporary network deployed for few days (from 22 July to 2 August 2015) on the sea floor, with a series of Ocean Bottom Seismometers and Hydrophones (OBS/H, Fig. 2). The experiment also included the in land recording with permanent and mobile seismic stations managed and deployed by UniCal (Fig. 3). The mobile stations were located along the on-land transect Francavilla Angitola - Montepaone. The source of energy to acquire the data was an array of airguns with a total capacity of ~4750 c.i. The explored WAS transects were located both in Ionian and Tyrrhenian seas (Fig. 1). During the cruise were followed all necessary measures to minimize underwater acoustic impact on marine life. Measures include continuous monitoring of the research activities by a team of three Marine Mammal Observers (MMOs) using both visual and Passive Acoustic Monitoring (PAM) systems. Here we present the preliminary results (pre-processing) of the data recorded by the on-land stations. The sea-land data will be later processed and integrated with OBS/H-WAS data and interpreted together with multichannel data, in order to construct models of the tectonic features and the seismic velocity structures of the crust and upper mantle.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
