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Klenke, Martin; Schenke, Hans Werner

doi:10.1023/a:1025764206736

Cited by 46 publications

(8 citation statements)

References 12 publications

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“…Out of these, most interesting was an earthquake swarm that occurred on 20 May 2019 at the Molloy Deep close to OBIN1 (Figure 5). Molloy Deep is a ridge-transform intersection and the deepest point in the Arctic Ocean at ~5600 m (Klenke and Schenke, 2002).…”

Section: Discussionmentioning

confidence: 99%

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

Jeddi

Ottemöller

Sørensen

et al. 2021

Seismological Research Letters

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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.

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Section: Discussionmentioning

confidence: 99%

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

Jeddi

Ottemöller

Sørensen

et al. 2021

Seismological Research Letters

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“…However, the sill depth is cited as 2600 m in literature and studies of the bottom bathymetry in the Fram Strait show a very complex structure (e.g., Klenke and Schenke, 2002). We have on the 79 • N sections 1-7 stations that reach deeper than 2600 m. Should we use that as a limiting depth, we would need an extra constraint for the deep part of the 79 • N section assuming that the sill is at its shallowest between the sections.…”

Section: Methodsmentioning

confidence: 99%

Recirculation in the Fram Strait and transports of water in and north of the Fram Strait derived from CTD data

et al. 2013

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Abstract. The volume, heat and freshwater transports in the Fram Strait are estimated from geostrophic computations based on summer hydrographic data from 1984, 1997, 2002 and 2004. In these years, in addition to the usually sampled section along 79 • N, a section between Greenland and Svalbard was sampled further north. Quasi-closed boxes bounded by the two sections and Greenland and Svalbard can then be formed. Applying conservation constraints on these boxes provides barotropic reference velocities. The net volume flux is southward and varies between 2 and 4 Sv. The recirculation of Atlantic water is about 2 Sv. Heat is lost to the atmosphere and the heat loss from the area between the sections averaged over the four years is about 10 TW. The net heat (temperature) transport is 20 TW northward into the Arctic Ocean, with large interannual differences. The mean net freshwater added between the sections is 40 mSv and the mean freshwater transport southward across 79 • N is less than 60 mSv, indicating that most of the liquid freshwater leaving the Arctic Ocean through Fram Strait in summer is derived from sea ice melt in the northern vicinity of the strait.In 1997

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“…The depth of about 2700 m (2744 dbar) is used to block the deeper waters in the northern section from crossing the strait. However, the sill depth is cited as 2600 m in literature and studies of the bottom bathymetry in the Fram Strait show a very complex structure (e.g., Klenke and Schenke, 2002). We have on the 79 • N sections 1-7 stations that reach deeper than 2600 m. Should we use that as a limiting depth, we would need an extra constraint for the deep part of the 79 • N section assuming that the sill is at its shallowest between the sections.…”

Section: Methodsmentioning

confidence: 99%

Recirculation in the Fram Strait and transports of water in and north of the Fram Strait derived from CTD data

Marnela¹,

Rudels²,

Houssais³

et al. 2012

Preprint

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The volume, heat and freshwater transports in the Fram Strait are estimated from geostrophic computations based on summer hydrographical data from 1984, 1997, 2002 and 2004. In these years, in addition to the usually sampled section along 79° N, a section between Greenland and Svalbard was sampled further north. Quasi-closed boxes bounded by the two sections and Greenland and Svalbard can then be formed and conservation constraints applied on the boxes. The net volume flux is southward and varies between 2 and 4 Sv. The recirculation of Atlantic water is about 2 Sv. Heat is lost to the atmosphere and the heat loss averaged for the four boxes is about 10 TW and the net heat (temperature) transport is 20 TW northward into the Arctic Ocean, with large interannual differences. The mean net freshwater added between the sections is 40 mSv and the mean freshwater transport southward across 79° N is less than 60 mSv, indicating that most of the liquid freshwater leaving the Arctic Ocean through Fram Strait in summer derives from sea ice melt in the northern vicinity of the strait. <br><br> In 1997, 2001 and 2003 meridional sections along 0° longitude were sampled and in 2003 two smaller boxes can be formed, and the recirculation of Atlantic water in the strait is estimated by geostrophic computations and continuity constraints. The recirculation is weaker close to 80° N than close to 78° N, indicating that the recirculation is mainly confined to south of 80° N. This is supported by the observations in 1997 and 2001, when only the northern part of the meridional section, from 79° N to 80° N, can be computed with the constraints applied. The recirculation is found strongest close to 79° N

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Cited by 46 publications

References 12 publications

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

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

Recirculation in the Fram Strait and transports of water in and north of the Fram Strait derived from CTD data

Recirculation in the Fram Strait and transports of water in and north of the Fram Strait derived from CTD data

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