Numerical simulations were carried out in order to relate crustal deformation processes to the surface motions constrained within different GPS-campaigns between 1992 and 1998. In order to simulate the crustal deformation processes, the 3d - distinct element code 3DEC was used. The main part of the presentation deals with the Ms: 7.3, Aug 19, 1992 Suusamyr earthquake and its induced co-seismic surface motions. Aims of the modelling include to check different focal models that explain the earthquake rupture process derived from seismological investigations, and to test different focal parameters. Using information from the measured surface deformations, the model of the earthquake rupture process with the best fit to the GPS-based displacement vectors was selected. The resolving parameters that describe the main shock are: mean stress drop 7 MPa, peak stress drop 11.9 MPa, mean dislocation 1.39 m, and peak dislocation 2.37 m. In addition to the above described models, further numerical simulation has been conducted in order to explain the crustal deformation measured using GPS within the N-Pamirs, Tien Shan and Tarim. The presentation gives an overview of some first and important results.

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Schelle, H.; Reigber, C.; Angermann, D.; Klotz, J.; Michel, G. (1999): Numerical modelling of crustal deformation in the Tien Shan. Comparison with GPS-measurements. 22nd General Assembly of IUGG and 30th General Assembly of IASPEI (Birmingham, UK 1999), 77.