HEAD WAVE TIME SECTIONS OF THE UPPER EARTH’S CRUST ALONG THE SURVEY BASE LINE 3-DV (NORTHWESTERN BLOCK)

P. O. Polyansky 1, A. S. Salnikov 2, A. F. Emanov 1, V. V. Zhabin 2

1 Altai-Sayan Branch of the Geophysical Survey of RAS, Novosibirsk, Russia; 2 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia

The dynamic head wave conversion method allowed building time sections of various tectonic structures: the Aldan syneclise, the Predverkhoyansky foredeep, the Sette-Daban tectonic block, and the Verkhoyano-Kolymskaya folded system. The refractors present in the time sections acquired occur at a depth of 0.7–2.1 km. The refractor velocities of head waves within the Sette-Daban folded system are 6.2–6.8 km/s, exceeding those within the Predverkhoyansky foredeep (4.2–5.2 km/s) and within the western Verkhoyano-Kolymskaya folded system (4.5–4.7 km/s). The S to P head wave travel time ratio was calculated for the survey base line block crossing the Sette-Daban block and the western Verkhoyano-Kolymskaya folded system. Within the Sette-Daban zone, the Ts/Tp ratios (1.8–1.95) are higher than in the Verkhoyano-Kolymskaya folded system (1.65–1.75).

Key words: geophysical survey base line 3-DV, head waves, Wiener filter.

DOI 10.20403/2078-0575-2017-2-112-122 

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