Do earthquakes cause volcanoes?
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USGS Frequently Asked Questions

Question: Do earthquakes cause volcanoes?

Answer:

No, there are different earth processes responsible for volcanoes. Earthquakes may occur in an area before, during, and after a volcanic eruption, but they are the result of the active forces connected with the eruption, and not the cause of volcanic activity.

Source of this FAQ:
http://earthquake.usgs.gov/faq/myths.html

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