Modelling the seismic velocity structure beneath Southeast Asia

Publications & abstracts:


An example:

Banda arc

We calculate the three-dimensional seismic velocity structure beneath Indonesia from information contained in tectonic (surface) reconstructions. The effect of the surface motions described in a reconstruction on the thermal structure of the underlying mantle is modelled with a kinematic modelling method. This results in a prediction of the present-day temperatures which are converted into seismic (P-wave) velocity anomalies. By comparing the predicted velocity models with tomography results of the area, the quality of the tectonic reconstructions can be evaluated.

The figure shows a vertical section across the Banda arc. From above to below: 1) topographic location map, 2) R-model based on reconstruction of Rangin et al (1990), 3) LL-model based on reconstruction of Lee and Lawver (1995), 4) tomographic BSE-model (Bijwaard et al, 1998).