volcano_source_modelling_vsm
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Research Area:
Earth sciences
Title:
Volcano and Seismic source Modelling VSM
Description:
The VSM (Volcano and Seismic source Modelling) tool is a Fortran code used to model ground deformation detected by the most common geodetic techniques (interferometric SAR, GPS, leveling and EDM - Electro-optical Distance Measuring). VSM performs geophysical inversion modeling of ground deformation to retrieve the parameters of the causative magmatic source, or to retrieve the seismic source parameters. A magmatic source can be approximated (modeled) by a confined part of crust with a certain shape (e.g., a sphere, a sill, a dyke, a spheroid), which is inflating/deflating because of a change in the internal magma/gas pressure. Each shape generates a specific surface deformation pattern, and comparing the modeled deformation with that actually observed at the surface, it is possible to estimate the best-fit source parameters. The same applies to the seismic source, that is commonly described ad a rectangular plane with dip and strike angles. The VSM tool carries out this task by minimizing the difference between the observed and the computed displacement field, through a global optimization process.The VSM tool allows the user to choose among several geometrical sources: sphere (McTigue, 1987), spheroid (Yang et al., 1988), ellipsoid (Davis, 1986), fault (Okada, 1992), sill-like source (Fialko et al., 2001) and retrieves the best-fit source parameters. More sources can be combined. The VSM software tool is developed by INGV, in Fortran 90. The non-linear inversion core is by M. Sambridge (1999). This Research Object contains the OSX and Linux executables, documentation and input/output if a real example applied to Campi Flegrei (Italy) with InSAR and GPS data. Please refer to documentation for further information. Contact: Elisa Trasatti elisa.trasatti@ingv.it
Status:
LIVE
Creator:
Creation date:
15 March 2018, 17:55 (last modification:09 January 2019, 09:19)
Credits:
N/A[Elisa Trasatti]
Research Object Type:
Workflow Research Object
Keywords:
volcano deformation; geodetic data; magmatic source; source model
Purpose:
Access level:
Geolocation:
0 . POLYGON
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License:
Copyright holder:
INGV
Ancillary Documentation:
Sketch:
galland-epsl-2012-figura-2.jpg
Content based annotations
Concept:
Source,tool,shape,inversion,deformation
Domain:
geometry,volcanology
Frequent expression:
inversion core,VSM tool