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TitleSeismicity in the Labrador-Baffin Seaway and surrounding onshore regions
Associated Data
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBent, A L; Voss, P
SourceGeological synthesis of Baffin Island (Nunavut) and the Labrador-Baffin Seaway; by Dafoe, L TORCID logo (ed.); Bingham-Koslowski, NORCID logo (ed.); Geological Survey of Canada, Bulletin 608, 2022 p. 379-387, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
RelatedThis publication is contained in Geological synthesis of Baffin Island (Nunavut) and the Labrador-Baffin Seaway
File formatpdf; html; xlsx
ProvinceNunavut; Newfoundland and Labrador; Northern offshore region
NTS3; 14; 15; 16; 23I; 23O; 23P; 25A; 25G; 25H; 25I; 25J; 25K; 25L; 25M; 25N; 25O; 25P; 26; 27; 28; 29A; 29B; 29C; 29D; 35P; 36A; 36B; 36C; 36D; 36E; 36F; 36G; 36H; 36I; 36P; 37; 38; 39A; 39B; 39C; 39D; 47E; 47F; 47G; 47H; 48A; 48B; 48C; 48D; 48E; 57E; 57H; 58A; 58D
AreaBaffin Island; Baffin Bay; Bylot Island; Davis Strait; Labrador; Labrador Sea; Canada; Greenland; Denmark
Lat/Long WENS -90.5000 -43.0000 78.0000 52.0000
Subjectsgeophysics; structural geology; tectonics; Science and Technology; Nature and Environment; Health and Safety; seismology; seismicity; seismic risk; earthquakes; earthquake risk; earthquake magnitudes; bedrock geology; structural features; faults; faults, thrust; faults, strike-slip; faults, normal; stress orientation; epicentres; glacial history; isostasy; modelling; seismological network; seismographs; fault plane solutions; Canadian National Earthquake Database; Canadian National Seismograph Network
Illustrationslocation maps; geoscientific sketch maps; tables
ProgramGEM2: Geo-mapping for Energy and Minerals Baffin Region Atlas
Released2022 08 15
AbstractStudying earthquakes in Baffin Bay and the surrounding regions is challenging. There is no knowledge of earthquake activity in this region prior to 1933 when a moment magnitude (MW) 7.4 earthquake occurred in Baffin Bay. With improved instrumentation, increased seismograph coverage in the north, and modern analysis techniques, knowledge and understanding of earthquakes in the Baffin region is improving. Active seismic zones include Baffin Bay, the east coast of Baffin Island, and the Labrador Sea, separated by areas of low seismicity. Focal-mechanism solutions show a mix of faulting styles, predominantly strike-slip and thrust. Regional stress-axes orientations show more consistency, which suggests that activity is occurring on previously existing structures in response to the current stress field. There is little correlation between earthquake epicentres in Baffin Bay and mapped structures. Glacial isostatic adjustment may be a triggering mechanism for earthquakes in the Baffin region, but modelling efforts have yielded equivocal results.
Summary(Plain Language Summary, not published)
This paper is part of a comprehensive volume on the Baffin region. It is focused on earthquakes. Topics covered include earthquake monitoring, regions of high seismic activity in the Baffin-Labrador Seaway and focal mechanisms (style of faulting) for the largest earthquakes. Earthquakes as large as magnitude 7.4 have occurred in Baffin Bay. In much of this region there is not a clear correlation between earthquake epicenters and mapped faults. Processes, such as glacial isostatic adjustment, which may play a role in the generation of earthquakes in this region are also discussed.

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