While small earthquakes often occur along the West Coast of North America, the region has been particularly seismically active over the past two days.
Yesterday (July 3), several earthquakes of varying intensity took place off the British Columbian coastline, as well as quakes in California and near Alaska and Oregon.
North of Haida Gwaii
At 3:36 a.m. on July 3, a 3.9-magnitude quake hit north of Haida Gwaii and south of Prince of Wales Island, Alaska (as previously reported).
After that one, a 2.7-magnitude quake occurred on Vancouver Island’s west coast at 12:31 p.m. on July 3, according to the U.S. Geological Survey.
The epicentre, at a depth of 5 kilometres (3 miles), was 25 kilometres (16 miles) south of Tofino, 92 kilometres (57 miles) southwest of Port Alberni, and 200 kilometres (124 miles) west of Victoria.
Two earthquakes took place offshore from Oregon on the afternoon of July 3.
A 4.1-magnitude quake occurred at 3:32 p.m. and was followed by a 3.7-magnitude quake at 3:42 p.m.
The epicentre of the first quake was located 385 kilometres (239 miles) west of Yachats, Oregon, and 470 kilometres (292 miles) west of Salem, Oregon, at a depth of 10 kilometres (6 miles), while the epicentre of the second quake was about 12 kilometres (7 miles) closer to shore.
South of Haida Gwaii
Following those, at around 9:30 p.m., a strong quake hit near Queen Charlotte Sound, south of Haida Gwaii and north of Vancouver Island, as previously reported.
However, while the U.S. Geological Survey recorded it as a 6.2-magnitude event, Earthquakes Canada initially measured it as 5.6-magnitude before later reassessing it as 5.8-magnitude.
Earthquakes Canada also reported another quake that followed in the same area at 10:55 p.m., measuring 4.0-magnitude.
North of Haida Gwaii
Today (July 4), another quake hit north of Haida Gwaii at 3:51 a.m.
The U.S. Geological Survey initially measured it as a 4.8-magnitude quake, but later downgraded it to a 4.3-magnitude event.
The epicentre was near the surface at 5 kilometres (3 miles) and was located 123 kilometres (76 miles) southwest of Craig, Alaska, and 329 kilometres (204 miles) west of Prince Rupert (see main picture).
Meanwhile, a strong inland quake shook California at 10:33 a.m. today (July 4).
This earthquake was initially measured as a 6.6-magnitude quake, and has been reassessed as a 6.4-magnitude tremblor by the U.S. Geological Survey.
The epicentre was listed at a shallow depth of 8 kilometres (5 miles) and was located 12 kilometres southwest of Searles Valley, 179 kilometres (109 miles) north of San Bernadino, and 196 kilometres (122 miles) northeast of Los Angeles.
According to CNN, the earthquake was felt in Los Angeles as buildings swayed and there have been some reports of damage, including cracks in buildings, broken water mains, rock slides, and fires.
The quake was followed by at least four aftershocks, ranging from 3.5- to 4.7-magnitude, as well as smaller seismic activity.