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

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

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)2705-2717
Number of pages13
JournalSeismological Research Letters
Volume92
Issue number5
DOIs
Publication statusPublished - Sep 2021

Programme Area

  • Programme Area 3: Energy Resources

Fingerprint

Dive into the research topics of 'Improved seismic monitoring with OBS deployment in the Arctic: A pilot study from offshore western Svalbard'. Together they form a unique fingerprint.

Cite this