Ocean bottom seismometers deployed in Tyrrhenian Sea

Dahm, Torsten; Thorwart, Martin; Flueh, Ernst R.; Braun, T.; Herber, Rolf; Favali, P.; Beranzoli, Laura; D’Anna, Giuseppe; Frugoni, F.; Smriglio, G.

doi:10.1029/2002eo000221

Cited by 22 publications

(22 citation statements)

References 9 publications

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“…The OBS were developed in 2005, merging previous design experience mainly by Geomar Kiel (Flueh and Biolas, 1996), the University of Hamburg (Dahm et al, 2002), and the marine engineering firm K.U.M. (Umwelt-und Meerestechnik Kiel).…”

Section: Lobstermentioning

confidence: 99%

Performance report of the RHUM-RUM ocean bottom seismometer network around La Réunion, western Indian Ocean

et al. 2016

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Abstract. RHUM-RUM is a German-French seismological experiment based on the sea floor surrounding the island of La Réunion, western Indian Ocean (Barruol and Sigloch, 2013). Its primary objective is to clarify the presence or absence of a mantle plume beneath the Reunion volcanic hotspot. RHUM-RUM's central component is a 13-month deployment (October 2012 to November 2013) of 57 broadband ocean bottom seismometers (OBS) and hydrophones over an area of 2000 × 2000 km 2 surrounding the hotspot. The array contained 48 wideband OBS from the German DE-PAS pool and 9 broadband OBS from the French INSU pool. It is the largest deployment of DEPAS and INSU OBS so far, and the first joint experiment.This article reviews network performance and data quality: of the 57 stations, 46 and 53 yielded good seismometer and hydrophone recordings, respectively. The 19 751 total deployment days yielded 18 735 days of hydrophone recordings and 15 941 days of seismometer recordings, which are 94 and 80 % of the theoretically possible yields.The INSU seismic sensors stand away from their OBS frames, whereas the DEPAS sensors are integrated into their frames. At long periods (> 10 s), the DEPAS seismometers are affected by significantly stronger noise than the INSU seismometers. On the horizontal components, this can be explained by tilting of the frame and buoy assemblage, e.g. through the action of ocean-bottom currents, but in addition the DEPAS intruments are affected by significant selfnoise at long periods, including on the vertical channels. By comparison, the INSU instruments are much quieter at periods > 30 s and hence better suited for long-period signals studies.The trade-off of the instrument design is that the integrated DEPAS setup is easier to deploy and recover, especially when large numbers of stations are involved. Additionally, the wideband sensor has only half the power consumption of the broadband INSU seismometers.

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Section: Lobstermentioning

confidence: 99%

Performance report of the RHUM-RUM ocean bottom seismometer network around La Réunion, western Indian Ocean

et al. 2016

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“…[5] In the period December 2000 -May 2001 a network of Ocean Bottom Seismometers (OBS) and Ocean Bottom Hydrophones (OBHs) was deployed in the Southern Tyrrhenian Sea during the TYrrhenian Deep sea Experiment (TYDE) [Dahm et al, 2002]. The ocean bottom network consisted in 14 seafloor stations, deployed at depths ranging 1,500-3,500 m b.s.l.…”

Section: Experiments and Seismic Datamentioning

confidence: 99%

Low‐frequency seismic signals recorded by OBS at Stromboli volcano (Southern Tyrrhenian Sea)

Sgroi

Montuori

Agrusta

et al. 2009

Geophysical Research Letters

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[1] Five three-component broadband ocean bottom seismometers (OBSs) were deployed on the seafloor around the Aeolian Islands (Southern Tyrrhenian Sea). By comparing OBSs digital seismograms, we found a lowfrequency seismicity recorded only at OBS05, the nearest seafloor station to Stromboli volcano. This seismicity appears in the form of a continuous seismic signal (tremor-like-signal) as well as a considerable number of shock-like events. We focused on recordings from OBS05 to verify their correlation with Stromboli volcanic activity. From the spectral analysis, we observed low-frequency events (LP events), superposed upon the continuous background noise (tremor). LP events and tremor, showing similar energy fluctuations and frequency content, appear to be produced by the same dynamic processes. We interpret this low-frequency seismicity as probably originating from a continuous uprising of gas bubbles from the deeper part of the Stromboli magmatic column. This could highlight the existence of a deeper source for low-frequency seismicity. Citation: Sgroi, T., C. Montuori, R. Agrusta, and P. Favali (2009), Low-frequency seismic signals recorded by OBS at Stromboli volcano (Southern

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“…In the period December 2000-May 2001, a network of OBS and OBH was deployed in the Southern Tyrrhenian Sea during the Tyrrhenian Deep sea Experiment (TYDE, [14]). One of the TYDE OBS (OBS05 in Figure 1) was deployed near Stromboli Volcano, at a depth of 1500 m and about 16 km SSE from the central axis of Stromboli Island.…”

Section: Strombolimentioning

confidence: 99%

“…Data described and analyzed in this paper were collected by three different systems: for Stromboli by an Ocean Bottom Seismometer (OBS) part of the Tyrrhenian Deep sea Experiment (TYDE) array [14]; for the Marsili seamount, GEOSTAR (GEophysical and Oceanographic STation for Abyssal Research), a stand-alone multidisciplinary observatory; for Etna, NEMO-SN1 (NEutrino Mediterranean Observatory-Seafloor Network 1) , a cabled multidisciplinary observatory [45] located at the Western Ionian EMSO node.…”

Section: Seafloor Observing Systemsmentioning

confidence: 99%

“…Bathymetric map of the Central Mediterranean Sea. The red triangles show three different seafloor systems: a cabled multidisciplinary observatory (NEMO-SN1), an autonomous multidisciplinary observatory (GEOSTAR) and an Ocean Bottom Seismometer (OBS05), part of an array deployed around the Aeolian islands during the Tyrrhenian Deep sea Experiment (TYDE) experiment [14]. NEMO-SN1 is an EMSO node.…”

Section: Introductionmentioning

confidence: 99%

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Observing Volcanoes from the Seafloor in the Central Mediterranean Area

et al. 2016

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Abstract:The three volcanoes that are the object of this paper show different types of activity that are representative of the large variety of volcanism present in the Central Mediterranean area. Etna and Stromboli are sub-aerial volcanoes, with significant part of their structure under the sea, while the Marsili Seamount is submerged, and its activity is still open to debate. The study of these volcanoes can benefit from multi-parametric observations from the seafloor. Each volcano was studied with a different kind of observation system. Stromboli seismic recordings are acquired by means of a single Ocean Bottom Seismometer (OBS). From these data, it was possible to identify two different magma chambers at different depths. At Marsili Seamount, gravimetric and seismic signals are recorded by a battery-powered multi-disciplinary observatory (GEOSTAR). Gravimetric variations and seismic Short Duration Events (SDE) confirm the presence of hydrothermal activity. At the Etna observation site, seismic signals, water pressure, magnetic field and acoustic echo intensity are acquired in real-time thanks to a cabled multi-disciplinary observatory (NEMO-SN1 ). This observatory is one of the operative nodes of the European Multidisciplinary Seafloor and water-column Observatory (EMSO; www.emso-eu.org) research infrastructure. Through a multidisciplinary approach, we speculate about deep Etna sources and follow some significant events, such as volcanic ash diffusion in the seawater.

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Ocean bottom seismometers deployed in Tyrrhenian Sea

Cited by 22 publications

References 9 publications

Performance report of the RHUM-RUM ocean bottom seismometer network around La Réunion, western Indian Ocean

Performance report of the RHUM-RUM ocean bottom seismometer network around La Réunion, western Indian Ocean

Low‐frequency seismic signals recorded by OBS at Stromboli volcano (Southern Tyrrhenian Sea)

Observing Volcanoes from the Seafloor in the Central Mediterranean Area

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