Q: Distinguish between volcanic earthquake and explosion earthquake.
A: There are four different types of earthquakes: tectonic, volcanic, collapse and explosion.
A volcanic earthquake is associated with volcanic activity due to the movement of magma beneath the surface of the Earth. Volcanic earthquake is caused by slip on a fault near a volcano.
An explosion earthquake is an earthquake activity triggered due to the detonation of a nuclear and/or chemical device.
According to the United States Geological Survey (USGS), the underground thermonuclear tests conducted by the U.S. at the western end of the Aleutian Islands in Amchitka in 1971 caused energy release equivalent to a magnitude 6.9 earthquake.