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Improved seismic monitoring with OBS deployment in the Arctic: A pilot study from offshore western Svalbard

Jeddi, Zeinab; Ottemöller, Lars; Sørensen, Mathilde Bøttger; Rezaei, Sara; Gibbons, Steven John; Strømme, Marte L.; Voss, Peter H.; Dahl-Jensen, Trine
Journal article, Peer reviewed
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URI
https://hdl.handle.net/11250/2788909
Date
2021
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  • Department of Earth Science [837]
  • Registrations from Cristin [5248]
Original version
Seismological Research Letters. 2021, 92 (5), 2705-2717.   10.1785/0220200471
Abstract
The mid‐ocean ridge system is the main source of earthquakes within the Arctic region. The earthquakes are recorded on the permanent land‐based stations in the region, although, smaller earthquakes remain undetected. In this study, we make use of three Ocean Bottom Seismographs (OBSs) that were deployed offshore western Svalbard, along the spreading ridges. The OBS arrival times were used to relocate the regional seismicity, using a Bayesian approach, which resulted in a significant improvement with tighter clustering around the spreading ridge. We also extended the regional magnitude scales for the northern Atlantic region for OBSs, by computing site correction terms. Besides location and magnitude improvement, the OBS network was able to detect hundreds of earthquakes, mostly with magnitude below Mw 3, including a swarm activity at the Molloy Deep. Our offshore observations provide further evidence of a low‐velocity anomaly offshore Svalbard, at the northern tip of Knipovich ridge that was previously seen in full‐waveform inversion. We conclude that even a single permanent OBS near the ridge would make a significant difference to earthquake catalogs and their interpretation.
Description
Postponed access: the file will be available after 2022-03-31
Publisher
Seismological Society of America
Journal
Seismological Research Letters
Copyright
Copyright Seismological Society of America

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