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TitleAn overview of the 28 October 2012 Mw 7.7 earthquake in Haida Gwaii, Canada: a tsunamigenic thrust event along a predominantly strike-slip margin
AuthorCassidy, J F; Rogers, G C; Hyndman, R D
SourcePure and Applied Geophysics 2014 p. 1-9,
Alt SeriesEarth Sciences Sector, Contribution Series 20130320
Mediaon-line; digital
File formatpdf
ProvinceBritish Columbia; Western offshore region
NTS103B; 103C; 103F; 103G/13; 103J/04; 103K/01; 103K/02; 103K/03
AreaHaida Gwaii
Lat/Long WENS-134.0000 -130.2500 54.2500 51.5000
Subjectstectonics; geophysics; tectonic setting; tectonic environments; seismicity; earthquakes; earthquake studies; earthquake magnitudes; earthquake mechanisms; tsunami; Cascadia subduction zone; Queen Charlotte Fault
Illustrationslocation maps
ProgramAssessing Earthquake Geohazards, Public Safety Geoscience
AbstractThe boundary between the Pacific and North America plates along Canada's west coast is one of the most seismically active regions of Canada, and is where Canada's two largest instrumentally recorded earthquakes have occurred. Although this is a predominantly strike-slip transform fault boundary, there is a component of oblique convergence between the Pacific and North America plates off Haida Gwaii. The 2012 Mw 7.7 Haida Gwaii earthquake was a thrust event that generated a tsunami with significant run up of over 7 m in several inlets on the west coast of Moresby Island (several over 6 m, with a maximum of 13 m). Damage from this earthquake and tsunami was minor due to the lack of population and vulnerable structures on this coast.
Summary(Plain Language Summary, not published)
The magnitude 7.7 earthquake of October 27, 2012 was the largest thrust earthquake ever recorded along this mainly strike slip margin to the west of Haida Gwaii on the coast of British Columbia. Movement along the fault extended more than 100-km's along the coast and extended about 50 km offshore and a significant tsunami was generated. This article is an invited contribution for a special tsunami volume (on tsunami¿s of 2012) and provides an overview of earthquakes and tectonics of the Haida Gwaii region, and a summary of the October 27, 2012 M 7.7 earthquake.