Static Displacement Modelling with Talpa

The tool talpa (Talpidae; the mole) enables interactive modelling of static displacement sources.

It acts as a front end for kite.SandboxScene, a modelling sandbox for InSAR scenes.

Examples for a programmatic interaction with the sandbox can be found /examples/05-sandbox.

Available Static Displacement Sources

The SandboxScene can hosts different types of displacement source by levering different processing engines, analytical and numerical. The different types of dispalcement source can be mixed within a single sandbox

1. Okada Source

A basic analytical displacement source is OkadaSource. We will use an Okada source in examples below, however the other’s sources handling is similar.

2. Pyrocko Sources

We leverage different sources from Pyrocko. These sources need a pre-build Green’s function store, which enable layered half-space models. (see https://pyrocko.org/current/apps/fomosto/index.html)

Implemented source types - Point sources and extended.

3. Compound Dislocation Sources

Analytical dilatation point sources extending Mogi sources are implemented in kite:

for more information see http://www.volcanodeformation.com and [1].

[1]Nikkhoo, M., Walter, T. R., Lundgren, P. R., Prats-Iraola, P. (2017): Compound dislocation models (CDMs) for volcano deformation analyses. - Geophysical Journal International, 208, 2, p. 877-894.

Adding Sources

A selection of different displacement sources can be added to the modelling sandbox by right clicking on the source list.

../_images/talpa-src_add.png

Adding a source to the kite.SandboxScene using the GUI.

Manipulating Sources

The spatial parameters of the the sandbox’s source can be interacted with by click-and-drag. Advanced parameters, in this case dip, rake and slip are accesses through the editing dialog.

../_images/talpa-src_mod.gif

Interactive manipulation of a OkadaSource within the sandbox.

Parametrisation through the source’s editing dialog (<right-click> ‣ Edit).

../_images/talpa-src_dialog.png

Source parameter dialog for an OkadaSource.

Saving and Loading a Sandbox

The scene can be saved and loaded through the File menu.