As many Montrealers were r e m i n d e d early on Wednesday morning, this city is in an earthquake zone. About 12:19 a.m., an earthquake estimated at 4.5
on the Richter scale shook the Montreal region; the epicenter was apparently close to St. Amable on the South Shore. There were many reports of people being woken up, but no reports of damage or injuries from the earthquake. Highways crews were apparently out verifying the Turcot Interchange after Wednesday's earthquake, but they had reported nothing amiss by the end of the day. The October 10 Montreal earthquake was very minor compared to the 9.0 Richter scale earthquake that hit Japan on March 11, 2011, triggering up to a 40-meter tsunami. The largest-known earthquake in Montreal occurred on September 16, 1732 and registered an estimated 5.8 on the Richter scale.That 1732 earthquake was big enough to damage 300 houses according to Wikipedia, as well as destroying another 185 buildings in a subsequent fire. The map here shows historic seismic activity around the Montreal area. Shown here are the locations and dates of earthquakes of at least 5 on the Richter scale (yellow circles), earthquakes of 4 to 4.99 magnitude (blue circles) and tremors of 3 or more (purple circles). There have also been many small tremors in our region; generally it is difficult to notice
Source: U.S. Geological Service The map here shows yellow circles and dates for earthquakes registering 5.0 or more on the Richter scale. Wednesday's 4.5 earthquake will add another blue circle with an epicentre near St. Amable.
seismic activity that registers less than 2.5 on the Richter scale. The Richter scale is logarithmic, meaning that a 9.0 earthquake has a "shaking power" 10,000 times stronger than a 5.0 earthquake.
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4 OCTOBER 13, 2012 *
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