Publication Date:
2017-04-04
Description:
Long time series of fumarolic compositions at Campi Flegrei (Italy),
Mammoth Mountain (California), Panarea (Italy) and Nisyros (Greece) show rapid
increases, up to orders of magnitude, of the CO2/CH4 ratio systematically with the
occurrence of volcanic unrest periods. These easily detected anomalies originate with
the arrival of CH4-poor magmatic fluids in the shallower levels of the volcanoes. The
data suggest that volcanoes are characterized by magmatic activity at depth also in
periods of apparent quiescence. The activity is constituted by the pulsing release of large
amount of fluids which either cause unrest periods (seismicity and ground deformation)
or possibly could precede volcanic eruption. This type of volcanic activity can be
monitored trough the classical geophysical techniques together with the systematic
sampling and analysis of fumaroles.
Description:
In press
Description:
4.5. Degassamento naturale
Description:
JCR Journal
Description:
reserved
Keywords:
fumarole
;
magma degassing
;
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
