July 22 - The ETS event predicted for spring/summer 2004 continues. Tremor began on July 8 and slip has been confirmed by GPS observations. The event started beneath the northern Olympic Peninsula in Washington State and has now migrated northwest to the region of Cowichan Lake on Vancouver Island.
July 22 - update: Aftershocks continue - but are becoming much smaller and less frequent.
July 19 1:01am PDT (08:01UT): A M=6.4 earthquake occurred off the west coast of Vancouver Island, 40 km to the southwest of Nootka Island. It was felt at communities across Vancouver Island, including Port Alice, Port McNeill, Alert Bay, Campbell River, Courtenay, Comox, Duncan, Nanaimo, and Victoria. On the BC mainland, it was felt at Whistler, the Sunshine Coast (Gibsons, Sechelt and Powell River) and across Greater Vancouver. Other than some items being knocked from shelves, there have been no reports of damage.
July 16 12:27pm PDT (19:27UT): A magnitude 4.5 earthquake occurred 97 km NW of Dawson City, Yukon. It was felt in Dawson City. Click here for map.
July 15 05:06am PDT (12:06UT): A magnitude 5.8 earthquake occurred 40 km west off Nootka Island, just off the west coast of Vancouver Island. It was felt by residents on northern and central Vancouver Island, the Sunshine Coast and by a few in greater Vancouver and the Lower Mainland. The largest aftershock was M=3.6 at 06:55 PDT July 15. No damage has been reported. Click here for map.
June 28, 02:49 PDT (09:49UT): A magnitude 6.8 earthquake off southeast Alaska, just north of the Queen Charlotte Islands, was felt on the Queen Charlotte Islands, southeast Alaska and in northern BC.
Episodic tremor and slip is a new phenomenon discovered in the Cascadia subduction zone beneath Vancouver Island by scientists with the Geological Survey of Canada (GSC) . It consists of repeated slow slip events on the lower portion of the subduction fault, accompanied by unique non-earthquake tremor-like seismic signals that emanate from the same region.
Large subduction earthquakes of magnitude about 9 have occurred on the Cascadia subduction zone beneath the west coast of Canada and the United States on average every 500 years or so, but with considerable variability in repeat times. The last one was on January 26, 1700.
All along this margin, continuous Global Position System (GPS) installations show a slow landward movement towards the northeast, demonstrating long term stress accumulation leading up to the next great Cascadia earthquake.
A team of scientists at (GSC) has discovered that GPS sites in the southern Vancouver Island region occasionally reverse their motion, moving seaward for periods of about two weeks before resuming their longer-term landward motion.
Magnitude 2.9 - OREGON 2004 July 23 20:06:27 UTC
Magnitude 2.7 - OREGON 2004 July 23 08:43:57 UTC
Magnitude 2.6 - OREGON 2004 July 23 04:46:14 UTC
Magnitude 2.5 - OREGON 2004 July 23 00:25:49 UTC
Magnitude 4.3 - OREGON 2004 July 22 20:26:27 UTC