Towards a permanent deep sea observatory: The GEOSTAR European experiment

Favali, P.; Smriglio, G.; Beranzoli, Laura; Braun, T.; Calcara, M.; D’Anna, Giuseppe; Santis, Angelo De; Mauro, D. Di; Etiope, Giuseppe; Frugoni, F.; Iafolla, V.; Monna, S.; Montuori, Caterina; Nozzoli, S.; Palangio, P.; Romeo, G.

doi:10.1016/s0928-2009(02)80014-2

Cited by 17 publications

(3 citation statements)

References 6 publications

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“…The teleseismic waveforms collected by the seafloor stations were combined with those from 60 short‐period land stations of RSNC located in southern Italy (Figure 2a), and with the waveforms collected by a hydrophone hosted by GEOSTAR during its contemporary deep sea experiment near Ustica Island (2000 m w.d., September 2000 to April 2001) [ Favali et al , 2002, 2006]. The P and PKP arrival times were picked selecting the first break on the vertical seismograms.…”

Section: Teleseismic Datamentioning

confidence: 99%

Teleseismic tomography of the southern Tyrrhenian subduction zone: New results from seafloor and land recordings

2007

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[1] Teleseismic traveltime data, recorded by temporary ocean bottom seismographs deployed in Tyrrhenian Sea around the Aeolian Islands (Tyrrhenian Deep-sea Experiment (TYDE)), have been used for the first time in Italy to refine the 3-D model for the deep P wave velocity structure of the southern Tyrrhenian subduction zone. The arrival times of 35 teleseisms have been combined with those recorded by the Italian National Network. In order to obtain a more complete azimuthal coverage of teleseismic rays, 80 events recorded by land stations from 1990 to 2002 have been included in the data set. In total, 2904 P and 314 PKPdf phases, 1300 recorded by ocean bottom instruments, have been collected. The upper mantle structure is reconstructed down to 500 km by a nonlinear inversion of the relative residuals computed with respect to the reference 1-D velocity model ak135. The obtained tomographic model has a higher resolution than those previously published thanks to the recordings of TYDE seafloor stations. Tomographic results confirm the presence of the Tyrrhenian slab imaged as a high-velocity body extending from the uppermost mantle down to the bottom velocity model with dip 70-75°NW. The model better defines the geometry of the seismogenic part of the slab. Its lateral extension is about 200 km in the depth interval 150-300 km, where most of the deep seismicity is concentrated. At uppermost mantle depths the fast structure has smaller lateral dimensions (about 100 km). The inversion also points out a wide well-resolved low-velocity zone completely surrounding the steeply dipping fast structure from the lower crust down to about 300 km. This feature suggests the presence of a threedimensional circulation of asthenospheric flow around the Ionian slab caused by retreat and roll-back of the slab. Our results are in agreement with recent laboratory experiments, mantle anisotropy studies, geochemical and isotopic analyses, and modeling based on residual topography.Citation: Montuori, C., G. B. Cimini, and P. Favali (2007), Teleseismic tomography of the southern Tyrrhenian subduction zone: New results from seafloor and land recordings,

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Section: Teleseismic Datamentioning

confidence: 99%

Teleseismic tomography of the southern Tyrrhenian subduction zone: New results from seafloor and land recordings

2007

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“…EMSO has solid historical bases on previous scientific and technological enterprises, such as GEOSTAR (e.g. Beranzoli et al, 2000;Favali et al, 2002;De Santis et al, 2006;Gasparoni et al, 2015) and ORION -Ocean Research by Integrated Observatory Networks-(e.g. Beranzoli et al, 2009;Favali et al, 2011) European Projects and the national project MABEL (e.g.…”

Section: European Multidisciplinary Seafloor and Water Column Observa...mentioning

confidence: 99%

InSEA Project: Initiatives in Supporting the Consolidation and Enhancement of the EMSO Infrastructure and Related Activities

et al. 2022

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The InSEA project (“Initiatives in Supporting the consolidation and enhancement of the EMSO research infrastructure consortium (ERIC) and related Activities”) has the objective, as the full name of the project indicates, to consolidate and strengthen the infrastructures concerning the EMSO (“European Multidisciplinary Seafloor and water column Observatory”) ERIC (European Research Infrastructure Consortium) and all those technical-scientific activities related to it. In particular, the project is upgrading localized and distributed marine infrastructures, laboratories, observatories and spatial measurement activities in Southern Italian seas to support those activities of surveys in fixed time series points of observation of EMSO ERIC. The project is developing according to six implementation Objectives of Research (OR) that involve four National research Institutions: INGV, ISPRA, OGS and Anton Dohrn Zoological Station of Naples. The paper illustrates with more details the relevant objectives of the InSEA project and its most significant implementation phases.

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“…It is comparable to other projects such as Hawaii-2 Observatory H2O (Chave et al, 2002) and VENUS -Versatile Ecomonitoring Network by Undersea-Cable System (Kasahara et al, 2001). ORION is a sequel of GEOSTAR (Favali et al, 2002;Gerber et al, 2001). Basic technologies needed for ORION have been developed during the GEOSTAR project.…”

Section: Bottom Stationmentioning

confidence: 99%

ASTRA: An Automatic Spading Tool for the Remote Application at Abyssal Depths

Clauss

Gerber

Hippe

2003

Volume 3: Materials Technology; Ocean Engineering; Polar and Arctic Sciences and Technology; Workshops

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The future approach of the European marine research programme focuses on the establishment of multi-disciplinary networks including existing systems, and the development of new technologies for efficient installation and near real time communication. Within this framework the European Community funds the networks ORION (Ocean Research by Integrated Observation Networks - GEOSTAR 3) and ESONET 2 (European Seafloor Observatory NETwork) with several European partner institutions involved in marine research. Key technologies for deep-sea research have been developed in the frame of the GEOSTAR project (GEophysical and Oceanographic STation for Abyssal Research - Deep-Sea Mission). The concept comprises: • the deep-sea benthic observatory for geophysical and oceanographic purposes with its unique Data Acquisition and Control System (DACS), • the innovative underwater communication system as near real time interface, and • the deployment and recovery vehicle MODUS (MObile Docker for Underwater Sciences) for precise operations with heavy payloads. The know-how and existing equipment establishes a good basis for extensions and further developments to be used for network projects. ASTRA — an Automated Spading Tool for Remote Applications at abyssal depths — is one of these new concepts. This tool — integrated into the GEOSTAR-Bottom Station (BS) (also called node) and deployed by MODUS — will bury an Ocean Bottom Seismometer (OBS) into the sub-sea soil. The OBS will be laterally displaced to the node and connected by an umbilical. At the end of a long-term mission the node will be recovered by MODUS and the OBS is pulled out of the ground hanging underneath the node. Both components, node and OBS, will be recovered by the surface research vessel. Equipment and procedures developed within the GEOSTAR project have been focused on providing a long-term stationing on the ocean floor to perform scientific measurements. The ASTRA concept takes a next step and aims for the interaction with its environment. Based on the proven and reliable combination of the deep sea shuttle MODUS for heavy load transportation and the payload Bottom Station as the carrier of equipment the new module ASTRA will extend the spectrum of scientific operating possibilities in the deep sea adding engineering services. An iterative process with an integrated design application of a 3D-CAD-system, FEM structural analysis and Multibody Simulation (MBS) characterizes the development phase of ASTRA. Using virtual mock-up critical aspects of handling and operation can be identified, and in consequence more easily avoided. Simulation results are validated by experimental investigations. Operations with the ASTRA prototype and the complete network-system will be performed in the Tyrrhenian Sea in late summer 2003.

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Towards a permanent deep sea observatory: The GEOSTAR European experiment

Cited by 17 publications

References 6 publications

Teleseismic tomography of the southern Tyrrhenian subduction zone: New results from seafloor and land recordings

Teleseismic tomography of the southern Tyrrhenian subduction zone: New results from seafloor and land recordings

InSEA Project: Initiatives in Supporting the Consolidation and Enhancement of the EMSO Infrastructure and Related Activities

ASTRA: An Automatic Spading Tool for the Remote Application at Abyssal Depths

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