Mathematics – Logic
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3425p&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 20, p. 3425-3428
Mathematics
Logic
12
Seismology: Body Wave Propagation, Seismology: Continental Crust, Seismology: Surface Waves And Free Oscillations, Seismology: Instruments And Techniques
Scientific paper
We have applied tomographic techniques to a data set of over 1700, regional distance, Lg amplitudes from 12 stations for paths inside a 30° by 40° region of Central Asia. Our purpose is to create high resolution path correction maps for use in regional distance source discrimination and magnitude determination, as well as to study Lg propagation characteristics in one of the most heterogeneous portions of the earth. For 1.0 Hz data, tomography reduced variance 33%, relative to a best fit, uniform Q model. LgQ varied with geologic region, with low values in Tibet, the Tien Shan and the Pamir range (Q=200 to 400), intermediate values in basins such as the Tarim (Q=500) and high values for platforms and older crust (Q>800). The relatively efficient propagation across the Tarim differs from the poor propagation that is generally observed across sedimentary basins.
Hartse Hans E.
Phillips Scott W.
Randall George E.
Taylor Steven R.
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