Discussion
Earthquakes caused by the collapse of the roof of a mine or cavern are termed
Answer: D
Correct answer: collapse earthquakes
When the roof of a mine working or a natural cavern falls, the sudden movement of rock radiates seismic waves and is recorded as an earthquake. Such events are small and shallow and their effects are local, but they are genuine earthquakes by any instrumental definition - they are simply not driven by tectonic strain.
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