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TitleJanuary 2008 Revere-Dellwood Fault earthquake sequence offshore British Columbia
AuthorBird, A L; Rogers, G C; Cassidy, J F; Kao, H; Dragert, H; Bentkowski, W
SourceSeismological Research Letters vol. 79, no. 2, 2008 p. 295
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20080028
MeetingSeismological Society of America Annual Meeting; Santa Fe, New Mexico; US; April 16-18, 2008
Mediapaper; on-line; digital
ProvinceWestern offshore region
Subjectsgeophysics; earthquakes; earthquake risk; earthquake studies; earthquake magnitudes; seismic risk; structural features; faults; Revere-Dellwood Fault
ProgramCanadian Hazard Information Service
AbstractStarting on 5 January 2008, a sequence of strong earthquakes occurred along the seismically active Revere-Dellwood Fault which is located seaward of the continental shelf, between the southern tip of the Queen Charlotte Islands and the northern tip of Vancouver Island. The two largest earthquakes in the sequence, Mw 6.4 and Mw 6.6, occurred at 3:01 and 3:44 a.m. on 5 January and were felt mildly at some communities on the Queen Charlotte Islands, Vancouver Island and the mainland of British Columbia. The Revere-Dellwood is a transform fault about 100 km long in very young lithosphere connecting the Tuzo Wilson spreading centre to the Explorer spreading ridge, and is part of the complicated triple junction region at the northern end of the Cascadia subduction zone. Like the Queen Charlotte Fault and California's San Andreas Fault, it is interpreted that relative Pacific - North America motion takes place along this feature; preferred focal mechanisms indicate mainly right-lateral strike-slip motion. A similar sequence of earthquakes in April 1992 ruptured most of the southern half of the Revere-Dellwood Fault. This year's events are distributed mainly along the northern half of the fault and in the region of the Tuzo Wilson spreading centre. Each of these sequences released about 20 years of accumulated strain.