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TitleA seismic survey in the vicinity of Vancouver Island, British Columbia
AuthorMilne, W G; White, W R H
SourcePublications of the Dominion Observatory vol. 24, no. 7, 1960, 10 pages, (Open Access)
MapsPublication contains 1 map
Map Info.geophysical, seismic
Mediapaper; on-line; digital
File formatpdf
ProvinceAlberta; British Columbia
NTS92B; 92C; 92E; 92F
AreaVancouver Island
Subjectsgeophysics; regional geology; seismic interpretations; seismic velocities; seismic surveys; Bear Creek Fault; Leech River Fault; Ripple Rock B+salts
Released1960 01 01; 2018 11 19
Abstractln cooperation with the Royal Canadian Navy and the Pacifie Naval Laboratory, a eeriee of precisely timed depth chargea were detonated in eelected areas adjacent to Vancouver Island, British Columbia. From the seismic travel-time curves considerable information was obtained about crustal layera in this region. A granitic rock with a velocity of 6.3 km/eec apparently forme the basement rock for the area. South of Victoria this is covered by a volcanic rock with veloc!ty 5.4 km/sec, and it was possible to obtain measurements of depthe, and of the dip of the bottom interface of this bed. Under the Strait of Georgia travel-time curves indicated a coneiderable thicknees of low-velocity material. Near the site of the Ripple Rock explosion another, lower velocity, volcanic rock reste on the granitic basement. Surface velocities have been measured in all these areas ueing portable refraction equipment.