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|Authors: ||Tramelli, A.*|
Del Pezzo, E.*
Fehler, M. C.*
|Title: ||3D Scattering Image of Mt. Vesuvius|
|Title of journal: ||Bulletin of the Seismological Society of America|
|Series/Report no.: ||3/99 (2009)|
|Publisher: ||SEISMOLOGICAL SOC AMER|
|Issue Date: ||2009|
|Keywords: ||Mt. Vesuvius|
|Abstract: ||In this article we apply a passive scattering-imaging method, derived
from the method developed by Nishigami (1991) to data from the coda of the local
volcano-tectonic (VT) earthquakes of Mt. Vesuvius. This method provides the space
distribution of the strong scatterers together with a rough estimate of their strength.
In the development of our method we use a realistic raytracing calculated with a raybending
approach in the 3D velocity model of Mt. Vesuvius structure obtained with
travel-time inversion. The inversion procedure adopted for the scattering imaging in
the present study is based on the conjugate gradient method (CGM). The volume under
study is divided into cubic cells with different dimensions in a multiscale approach.
We obtain the best resolution (900 m cubic cell size) in the central part of the volume
under study (roughly in a radius of 4 km centered in the crater) within a depth of 5 km.
We analyzed the coda signals after filtering in two frequency bands, the first centered
at 12 Hz and the second at 18 Hz, where most of the seismic energy is concentrated.
Results show that most of the strong scatterers are located in the depth range between
the surface and 3000 m below the sea level, in correspondence with the crater axis
where most of the seismicity occurs. Part of the scatterers are located in the zones
characterized by the maximum velocity contrasts.|
|Appears in Collections:||04.06.07. Tomography and anisotropy|
Papers Published / Papers in press
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