The ground on the western edges of Naples, Italy is rising, spurring worries of a possible volcanic eruption, but scientists now think they know exactly what is causing the uplift and may be able to better predict any potential eruption.
Using GPS measurements, a group of scientists at the National Institute of Geophysics and Vulcanology in Italy monitored the ground’s motions for several years, and based on the patterns they observed, they believe the uplifting is caused by magma intruding from a shallow chamber.
http://www.livescience.com/forcesofnature/...und_uplift.html