Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3414312p&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 14, CiteID L14312
Physics
6
Seismology: Lithosphere (1236), Seismology: Seismic Monitoring And Test-Ban Treaty Verification, Seismology: Tomography (6982, 8180), Tectonophysics: Continental Tectonics: General (0905), Geographic Location: Asia
Scientific paper
The effect of an upper mantle velocity gradient on regional arrival times has been approximated by a cubic distance term, which can be extended to two dimensions for use in tomographic studies. To demonstrate this, we add a laterally varying upper mantle gradient to the standard P n time-term tomography technique, and apply to a data set from Asia compiled using ground truth, event location criteria. We observe strong lateral variations in the gradient, ranging from -0.001 to 0.003 s-1, with high gradients associated with the Tethys convergence zone. The gradient patterns may reflect lateral variations in the thermal gradient of the mantle lid. Variance reduction is 63% with respect to P n tomography without gradients. Adding gradients allows the use of longer path lengths, improving velocity image definition in high-gradient regions with sparse station distribution, such as Tibet.
Ballard Sarah
Begnaud M. L.
Myers Stephen C.
Pasyanos Michael E.
Phillips Scott W.
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