Discussion
Volcanic earthquakes are generally
Answer: B
Correct answer: small and confined to the volcanic area
Volcanic earthquakes are produced by magma forcing its way through rock and by the fracturing that accompanies it, so they are limited in size by the volume of the magmatic system and are concentrated beneath and around the volcano. That local concentration is what makes them useful: swarms of them are one of the best short-term indicators that an eruption is approaching.
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