GEOFON 8M Seismic Network

The 8M Seismic Network, 2019–2020

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Network list

Cite as:: Barreyre, Thibaut; Ottemöller, Lars; Schlindwein, Vera; Pedersen, Rolf B; Schmidt-Aursch, Mechita (2023): Project LOKI: DEPAS ocean-bottom seismometer operations at Loki's Castle vent field in 2019-2020. GFZ Data Services. Other/Seismic Network. doi:10.14470/3Z326135.
Network code:: 8M
Type:: Temporary
Network dates^†:: 2019-01-01 to 2020-12-31
Data time range^‡:: 2019–2020
Terms of use:: Creative Commons Attribution 4.0 International Embargoed Available 2025-07-01. Request access
Institution(s):: Alfred-Wegener-Institut, Bremerhaven
Creator(s):: Barreyre, Thibaut; Ottemöller, Lars; Schlindwein, Vera; Pedersen, Rolf B; Schmidt-Aursch, Mechita (LEGACY)
Description*:: Loki Castle Hydrothermal in-situ Experiments and Seismology Surveys (LoCHnESs)
Abstract:: This ocean-bottom seismometer deployment is part of the LoCHnESs (Loki Castle Hydrothermal iN-situ Experiements and Surveys) project examining hydrothermal fluid circulation at Loki's Castle vent field. The project is led by PI Thibaut Barreyre at the Centre for Deep Sea Research, Department of Earth Science, University of Bergen, Norway. A total of 8 ocean bottom seismometers (OBS) were deployed near Loki's Castle vent field at the Mohns-Knipovich Ridge bend, Norwegian-Greenland Sea. The aim of the experiment was to monitor seismicity related to changes in the hydrothermal circulation system and to reveal interaction between an active detachment fault and the axial volcanic ridge hosting the vent site. The network consisted of 8 DEPAS Lobster type broadband OBS from the German Instrument Pool for Amphibian Seismology (DEPAS). Instruments were free-fall deployed and spaced by about 5-8 km. They recorded continuously at 100 Hz for 12 months between July 2019 and July 2020. Two instruments (LOK01 and LOK06) could only be deployed one month later and recorded at 250 Hz. OBS positions at the seafloor were determined by interpolation at 2/3 of the distance between the deployment and recovery position at the seafloor. Position accuracy is estimated to be about 100 m. Skew values were obtained for all stations and reached values of up to 24 s. Clock drift in this experiment was nonlinear. Skew-corrected station LOK02 served as reference station to obtain the clock drift of all other stations using noise cross-correlation and subsequently correct also for the thus determined nonlinearity of time drift.

* Description is taken from seismic metadata, and may not match the preferred title for citations.
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Seismic metadata:: fdsnws-station
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Extended Network Information for network 8M _[hide/show]

Creator(s):

Barreyre, Thibaut ^a;

Ottemöller, Lars ^b;

Schlindwein, Vera ^c; Pedersen, Rolf B. ^b;

Schmidt-Aursch, Mechita ^c
^a Institut de physique du globe de Paris, France, ^b University of Bergen, Norway, ^c Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany

Title:

Project LOKI: DEPAS ocean-bottom seismometer operations at Loki's Castle vent field in 2019-2020

Publisher:

GFZ Data Services

Resource Type:

Other/Seismic Network

Network DOI:

doi:10.14470/3Z326135

Related Reference(s):

Barreyre, Thibaut; Ottemöller, Lars; Schlindwein, Vera; Pedersen, Rolf B; Schmidt-Aursch, Mechita (2023). Project LOKI: DEPAS ocean-bottom seismometer operations at Loki's Castle vent field in 2019-2020. PANGAEA. doi:10.1594/PANGAEA.957222

[+] To provide additional references, PIs should contact GEOFON staff.

Place(s):