Updated with Natural Resources Canada’s revision of earthquake epicentre.
A minor earthquake — registering 4.0 on the Richter scale — added a little rumble to the Osoyoos morning.
The tremor, with an epicentre just east of Oliver, occurred about 9:16. According to Natural Resources Canada, it was likely felt throughout the South Okanagan and West Boundary region of the province.
The epicentre was initially recorded as being at 49.5 W, 119.37 N. — which would have placed it east of Penticton — but was later revised to the location near Mt. Baldy.
There are no reports of damage.
“Magnitude is a measure of the amount of energy released during an earthquake,” according to Natural resources Canada.
“To calculate magnitude, the amplitude of waves on a seismogram is measured, correcting for the distance between the recording instrument and the earthquake epicentre. Since magnitude is representative of the earthquake itself, there is only one magnitude per earthquake.”
Although most earthquakes — 90% — occur on fault lines that define the Earth’s tectonic plates, they can occur all over the world.
The “Ring of Fire” circling the Pacific Ocean, and including Canada’s west coast, is one of the most active areas in the world.
Every year, hundreds of earthquakes occur in Canada, according to Natural Resources Canada. Only a very tiny minority of these precede a larger earthquake.