Improved Seismic Monitoring with OBS Deployment in the Arctic: A Pilot Study from Offshore Western Svalbard

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1785/0220200471. This is version 1 of this Preprint.

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Authors

Zeinab Jeddi, Lars Ottemöller, Mathilde Bøttger Sørensen , Sara Rezaei, Steven J. Gibbons, Marte L. Strømme, Peter H. Voss, Trine Dahl-Jensen

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.

DOI

https://doi.org/10.31223/X5361S

Subjects

Geophysics and Seismology

Keywords

Mid-ocean ridges, earthquake monitoring, earthquake monitoring, ocean bottom seismographs, ridge seismicity, ocean bottom seismographs, ridge seismicity

Dates

Published: 2021-10-04 16:38

License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
The authors acknowledge there are no conflicts of interest recorded.

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