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Cite as

Schweitzer, Johannes; Schmidt-Aursch, Mechita; Krüger, Frank; Guterch, Alexander (2024): BEAR ISLAND: DEPAS ocean-bottom seismometer operations in the Fram Strait in 2007-2008. GFZ Data Services. Dataset/Seismic Network. doi:10.14470/4P044426.

Identifier

10.14470/4P044426

FDSN network code

9C

DataCite metadata

HTML | JSON | XML | INSPIRE | Local XML source file

Terms/rights

Creative Commons Attribution 4.0 International Available since 2024-07-15

Creator(s)

Schweitzer, Johannes ^a; Schmidt-Aursch, Mechita ^b; Krüger, Frank ^c; Guterch, Alexander ^d
a Norwegian Seismic Array, Lillestrøm, Norway, ^b Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany, ^c University of Potsdam, Germany, ^d Polish Academy of Sciences, Warsaw, Poland

Description

• (Abstract) BEAR ISLAND (The Dynamic Continental Margin Between the Mid-Atlantic-Ridge System (Mohns Ridge, Knipovich Ridge) and the Bear Island Region) is an interdisciplinary project exploring the stress conditions and sources, and the dynamics and deformation characteristics of the continental margin between the Mid-Atlantic Ridge and Bear Island from its top sedimentary cover to its imprint in the upper mantle. In this region the margin includes an extremely thick sedimentary wedge and steep slopes, with at least one major paleo-fracture zone cutting through the wedge. Recent studies in this area indicate very low seismic velocities in the lithosphere and the stress field undergoes an extensional-compressional transition. It is therefore of particular interest to understand the structural architecture, the stress and the dynamics of the whole region because of its natural hazard exposure and the processes involved in the formation of the margin and the opening of the North Atlantic. To achieve this, deep seismic sounding data, as well as records from temporary broadband installations, supplementary to data from existing seismic stations in the region were collected. A key element of the project was the operation of a long-term network of broadband ocean-bottom seismometers (OBS). Additionally, two new broadband seismometers and a small temporary seismic array with 13 sensors were operated. Active seismic refraction/reflection experiments were conducted along two profiles crossing the region and recorded with additional short period OBSs and land stations. Twelve broadband ocean-bottom seismometers (OBS) from the German Instrument Pool of Amphibian Seismology (DEPAS) were deployed as part of this network with RV Horyzont II in September 2007. They were distributed on the Barents shelf, the slope and the deep sea near the Mid-Atlantic Ridge. Nine instruments could be recovered in August 2008 with RV Horyzont II. One instrument was fished before, one was destroyed during recovery and one got lost. Seven stations recorded data for the full deployment period; two stations have no skew value. The time correction for these stations was estimated by noise cross-correlations. Based on previous experiments, the accuracy of the positions is estimated to 500 m. Waveform data is available from the GEOFON data centre, under network code 9C.

Title

BEAR ISLAND: DEPAS ocean-bottom seismometer operations in the Fram Strait in 2007-2008

Publisher

GFZ Data Services

Publication Year

2024

Resource Type

Dataset / Seismic Network

Dates

1. Collected 2007-09-18/2008-09-20
2. Accepted 2024-06-19
3. Submitted 2024-06-24
4. Issued 2024-07-15
5. Created 2024-07-16
6. Available 2024-07-15

Place(s)

1. Fram Strait

Contributor(s)

• Hosting institution: Deutsches GeoForschungsZentrum GFZ
• Data manager: GEOFON Data Centre
• Project members: Norwegian Seismic Array, Lillestrøm, Norway; Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany; University of Potsdam, Germany; Polish Academy of Sciences, Warsaw, Poland

Subjects

• SeisData terms: DEPAS Geophysics Hydrophones MiniSEED OBS Passive seismic Seismometers Temporary Velocity
• GCMD keywords: Marine geophysics Earthquakes Geophysical stations/networks Seismometers Hydrophones

Funding Reference(s)

1. The Research Council of Norway (176069)

Language

en

Sizes

1. 110GB

Reference(s)

FDSN network code

9C

Network dates

2007–2008

Data time range

2007–2008

Station Count

10

Seismic metadata

fdsnws-station FDSN StationXML SC3 XML

To retrieve waveform data and metadata (including instrument responses) for this and other seismic networks, see here. Network (data set) values are taken from DataCite XML with Metadata Properties version 4.4. Contact us if you are the PI and wish to make changes. Old-style network page for this network here.