|
|
|
UDC (550.834.32.05/.07+550.834.5.05/.07)(571.56+571.65)
EFFECTIVE SEISMIC MODELS OF MEDIA USED IN DSS OPERATIONS ON BASE LINES IN EASTERN RUSSIA
V. M. Solovyev, V. S. Seleznev, A. S. Salnikov, T. V. Kashubina, A. E. Shenmaier
Accuracies of boundary depths and velocity parameters in using an effective medium model to interpret data of deep seismic investigations on the base lines in the East of Russia have been estimated. Within the frame of the effective medium model an inverse problem has been solved by theoretical reflection and refraction curves calculated by the raypath modeling method of a 2D inhomogeneous medium model in interpreting DSS data along the 3DV Khandyga-Kyubeme-Susuman line 800 km long. It is shown that within the frame of the effective medium model depths to the Moho discontinuity and boundary velocities are reconstructed with acceptable accuracy of up to 3 % on the average. It is also demonstrated that without evidence on refractions traced at great (~100...120–180...200 km) bases, it is practically impossible to reconstruct velocity conditions in the lowermost crust by first-arrival data only.
Key words: Deep Seismic Sounding, effective medium model, raypath modeling, reflections and refractions, time-distance curves, stacking velocity.
|
|
|
|
© SNIIGGiMS, 2017. All rights reserved. | 67 Krasny pr., Novosibirsk, 630091 Russia. Tel.: 73832214947, 73832214980, fax: 73832214947