NASA Sci Files segment explaining the study of seismology and how seismologists study eartquakes.
Video Rating: 4 / 5
It is a chicken-or-egg question: On Aug. 6, 2007, Utah's Crandall Canyon coal mine collapsed, killing six miners. At about the same time, seismic stations in Utah recorded a seismic event of magnitude 3.9. The question is which came first: Did a minor earthquake cause the mine to collapse? Or was the collapse itself the seismic event?
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