Receiver functions for the Tien Shan analog broadband network - Contrasts in the evolution of structures across the Talasso-Fergana fault

Details Receiver functions for the Tien Shan analog broadband network - Contrasts in the evolution of structures across the Talasso-Fergana fault Receiver functions for the Tien Shan analog broadband network - Contrasts in the evolution of structures across the Talasso-Fergana fault

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.4437k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B3, p. 4437-4448.

Mathematics

Logic

46

Earth Crust, Geological Faults, Seismographs, Structural Properties (Geology), Earth Mantle, Planetary Evolution, Rock Intrusions, Seismology

Scientific paper

We determined the structure of the crust beneath the central and western Tien Shan by analyzing broadband (120 s) analog seismograms of converted P-SV phases generated by earthquakes at teleseismic distances and recorded by 14 seismograph stations. The 1D structures that best explain the waveforms reveal pronounced differences in crustal velocities east and west of the Talasso-Fergana fault. Specifically, the transition zone between the crust and the mantle east of the fault is about two times broader than that west of the fault. Also, velocities at depths between 10 and 35 km are about 10 percent lower in the east, although the depth range of these lower velocities is not well resolved. The areas east of the Talasso-Fergana fault are associated with abnormally low mantle velocities, outcrops of basalt, low Q, and short-wavelength variations in anisotropy.

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