See www.sciencedaily.com/releases/2010/06/100602131346.htm … if tectonic plates colliding cause volcanoes why do some volcanoes erupt far from a plate boundary? A study in Nature suggests that volcanoes, and even mountains, in the Mediterranean region, can grow from the pressure of the semi liquid mantle pushing on earth’s crust from below.
Volcanoes and the Mantle
4 June 2010Geology