Abstract
Campi Flegrei caldera, including the extremely urbanised city of Naples,
is the most risky volcanic area in the World. The last eruption in
the area (1538) occurred at the end of some decades of ground uplift,
superimposed to secular subsidence. During the last four decades,
it experienced a huge uplift phase, reaching about 3.5 m in 1985,
when a subsidence phase started. Recent geodetic data demonstrate
that such a subsidence phase has terminated, and a new uplift episode
started in November 2004, with a low but increasing rate leading
to about 0.04 m of uplift till the end of October 2006. A new indicator,
based on the monitoring of maximum horizontal to vertical displacement
ratio with continuous GPS, indicates that this uplift is likely to
be associated with input of magmatic fluids from a shallow magma
chamber. The method is promising to monitor magma intrusion processes,
at this and other volcanoes.
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