Three-dimensional elastic wave velocity structure of the western and central Tien Shan

Details Three-dimensional elastic wave velocity structure of the western and central Tien Shan Three-dimensional elastic wave velocity structure of the western and central Tien Shan

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9815779r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B9, p. 15,779-15,795.

Physics

63

Earth Planetary Structure, Earthquakes, P Waves, Propagation Velocity, S Waves, Seismology, Geodynamics, Sediments, Structural Properties (Geology), Tectonics

Scientific paper

One- and three-dimensonal elastic wave velocity structures of the crust and upper mantle beneath the Tien Shan mountain belt are determined on the basis of the arrival times of compressional (PC) and shear (S) waves generated by earthquakes at local and teleseismic distances and recorded by seismographs located in the western and central Tien Shan. The best-fit 1D structures suggest that the average depth of the Mohorovicic discontinuity in this area is 50 km. The 3D structure of the upper crust reveals thick sediments within each of the major depressions in the region. A 7-km-thick wedge of sediment beneath the Chu Depression is outlined at depth by a south dipping plane of seismic activity, suggesting the presence of an active decollemont. It is suggested that the Tien Shan may not owe its rejuvenation simply to its location at the northern edge of a strong Tarim basin but rather to an anomalous upper mantle that was easier to deform than the surrounding lithosphere.

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