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TitleCruise report 2012005PGC, the Mw 7.7 Haida Gwaii Earthquake ocean bottom seismometer experiment instrument deployment, gas-plume acoustic imaging, and water sampling, CCG Vessel John P. Tully, 7-11 December, 2012
AuthorRiedel, M; Côté, M M; Neelands, P J
SourceGeological Survey of Canada, Open File 7555, 2014, 36 pages, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediadigital; on-line
RelatedThis publication is related to Riedel, M; Côté, M M; Neelands, P J; (2014). Cruise report 2013001PGC, the Mw 7.7 Haida Gwaii Earthquake ocean bottom seismometer experiment instrument recovery and active-source seismic refraction experiment, CCG Vessel John P. Tully, 7-14 January, 2013, Geological Survey of Canada, Open File 7556
File formatpdf
ProvinceWestern offshore region
AreaHaida Gwaii; Pacific Ocean
Lat/Long WENS-132.8333 -131.5833 52.8833 52.1167
Subjectsgeophysics; geophysical surveys; earthquakes; earthquake studies; earthquake magnitudes; epicentres; aftershocks; seismic interpretations; seismicity; seismographs; seismological network; seismology; seismic waves; gas; gas bubbles; acoustic surveys; acoustic surveys, marine; water analyses
Illustrationslocation maps; tables; photographs; profiles; logs
ProgramPublic Safety Geoscience, Assessing Earthquake Geohazards
Released2014 05 13
Summary(Plain Language Summary, not published)
This Geological Survey of Canada Openfile summarizes the activities undertaken during the deployment phase of the Haida Gwaii Earthquake Ocean Bottom Seismometer Experiment, 7-11 December, 2012. Canada¿s second largest instrumentally recorded earthquake occurred at 8:05 p.m. on October 27th, 2012, off the west coast of Moresby Island, Haida Gwaii, British Columbia. In the first month after the earthquake more than 20,000 aftershocks were recorded. Most of these aftershocks were less than magnitude 2. The initial locations of aftershocks from this earthquake cover an area 150 km long extending westward from beneath Moresby Island to more than 50 km offshore. This aftershock zone is the target of the Ocean Bottom Seismometer (OBS) experiment where 14 instruments were deployed for a one month period to help to improve in determining the location of additional aftershocks. The data will also help improve the historic earthquake catalogue for this region.