Publication Date:
2017-04-04
Description:
The steep topography, which characterizes certain volcanic areas, may strongly influence
the displacement field associated to seismic signals. As a consequence, the
interpretation of seismic data for the inversion of the seismic source and the crustal
structure properties should carefully take into account these effects. We propose a set
of numerical simulations for seismic wave propagation in a 3-D homogeneous model
of Stromboli volcano, Italy, based on the application of a pseudospectral technique.
The model assumes a topography with a discretization of 100 m on the horizontal directions,
and 1 m on the vertical direction, while bathymetry is not yet included. We
estimate the surface displacement field for different seismic sources, reproducing possible
phenomena occurring during an eruptive process. These include purely isotropic
sources, the realistic inclusion of an additional deviatoric CLVD component, which
may take into account the effects of explosive events in presence of conduits and the
final fall-out of material at the volcanic surface. Different durations of the source time
function are tested in order to compare the effects of topography for seismic radiations
with a variable range of frequency content. The comparison of results highlights the
effects, which are strictly related to the presence of a steep topography.
Description:
Published
Description:
Vienna
Description:
3.6. Fisica del vulcanismo
Description:
open
Keywords:
Stromboli
;
source inversion
;
04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Oral presentation
Permalink
