Crustal structure beneath the Faroe Islands and the Faroe–Iceland Ridge

Richardson, K. M.; Smallwood, John R.; White, R. S.; Snyder, David B.; Maguire, P. K. H.

doi:10.1016/s0040-1951(98)00239-x

Cited by 95 publications

(106 citation statements)

References 41 publications

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“…Based on their seismic data, Richardson et al (1998) discuss two alternative models of which the first one would meet the velocity-depth distribution found along our line quite well. However, the model they favor cannot explain any of our traveltime sections, especially the strong P m P reflections generated by a velocity contrast of about 0.9 km/s at the Moho at 23 km depth below the crest of the ridge were both lines intersect.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 78%

“…In the 1990, a large-scale seismic refraction experiment, the so-called FIRE line, was carried out extending from Iceland to the Faeroe Islands along the entire IFR and resulted in a velocity model down to 55 km depth (Richardson et al, 1998;Smallwood et al, 1999). Based on their seismic data, Richardson et al (1998) discuss two alternative models of which the first one would meet the velocity-depth distribution found along our line quite well.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 88%

“…In contrast, a number of authors (e.g. Bott et al, 1971;Fleischer, 1971;Bott and Gunnarsson, 1985;Richardson et al;, Smallwood et al, 1999 proposed a crust of oceanic origin of this structure with a thickness between 20 and 35 km formed between 55 and 40 million years b.p. by volcanic activity in association to a hot spot.…”

Section: Introduction and Tectonic Settingmentioning

confidence: 94%

“…However, the model they favor cannot explain any of our traveltime sections, especially the strong P m P reflections generated by a velocity contrast of about 0.9 km/s at the Moho at 23 km depth below the crest of the ridge were both lines intersect. Furthermore, Richardson et al (1998) state to have mapped the transition from continental Faeroe to thickened oceanic crust of the Faeroe-Iceland Ridge 100 to 40 km NW of the Faeroe Islands based on lateral variation of v p in the upper crust. The IFR itself was interpreted to be composed of >30 km thick oceanic crust based on seismic and gravity modeling.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

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Crustal structure of the southeastern Iceland-Faeroe Ridge (IFR) from wide aperture seismic data

Bohnhoff¹,

Makris²

2004

Journal of Geodynamics

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The aseismic Iceland-Faeroe-Ridge (IFR) is of central importance in reconstructing the opening of the North Atlantic Ocean. To investigate the crustal structure of the IFR at its southeastern part we conducted a wide aperture seismic survey across the IFR from the Iceland Basin to the Norway Basin. Seismic energy was generated by two 60-litre sleeve guns and recorded by 42 ocean-bottom seismometers (OBS). Kinematic and dynamic forward modeling by two-point ray tracing was applied to develop a 2D velocity-depth model. The accuracy of the model obtained is better than 5% for both velocity and depth of interfaces. We find a Moho depth of 23 km below the crest of the ridge that decreases to about 15 km at either end of the line. The upper part of the crust exhibits P-wave velocities between 5.7 and 6.3 km/s that increase towards the Norway Basin. The lower crust is more homogeneous with v p ranging from 6.6 to 7.0 km/s. Upper and lower parts of the crust are separated by a first order discontinuity. Amplitudes (P m P) and arrival times (P n ) of wide-angle phases indicate upper-mantle velocities of 7.9 km/s. Furthermore we analyzed PS-converted phases for upper crustal depth levels and find a v p /v s ratio of 1.73 AE 0.04 equal to a Poisson's ratio of 0.25 with no significant lateral variations along the seismic line. On the crest of the ridge we identified a basalt layer embedded within the sedimentary sequence that was also penetrated by deep sea drilling and dated to 43AE 3.3 million years. Below the basalt layer we observed a low-velocity layer that is identified as Mesozoic sediment that was also observed to either end of the basalt. We conclude that the southeastern part of the IFR is composed of stretched continental crust and thus part of Paleo-Europe rather than oceanic crust formed by the Iceland hot spot. This conclusion is supported by the distribution of magnetic anomalies that allow identifying the passive continental margin approximately 100 km to the NW of our seismic line. #

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Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 78%

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 88%

Section: Introduction and Tectonic Settingmentioning

confidence: 94%

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

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Crustal structure of the southeastern Iceland-Faeroe Ridge (IFR) from wide aperture seismic data

Bohnhoff¹,

Makris²

2004

Journal of Geodynamics

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“…Two lines were completely removed from the Moho dataset. The first line is the IFR profile (Bohnhoff & Makris 2004) across the Iceland -Faroe Ridge, which has a substantially lower Moho depth (23 km) than the FIRE offshore line (Richardson et al 1998) along the ridge (.30 km) (Fig. 4).…”

Section: Compilationmentioning

confidence: 99%

Moho and basement depth in the NE Atlantic Ocean based on seismic refraction data and receiver functions

Funck

Geissler

Kimbell

et al. 2016

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Seismic refraction data and results from receiver functions were used to compile the depth to the basement and Moho in the NE Atlantic Ocean. For interpolation between the unevenly spaced data points, the kriging technique was used. Free-air gravity data were used as constraints in the kriging process for the basement. That way, structures with little or no seismic coverage are still presented on the basement map, in particular the basins off East Greenland. The rift basins off NW Europe are mapped as a continuous zone with basement depths of between 5 and 15 km. Maximum basement depths off NE Greenland are 8 km, but these are probably underestimated. Plate reconstructions for Chron C24 (c. 54 Ma) suggest that the poorly known Ammassalik Basin off SE Greenland may correlate with the northern termination of the Hatton Basin at the conjugate margin. The most prominent feature on the Moho map is the Greenland-Iceland-Faroe Ridge, with Moho depths .28 km. Crustal thickness is compiled from the Moho and basement depths. The oceanic crust displays an increased thickness close to the volcanic margins affected by the Iceland plume.Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.

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Seismic Imaging of Lower Crustal Heterogeneity

Hobbs

2003

Heterogeneity in the Crust and Upper Mantle

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Crustal structure beneath the Faroe Islands and the Faroe–Iceland Ridge

Cited by 95 publications

References 41 publications

Crustal structure of the southeastern Iceland-Faeroe Ridge (IFR) from wide aperture seismic data

Crustal structure of the southeastern Iceland-Faeroe Ridge (IFR) from wide aperture seismic data

Moho and basement depth in the NE Atlantic Ocean based on seismic refraction data and receiver functions

Seismic Imaging of Lower Crustal Heterogeneity

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