Physics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30d...2b&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 4, pp. 2-1, CiteID 1153, DOI 10.1029/2002GL016115
Physics
4
Seismology: Body Wave Propagation, Seismology: Continental Crust (1242), Tectonophysics: Continental Tectonics-Extensional (0905)
Scientific paper
Uppermost mantle P wave velocity structure beneath the Baikal rift and southern margin of the Siberian Platform has been investigated by using a grid search method to model Pnl waveforms from two moderate earthquakes recorded by station TLY at the southwestern end of Lake Baikal. The results yielded a limited number of successful models which indicate the presence of upper mantle P wave velocities beneath the rift axis and the margin of the platform that are 2-5% lower than expected. The magnitude of the velocity anomalies and their location support the presence of a thermal anomaly that extends laterally beyond the rift proper, possibly created by small-scale convection or a plume-like, thermal upwelling.
Brazier Richard A.
Nyblade Andrew A.
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