Neotectonics seismicity in the south-eastern Beaufort Sea polar continental margin of north-western Canada

Stephenson, Randell; Smolyaninova, E.I.

doi:10.1016/s0264-3707(97)00084-7

Cited by 7 publications

(5 citation statements)

References 45 publications

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“…Forsyth et al, 1990).The first was interpreted by Forsyth et al (1990) as active tectonic adjustment along margin structures related to rapid sediment loading effects, whereas Stephenson and Smolyaninova (1999) postulated a localised tectonic mechanism associated with dynamic processes intrinsic to the lithosphere-asthenosphere boundary geometry along a rifted margin coupled with post-glacial rebound effects. The gravity, magnetic and seismicity characteristics of this segment of the CAM are similar to those of many known rifted passive continental margins in different regions of the world (e.g.…”

Section: Regional Setting and Character Of Potential Field Anomalies mentioning

confidence: 99%

Geological features of the northeastern Canadian Arctic margin revealed from analysis of potential field data

et al. 2016

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Section: Regional Setting and Character Of Potential Field Anomalies mentioning

confidence: 99%

Geological features of the northeastern Canadian Arctic margin revealed from analysis of potential field data

et al. 2016

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“…Though rifted continental margins tend to play a minor role in the occurrence of these processes, neotectonic activity has been observed in several rifted type continental margins in the world: the West Africa margin (Morley and Guerin, 1996), the South China Sea (Lüdmann and Wong, 1999), the Beaufort Sea (Stephenson and Smolyaninova, 1998), the Hatton-Rockall Margin (Hitchen, 2004), the Central Norway Margin (Bungum et al, 2005), and the West Greenland margin (Japsen et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Cenozoic deformational structures on the Galicia Bank Region (NW Iberian continental margin)

et al. 2008

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“…Similarly, crystalline basement blocks at marginal highs will induce tensional stresses within the high and compressive stresses on either side. On the basis of data and models from the Beaufort-Mackenzie Basin,Stephenson and Smolyaninova [1999] find a more local tectonic mechanism related to the lithosphere-asthenosphere transition to be favored, predicting a localized zone of uplift, with maximumshear stresses (-30 MPa), in an area of well-defined seismicity. Flexural stresses include glacial loading and unloading, with potential dramatic effects during and following deglaciation [Bungum and Lindholm, 1997], whereas their residual eft•cts at present (~10 MPa?)…”

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confidence: 99%

Seismotectonics of the Norwegian continental margin

Byrkjeland¹,

Bungum²,

Eldholm³

2000

J. Geophys. Res.

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Abstract. The Norwegian continental margin and surrounding areas are seismically less active than some other passive margins worldwide, indicating a potential earthquake deficit. The adjacent oceanic crust is mostly aseismic except for parts of the Lofoten and Norway Basins which have experienced rapid deposition of glacial sediments. The excess load has enhanced the local stress field and, in turn, the seismic activity. The marginal highs along the continent-ocean transition and the part of the MOre and V0ring Basins which experienced crustal extension prior to the early Tertiary breakup are practically aseismic. This region is also underlain by high-velocity lower crust emplaced during breakup, suggesting crustal strengthening, which also may increase the return periods for the largest events. Farther landward, a spatial correlation of seismic activity and the glacial sediment wedge suggests a causal relationship, expressed through preferential rejuvenation of Late Jurassic-Early Cretaceous faults. The locally high seismic activity in the coastal region occurs in areas where the continental crust is relatively thick (25-30 km) but still thinner than in the shield area farther east (45-50 km). Although stress relations are complex, we suggest that increased stress due to appreciable postglacial rebound gradients in the coastal region may be a contributing factor. While the stress field along the margin complies in general with the ridge push force, we infer that regional and local stress enhancement factors are not only present in this region but also necessary for explaining the earthquake activity. The relative importance of local stress sources is supported by several cases of 90 ø stress rotations relative to the ridge push direction. The superposition of regional and local stress, together with the existence of weakness zones and faults, yields potentials for earthquakes, primarily through structural reactivation.

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Neotectonics seismicity in the south-eastern Beaufort Sea polar continental margin of north-western Canada

Cited by 7 publications

References 45 publications

Geological features of the northeastern Canadian Arctic margin revealed from analysis of potential field data

Geological features of the northeastern Canadian Arctic margin revealed from analysis of potential field data

Cenozoic deformational structures on the Galicia Bank Region (NW Iberian continental margin)

Seismotectonics of the Norwegian continental margin

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