The 8M Seismic Network, 2019–2020

 
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 InternationalCC-BY-4.0 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.
DataCite metadata:
HTML | JSON | XML | INSPIRE
Seismic metadata:
fdsnws-station
Network KML file:
To retrieve waveform data and metadata (including instrument responses) for this and other seismic networks, see here.

Extended Network Information for network 8M [hide/show]

Creator(s):
orcid:0000-0002-5109-2633 Barreyre, Thibaut a; orcid:0000-0003-3170-1048 Ottemöller, Lars b; orcid:0000-0001-5570-2753 Schlindwein, Vera c; Pedersen, Rolf B. b; orcid:0000-0002-2393-4514 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):
  1. 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
  2. Crawford, Wayne (2021). obsinfo. Python standalone application for creating FDSN-standard (StationXML).
  3. Crawford, Wayne (2019). OBS data/metadata proposal.
[+] To provide additional references, PIs should contact GEOFON staff.
Place(s):
Loki Castle
Subject(s)a:
Monitoring system
GCMD keyword(s):
Earthquakes Geophysical stations/networks Hydrophones Marine geophysics Seismometers
Funding Reference(s):
Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany

Station List for Network Code 8M

Code
Station description
Begin
End
Loc
Channels
Flags
LOK01
1st site
2019-07-23
2020-07-08
--
CDH CH1 CH2 CHZ
LOK02
2nd site
2019-06-26
2020-07-08
--
HDH HH1 HH2 HHZ
LOK03
3rd site
2019-06-26
2020-07-08
--
HDH HH1 HH2 HHZ
LOK04
4th site
2019-06-26
2020-07-08
--
HDH HH1 HH2 HHZ
LOK05
5th site
2019-06-28
2020-07-09
--
HDH HH1 HH2 HHZ
LOK06
6th site
2019-07-23
2020-07-09
--
CDH CH1 CH2 CHZ
LOK07
7th site
2019-06-28
2020-07-08
--
HDH HH1 HH2 HHZ
LOK08
8th site
2019-06-26
2020-07-08
--
HDH HH1 HH2 HHZ

Database last updated at 2024 Oct 05 14:00:02