Geostar: Geophysical and oceanographic station for abyssal research

Beranzoli, Laura; Braun, T.; Calcara, M.; Calore, D.; Campaci, R.; Coudeville, J.-M.; Santis, Angelo De; Mauro, D. Di; Etiope, Giuseppe; Favali, P.; Frugoni, F.; Fuda, Jean-Luc; Gamberi, Fabiano; Gasparoni, F.; Gerber, Hans; Marani, M.; Marvaldi, J.; Millot, Claude; Montuori, Caterina; Romeo, G.; Palangio, P.; Smriglio, G.

doi:10.1016/s0422-9894(02)80036-8

Cited by 7 publications

(7 citation statements)

References 3 publications

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“…3. An integrated monitoring system including measurements of deformation and seismicity also in offshore areas [e.g., Beranzoli et al , 1998, 2000] will significantly contribute in knowing the evolution of the seismogenic apparatus and therefore in mitigating the earthquake and tsunami hazards in this densely populated region.…”

Section: Discussionmentioning

confidence: 99%

Seismotectonics of the Nubia plate compressive margin in the south Tyrrhenian region, Italy: Clues for subduction inception

Billi¹,

Presti²,

Faccenna³

et al. 2007

J. Geophys. Res.

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[1] Seismological and structural data are used to constrain the active tectonics of the Nubia plate compressive margin in southern Italy. In this region, compressional displacements have resumed at the rear of the Maghrebian orogenic wedge since about 700-500 ka and are presently accommodated along a seismic belt in the south Tyrrhenian area, where a passive margin has developed during late Neogene-Quaternary times. Earthquake data from the south Tyrrhenian belt are analyzed with Bayloc, a probabilistic nonlinear location method. Results show that the seismic belt is segmented and involves a series of NE-SW and NW-SE elongated clusters. The NE-SW clusters are interpreted as high-angle reverse fault zones verging toward the southeast, whereas the perpendicular clusters are interpreted as possible strike-slip fault zones transferring the contractional displacements to advanced segments of the belt in the southeast. Brittle deformations observed in the Quaternary volcanic island of Ustica are consistent with the geometry and kinematics of the seismic belt deduced from the seismological data. The south Tyrrhenian active belt may constitute an early stage of subduction of the Tyrrhenian oceanic crust beneath Sicily. A similar scenario has been hypothesized also for the westward prolongation of the south Tyrrhenian belt off the Algerian coast. By integrating instrumental and historical seismic data with tectonic evidences, we infer that the south Tyrrhenian belt is probably capable of producing earthquakes with a maximum size close to magnitude 7. The analyzed data suggest a multifault system behavior for the studied compressional belt. This inference is important to estimate and mitigate the seismic and tsunamic hazards in such a densely populated region.

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Section: Discussionmentioning

confidence: 99%

Seismotectonics of the Nubia plate compressive margin in the south Tyrrhenian region, Italy: Clues for subduction inception

Billi¹,

Presti²,

Faccenna³

et al. 2007

J. Geophys. Res.

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“…A detailed description of the GEOSTAR system is available in recent literature (e.g., Beranzoli et al, 1998Beranzoli et al, , 2000Gasparoni et al, 2002, Marvaldi et al, 2002. Only a schematic description of the system is given here.…”

Section: Geostar System Descriptionmentioning

confidence: 99%

Mission results from the first GEOSTAR observatory (Adriatic Sea, 1998)

et al. 2014

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We assess the first mission of the GEOSTAR (GEophysical and Oceanographic STation for Abyssal Research) deep-sea multidisciplinary observatory for its technical capacity, performance and quality of recorded data. The functioning of the system was verified by analyzing oceanographic, seismological and geomagnetic measurements. Despite the mission's short duration (21 days), its data demonstrated the observatory's technological reliability and scientific value. After analyzing the oceanographic data, we found two different regimes of seawater circulation and a sharp and deepening pycnocline, linked to a down-welling phenomenon. The reliability of the magnetic and seismological measurements was evaluated by comparison with those made using on-land sensors. Such comparison of magnetic signals recorded by permanent land geomagnetic stations and GEOSTAR during a "quiet" day and one with a magnetic storm confirmed the correct functioning of the sensor and allowed us to estimate the seafloor observatory's orientation. The magnitudes of regional seismic events recorded by our GEOSTAR seismometer agreed with those computed from land stations. GEOSTAR has thus proven itself reliable for integrating other deep-sea observation systems, such as modular observatories, arrays, and instrumented submarine cables.

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“…Among the ongoing experiments, GEOSTAR, which beat out many other project proposals in a European competition for funding, answers the request to make available a marine intervention system on future benthic stations and networks, able to limit the costs of the operations [Beranzoli et al, 1998] .The design principles of the GEOSTAR prototype include sea-surface operations for deploy ment and recovery without the use of ROVs, power autonomy, modularity, and the ability to host many different experiments, multipara meter measurements, and near real-time data transmission.The installation requirements of some instruments (effective coupling to the ground, orientation, minimization of electrical disturbances, protection against the water cur rents) have been fulfilled thanks to particular attention brought to the design of the GEOSTAR frame.…”

Section: Long-term Seafloor Observatoriesmentioning

confidence: 99%

European seafloor observatory offers new possibilities for deep‐sea study

Favali

Smriglio

Beranzoli³

et al. 2000

EoS Transactions

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The Geophysical and Oceanographic Station for Abyssal Research (GEOSTAR), an autonomous seafloor observatory that collects measurements benefiting a number of disciplines during missions up to 1 year long, will begin the second phase of its first mission in 2000. The 6–8 month investigation will take place at a depth of 3400 m in the southern Tyrrhenian basin of the central Mediterranean. GEOSTAR was funded by the European Community (EC) for $2.4 million (U.S. dollars) in 1995 as part of the Marine Science and Technology programme (MAST). The innovative deployment and recovery procedure GEOSTAR uses was derived from the “two‐module” concept successfully applied by NASA in the Apollo and space shuttle missions, where one module performs tasks for the other, including deployment, switching on and off, performing checks, and recovery. The observatory communication system, which takes advantage of satellite telemetry, and the simultaneous acquisition of a set of various measurements with a unique time reference make GEOSTAR the first fundamental element of a multiparameter ocean network.

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Geostar: Geophysical and oceanographic station for abyssal research

Cited by 7 publications

References 3 publications

Seismotectonics of the Nubia plate compressive margin in the south Tyrrhenian region, Italy: Clues for subduction inception

Seismotectonics of the Nubia plate compressive margin in the south Tyrrhenian region, Italy: Clues for subduction inception

Mission results from the first GEOSTAR observatory (Adriatic Sea, 1998)

European seafloor observatory offers new possibilities for deep‐sea study

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