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Sometimes seismic waves occur when the roof or walls of a mine collapse. These can sometimes be felt by people near the mine. The largest underground explosions, from tests of nuclear warheads (bombs), can create seismic waves very much like large earthquakes.
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www.geo.mtu.edu/UPSeis/why.html
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Earthquakes occur all the time all over the world, both along plate edges and along faults. ... Most earthquakes occur along the edge of the oceanic and continental plates. The earth's crust (the outer layer of the planet) is made up of several pieces, called plates. The plates under the oceans are called oceanic plates...
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www.geo.mtu.edu/UPSeis/where.html
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Although they can occur anywhere on the planet with little or no warning, the most extreme earthquakes occur near plate boundaries, as the plates converge (collide), diverge (move away from another), or shear (grind past one another).
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earth.rice.edu/mtpe/geo/geosphere/hot/3earthquakes.html
earth.rice.edu/mtpe/geo/geosphere/hot/3earthquakes.html
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Normal faults occur in response to pulling or tension; the overlying block moves down the dip of the fault plane. Thrust (reverse) faults occur in response to squeezing or compression; the overlying block moves up the dip of the fault plane. ... Geologists have found that earthquakes tend to reoccur along faults,
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pubs.usgs.gov/gip/earthq1/how.html
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Where Earthquakes Occur ... Most earthquakes occur at the boundaries where the plates meet. In fact, the locations of earthquakes and the kinds of ruptures they produce help scientists define the plate boundaries. ... Earthquakes can also occur within plates, although plate-boundary earthquakes are much more common.
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pubs.usgs.gov/gip/earthq1/where.html
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Earthquakes occur most frequently on, or near, the edges of plates where stress is most concentrated. ... Along the Canadian west coast, earthquakes large enough to cause damage occur about every ten years. In the last 100 years, several major earthquakes have occurred in B.C. or along its coast.
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www.em.gov.bc.ca/Mining/Geolsurv/Surficial/quake/eq3.ht...
www.em.gov.bc.ca/Mining/Geolsurv/Surficial/quake/eq3.htm
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