Publication Date:
2017-04-04
Description:
Assessment of time and space relationships among
magmatism, volcanism, and resurgence of mediumsize
calderas is a necessary tool to formulate a general
model for their dynamics which also permits to forecast
their evolution.
To define a general hypothesis for the Campi Flegrei
caldera, in a persistent state of unrest, the Ischia and
Pantelleria medium-size resurgent structures, in variable
stages of evolution, have also been investigated.
In particular some parameters such as the structural
and volcanological evolution, with emphasis on resurgence
dynamics and coeval volcanism, and the evolution,
present state and role of the magmatic system
in resurgence, have been defined. For the Campi Flegrei
caldera, the data collected during unrest episodes
have also been taken into account, together with those
from past eruptions. They corroborate the hypothesis
that the unrest episodes are transient short-term events
within the long-term deformation related to caldera resurgence.
The geometry of the short-term deformation
is strictly related to the structural setting of the caldera.
The sub-surface processes have been dominated by
joint degassing of two magmatic bodies, at 3-4 and 8 (or
more) km depth, with the shallower formed by magma
ascending from the deeper body. Both bodies contribute
to the hydrothermal system, but the shallow magma
is fluxed by the continuous upstream of CO2-richer gas
released by the deep body. The two-layer degassing
magma allows explaining geochemical and petrological
features of unrest and volcanism.
The joined interpretation of geological, geodetic, and
geochemical data on the three calderas is an innovative
approach that adds a time-perspective on how resurgent
calderas behave. The proposed general hypothesis
will help in long- and short-term volcanic hazards
assessment and will support Civil Defence Authorities in
elaborating actions devoted to volcanic risk reduction.
Description:
Published
Description:
Puerto de la Cruz, Tenerife (Canary Islands,Spain)
Description:
open
Keywords:
the Case of Campi Flegrei
;
Ischia and Pantelleria Structures
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
05. General::05.08. Risk::05.08.01. Environmental risk
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Abstract
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