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Bump! Boom!

23 Oct

This is a very well written and informative post about Springhill, N.S.’s October 23, 1958 earthquake. And while you are at “Little Bits of History” I suggest you have a look around! -tkmorin

Little Bits of History

October 23, 1958: Springhill, Nova Scotia, Canada is hit by an earthquake. When an underground earthquake strikes at the location of human mining efforts, it is referred to as a “bump.” There is some speculation the mining efforts trigger the geologic event by placing variable stresses on underground stratum. While actively mining, shifting pressures can cause supporting galleries to collapse or disintegrate. The town of Springhill was dependent on the coal mining industries. They had already suffered through the 1891 fire and the 1956 explosion. The mines remained productive.

In No. 2 mine, the method of removal had been improved to forestall disaster. The underground tunnel was one of the deepest in the world. The sloping shaft went ever downward for 14,200 feet and reached 4,000 feet below the surface. The “room and pillar” technique had been changed twenty years earlier to the safer “long wall retreating” method. A small…

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