2024-03-28T10:42:18Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/241162021-06-14T09:24:08Zcom_10261_87com_10261_8col_10261_340
2010-05-10T10:06:43Z
urn:hdl:10261/24116
4D volcano gravimetry
Battaglia, Mauricio
Gottsmann, Joachim
Carbone, Daniele
Fernández Torres, José
Earth crust
Geomorphology
Geophysical techniques
Gravity
Volcanology
Time-dependent gravimetric measurements can detect subsurface
processes long before magma flow leads to earthquakes or
other eruption precursors. The ability of gravity measurements to
detect subsurface mass flow is greatly enhanced if gravity measurements
are analyzed and modeled with ground-deformation
data. Obtaining the maximum information from microgravity
studies requires careful evaluation of the layout of network
benchmarks, the gravity environmental signal, and the coupling
between gravity changes and crustal deformation.When changes
in the system under study are fast (hours to weeks), as in hydrothermal
systems and restless volcanoes, continuous gravity observations
at selected sites can help to capture many details of the
dynamics of the intrusive sources. Despite the instrumental effects,
mainly caused by atmospheric temperature, results from
monitoring at Mt. Etna volcano show that continuous measurements
are a powerful tool for monitoring and studying volcanoes.
Several analytical and numerical mathematical models can
beused to fit gravity and deformation data. Analytical models offer
a closed-form description of the volcanic source. In principle,
this allows one to readily infer the relative importance of the
source parameters. In active volcanic sites such as Long Valley
caldera (California, U.S.A.) and Campi Flegrei (Italy), careful
use of analytical models and high-quality data sets has produced
good results. However, the simplifications that make analytical
models tractable might result in misleading volcanological interpretations,
particularly when the real crust surrounding the
source is far from the homogeneous/isotropic assumption. Using
numerical models allows consideration of more realistic descriptions
of the sources and of the crust where they are located (e.g.,
vertical and lateral mechanical discontinuities, complex source
geometries, and topography). Applications at Teide volcano
(Tenerife) and Campi Flegrei demonstrate the importance of this
more realistic description in gravity calculations.
2010-05-10T10:06:43Z
2010-05-10T10:06:43Z
2008-11-20
artículo
Geophysics 73(6):WA3-WA18(2008)
0016-8033
http://hdl.handle.net/10261/24116
10.1190/1.2977792
1942-2156
eng
http://dx.doi.org/10.1190/1.2977792
openAccess
Society of Exploration Geophysicists