The 1918 Vancouver Island earthquake occurred in British Columbia, Canada at 12:41 a.m. Pacific Standard Time on December 6.[1] The earthquake was most likely of the strike-slip type, and was estimated to have a maximum perceived intensity of VII (Very strong) on the Mercalli intensity scale. The epicenter was located east of the Stewardson inlet on the west coast of Vancouver Island, with damage occurring at the Estevan Point lighthouse on the Hesquiat Peninsula.[2] The event registered 7.2 on the moment magnitude scale and was felt as far as northern Washington state and the interior of British Columbia.
  Vancouver  | |
| UTC time | 1918-12-06 08:41:07 |
|---|---|
| ISC event | 913365 |
| USGS-ANSS | ComCat |
| Local date | December 6, 1918 |
| Local time | 12:41 a.m. PST |
| Magnitude | 7.2 Mw[1] |
| Depth | 30 kilometers (19 mi) |
| Epicenter | 49°26′N 126°13′W / 49.44°N 126.22°W |
| Type | Strike-slip |
| Areas affected | British Columbia Canada |
| Max. intensity | MMI VII (Very strong) |
The earthquake took place in the vicinity of the Cascadia subduction zone where the Juan de Fuca plate and the Explorer plate are being subducted under the North American plate at a rate of 4 centimeters (1.6 in) and less than 2 centimeters (0.79 in) per year respectively, but the event was a crustal intraplate earthquake and was produced from the complicated interaction between the plates in the area. The source of the earthquake was the Nootka transform fault, which separates the Juan de Fuca and Explorer plates and has been the origin of at least five additional moderate to large events since 1918.[3]
See also
editReferences
edit- ^ a b "The M7 Vancouver Island Earthquake of December 6, 1918". Natural Resources Canada. Retrieved March 12, 2012.
- ^ Cassidy, Ellis & Rogers 1988, p. 626
- ^ Cassidy, Ellis & Rogers 1988, p. 617
- Bibliography
- Cassidy, John F.; Ellis, Robert M.; Rogers, Garry C. (April 1988), "The 1918 and 1957 Vancouver Island earthquakes", Bulletin of the Seismological Society of America, 78 (2), Seismological Society of America: 617–635
External links
edit- The International Seismological Centre has a bibliography and/or authoritative data for this event.