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DEFINE DATASETS AND WEIGHTS . weight( ), DATA GPS ( obs gps.dat Coo x Coo y Data x Data y Data z Error x Error y Error z ) . weight( ), DATA LEVELING ( obs lev.dat Coo x Coo y Data Error ) . weight( ), DATA EDM ( obs edm.dat Coo x Coo y Coo X Coo y Data Error ) . weight( ), DATA SAR ( obs sar.dat Coo x Coo y Data Error Los x Los y Los z ) DEFINE ELASTIC PARAMETERS .e RIGIDITY (Pa) .
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The VSM tool allows the user to choose among several geometrical sources: sphere (Mogi, 1958), 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.
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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.
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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 (Mogi, 1958), 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.
Volcano and Seismic source Modelling VSM
Elisa Trasatti. "Volcano and Seismic source Modelling VSM." ROHub. Mar 15 ,2018. https://w3id.org/ro-id/a5407028-e611-4199-9742-52d475c82cc2.
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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.
PARAM SETTING MULTI FILE param setting multi is the general setting file containing information about the weights among the datasets, the elastic constants of the halfspace, the number and type of sources as forward model, together with their range of parameters.