The seismicity and seismotectonics of eastern Canada

Adams, John; Basham, P. W.

doi:10.1130/dnag-csms-neo.261

Cited by 87 publications

(146 citation statements)

References 57 publications

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“…11). Its presence further supports the hypothesis of Basham (1989, 1991) and Basham and Adams (1989) that this rift system extends into Lake Ontario.…”

Section: Southeastern Lake Ontariosupporting

confidence: 60%

“…This fault is parallel to, and just north of, the northern limit of the proposed extension of the St. Lawrence rift (Fig. 11), as illustrated by Adams and Basham (1989;1991) and Basham and Adams (1989). The Hamilton-Presqu-ile may, therefore, either represent the geophysical expression of the northern boundary of the rift extension, or it may be one of a series of faults within a much wider rift zone than previously envisaged.…”

Section: Southeastern Lake Ontariomentioning

confidence: 93%

“…Extension of the St. Lawrence rift system (Kumarapeli and Saull, 1966) southwesterly into Lake Ontario and beyond was postulated by Basham (1989, 1991), and Basham and Adams (1989). The St. Lawrence rift system comprises a set of faults which lie within, and most likely are responsible for, the St. Lawrence, Saguenay and Ottawa River Valleys.…”

Section: Southeastern Lake Ontariomentioning

confidence: 99%

“…There is no documented evidence of any earthquakes of M 2*5 in southern Ontario, although there were two such events in adjacent western New York State, the 1857, M~5 Lockport and the 1929, m b = 5.2 Attica earthquakes. Adams and Basham (1989;1991 ), and Basham and Adams (1989), in following up on an idea initially proposed by Kumarapeli and Saull (1966), postulated that the seismically active St. Lawrence rift system extends upstream along the St. Lawrence River, through the lower Great Lakes (Ontario and Erie), towards New Madrid, Missouri. Because of the occurrence of seismic events of M«=7 along this structure, the implication of their suggestion is that southern Ontario could conceivably be the site of a future, similar-sized earthquake.…”

Section: Introductionmentioning

confidence: 99%

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Recent Deformation in the Bottom Sediments of Western and Southeastern Lake Ontario and its Association with Major Structures and Seismicity

Thomas¹,

Wallach²,

McMillan³

et al. 2007

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“…11). Its presence further supports the hypothesis of Basham (1989, 1991) and Basham and Adams (1989) that this rift system extends into Lake Ontario.…”

Section: Southeastern Lake Ontariosupporting

confidence: 60%

Section: Southeastern Lake Ontariomentioning

confidence: 93%

Section: Southeastern Lake Ontariomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Recent Deformation in the Bottom Sediments of Western and Southeastern Lake Ontario and its Association with Major Structures and Seismicity

Thomas¹,

Wallach²,

McMillan³

et al. 2007

gpq

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“…SCCs are far removed from plate boundaries, including passive margins, and contain no embedded rift structures. From experience in eastern Canada (Adams and Basham, 1991), and around the world (Johnston et al, 1994), it is clear that regions of rifted crust embedded within the continents are significantly more seismically active than adjoining unrifted regions. Rifts of Precambrian age, however, show seismic activity no higher than unrifted crust, and are assumed to be 'healed'.…”

Section: Seismotectonic Characteristics Of Scc Regionsmentioning

confidence: 99%

Seismic Hazards Assessment for Radioactive Waste Disposal Sites in Regions of Low Seismic Activity

2006

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Abstract. A comparative tectonic quiescence and lack of earthquakes make the stable centres of continents attractive for siting long-term radioactive waste storage facilities. The low rates of deformation in such regions, however, make it difficult to characterize their long-term seismotectonic behaviour, leading to uncertain estimates for the very low probability hazard estimates required by society. In an attempt to overcome the deficiency of both contemporary seismicity and paleoseismic data in central Canada, we have used earthquake histories from regions with similar seismotectonic characteristics from around the world. Substituting space for time, we estimate a long-term rate per 10 6 km 2 of 0.004 magnitude ‡6 earthquakes per annum, of which 33-100% might rupture to the surface.

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Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, Labrador)

Trottier

Lajeunesse

Gagnon-Poiré

et al. 2020

Earth Surf Processes Landf

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High‐resolution multibeam bathymetric data and acoustic sub‐bottom profiles were recently collected in Grand Lake (Labrador), one of the deepest lake basins in eastern North America, to reconstruct: (1) the retreat of the Laurentide Ice Sheet (LIS) west of Lake Melville and (2) the history of sedimentation since deglaciation in this 54 km‐long, 3 km‐wide fjord‐lake. Our results provide a morphostratigraphical framework that brings new insights to the style and pattern of retreat of the LIS in the region, as well as deglacial and postglacial sedimentary dynamics. Terrestrial glacial lineations observed on a digital elevation model (DEM) provide evidence of a previously undocumented ice stream in the Grand Lake area. This newly mapped ice stream suggests that the calving bay formed in Lake Melville triggered a reorganization of the regional drainage pattern of the LIS. The sedimentary infill of Grand Lake consists of a sequence of deglacial to postglacial sediments that contain deposits related to a series of mass movements. The 8.2 cal ka BP cold event is recorded in Grand Lake by a series of closely spaced moraines deposited at the outlet of the fjord‐lake to form a morainic complex similar to the Cockburn morainic complex on Baffin Island. During deglaciation, a dense dendritic network of proglacial gullies incised into the steep sidewalls of the lake. Since deglaciation, paraglacial and postglacial sedimentation has led to the deposition of large prograding deltas at the fjord head, where density currents remain active today and have formed a series of sediment waves on the frontal slopes and a prodeltaic environment. © 2019 John Wiley & Sons, Ltd.

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The seismicity and seismotectonics of eastern Canada

Cited by 87 publications

References 57 publications

Recent Deformation in the Bottom Sediments of Western and Southeastern Lake Ontario and its Association with Major Structures and Seismicity

Recent Deformation in the Bottom Sediments of Western and Southeastern Lake Ontario and its Association with Major Structures and Seismicity

Seismic Hazards Assessment for Radioactive Waste Disposal Sites in Regions of Low Seismic Activity

Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, Labrador)

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