Deep structure of the baikal and other continental rift zones from seismic data |
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| Authors: | NN Puzyrev MM Mandelbaum SV Krylov BP Mishenkin GV Petrik GV Krupskaya |
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| Institution: | 1. Institute of Geology and Geophysics, Novosibirsk U.S.S.R.;2. Eastern Geophysical Trust, Irkutsk U.S.S.R. |
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| Abstract: | Abyssal variations beneath the Baikal rift zone are revealed in an irregular seismic stratification of the crust, the presence of an intracrust waveguide and by the vast (> 200,000 km2) underlying area of anomalously low velocity (Pn = 7.6−7.8 km/sec) uppermost mantle. In its abyssal structure the Baikal rift is heterogeneous along the strike, with sharp changes in crustal thickness (35–50 km).Comparison of first-arrival seismic-velocity curves and also the respective velocity columns reveals the essential similarity of upper-mantle seismic cross-sections for all continental rift zones. The anomalous upper layer of the mantle (ca. 7.7 km/sec) is relatively thin (15-13 km) and can be linked with the mantle waveguide only locally. |
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