Section 2.5: Geodynamic Modeling

Head of Section: Prof. Dr. Stephan Sobolev

Our aim is quantitative understanding of the key processes operating in the solid Earth at a large range of spatial and temporal scales at plate boundaries (subduction, collision, rifting and transform faults), within the plates (plumes and large igneous provinces) and in deeper mantle (mantle convection) which are constrained by the multidisciplinary surface observations acquired by the GFZ and international scientific community.

The Earth sciencies also profit from the rapid advances in computer technology. In Section 2.5, we use modern, powerful computers to simulate the movements within the Earth. In our models we introduce innovative know how from the topic area thermomechanical modelling. Our specialty is models with which we can simulate the interplay of those processes which take place on completely different scales in time and space. These integrated-scale models are applied in investigations of the deformation processes at plate boundaries in three dimensions. In addition, our models contribute to the understanding and estimation of natural hazards like earthquakes and tsunamis.

The dynamic processes within the Earth are not only hidden from direct observation because they take place at unreachable depths. They also occur on time scales that are much slower than humans can sense. While the ruptures in earthquakes race at speeds of about 10,000 kilometers per hour through fault zones, the huge lithospheric plates shift at paces slower than a fingernail grows. Earth scientists must thus be able to handle fractions of a second as easily as time spans of millions of years.

In our Section, we have developed numerical methods which can simulate the details of dynamical processes which take place on such dissimilar time scales. We use them, for example, to simulate the rupture processes in earthquakes. The calculated results serve, in part, as input for modelling tsunamis as part of the German Tsunami Early Warning System in Indonesia.

We are particularly interested, however, in simulating the deformation in the Earth's crust and mantle that occurs where lithospheric plates interact, as they do at transform faults or in subduction zones. These interactions generate heat, which not only affects the mechanical behaviour of rocks but can also produce petrological changes. Since we take the thermomechanical and petrophysical changes into account in our simulations, their output is especially realistic. They therefore also contribute as input to a new system for tsunami warnings, called GPS-Shield, based mainly on GPS measurements of crustal deformation. Since our modelling methods take many input parameters into account, they also support the unified analysis and interpretation of many different geophysical, geological and geochemical measurements.

Contact

Profile photo of  Prof. Dr. Stephan Sobolev

Prof. Dr. Stephan Sobolev
Geodynamic Modelling

Heinrich-Mann-Allee 18/19
Building HMA 18/19, room 503
14473 Potsdam
tel. +49 331 288-1940

Assistance

Mr. Till Bruens
Assistance of Geodynamic Modelling

Heinrich-Mann-Allee 18/19
Building HMA 18/19, room 509
14473 Potsdam
tel. +49 331 288-1941