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.
The VSM (Volcano Source Modeling) workflow models ground deformation detected by the most common geodetic techniques (interferometric SAR, GPS, and leveling). VSM performs geophysical inversion modeling of observation of ground deformation to retrieve the parameters of the causative magmatic source. 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 is going to generate a certain 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 VSM tool carries out this task by minimizing the difference between the observed and the computed displacement field, through a process called data inversion. The VSM software tool is developed by INGV, in Fortran 90. The non-linear inversion core is by M. Sambridge. More details can be found in the documentation included 'HOW_TO_USE' file. This RO contains the results of the geodetic inversion of the 2004-2006 InSAR data at Campi Flegrei (Italy) due to the action of a deep magmatic source. Data can be also found in the following Research Object Link: http://sandbox.rohub.org/rodl/ROs/InSAR_Campi_Flegrei_2004_2006-release/ DOI: 10.5072/ro-id.F95NIHF8QA The workflow included can be run in the Taverna Runner in the Virtual Research Environment provided by EVER-EST project https://vre.ever-est.eu/supersites/ Link to the executable VSM_exe_url: http://box.everest.psnc.pl/f/11ef876776/?raw=1
VSM from Taverna - Campi Flegrei 2004-2006
INGV. "VSM from Taverna - Campi Flegrei 2004-2006." ROHub. Feb 28 ,2018. https://w3id.org/ro-id/289fac63-cb7a-4198-a55a-786c3aeb61c6.
VSM VOLCANIC SOURCE MODELLING Elisa Trasatti, March (elisa.trasatti@ingv.it) The VSM (Volcano Source Modeling) is a tool 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 observation of ground deformation to retrieve the parameters of the causative magmatic source.
Thisrequires no further solving of the forward problem, but from the new resampled ensemblewe are able to obtain measures of resolution and trade off in the model parameters, or anycombinations of them.The new ensemble inference algorithm is illustrated on a highly non linear waveform inversionproblem.
Each shape is going to generate a certain 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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SUMMARYMonte Carlo direct search methods, such as genetic algorithms, simulated annealing etc., areoften used to explore a finite dimensional parameter space.
The VSM tool carries out this task by minimizing the difference between the observed and the computed displacement field, through a process called data inversion.
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The VSM (Volcano Source Modeling) workflow models ground deformation detected by the most common geodetic techniques (interferometric SAR, GPS, and leveling). VSM performs geophysical inversion modeling of observation of ground deformation to retrieve the parameters of the causative magmatic source.
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Each shape is going to generate a certain 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 problem is one of inversion of receiverfunctions for crustal seismic structure, which is known to be highlynon linear (Ammon et al. ). The resampling algorithm is usedto calculate Bayesian measures of resolution and trade off, fromtwo separate ensembles generated with different search methods.