Light earthquake shakes region

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An earthquake measuring 4.3 magnitude and located roughly 200 km north of Ottawa shook the region lightly Saturday afternoon.

According to Earthquakes Canada, a branch of the federal department of Natural Resources, the quake struck at 3:03 pm Saturday, at a spot 46.93 north longitude and 75.92 west at a depth of 18 km.

The quake was just the latest in what’s known as the Western Quebec Seismic Zone, an area that stretches roughly from Montreal to Temiscaming.

Other recent earthquakes include a 3.3 magnitude quake at a point about 10 km south of Petawawa on May 14, 2016, a 5.2 quake northeast of Shawville in May 2013, and a 5.0 earthquake in June 2010 near Val-des-Bois, Quebec.

According to the Earthquakes Canada website, “magnitude” is a measure of the amount of energy released during an earthquake, frequently described using the Richter scale.

The magnitude scale is logarithmic. This means that, at the same distance, an earthquake of magnitude 6 produces vibrations with amplitudes 10 times greater than those from a magnitude 5 earthquake, and 100 times greater than those from a magnitude 4 earthquake.

The agency says earthquakes up to magnitude 5.4 are “often felt, but rarely cause damage.”

“Major” earthquakes are those of magnitude 7.0 and greater.

Of Saturday’s quake, the website says the event was “weakly felt in the Mont-Laurier and Maniwaki regions,” although it was also felt by residents in the Deep River, Chalk River area.

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