ANALYSES OF URSEIS MOHO REFLECTIONS BENEATH THE PREURALIAN FOREDEEP OF THE URAL MOUNTAINS, RUSSIA

Title:	ANALYSES OF URSEIS MOHO REFLECTIONS BENEATH THE PREURALIAN FOREDEEP OF THE URAL MOUNTAINS, RUSSIA
Author:	Atef, Ali Hadi, Mr
Description:	Reprocessing of the western-most portion of the Urals Seismic Experiment and Integrated Studies (URSEIS) survey across the southern Urals in Russia provided enhanced images of the crust and crust-mantle boundary (Moho). Shallow (less than 6 km deep), continuous subhorizontal reflections were associated with the base of the foreland basin. Those reflections appeared to shallow to the east. The middle and lower crust were generally reflective across the study area. The crust-mantle boundary (Moho) was imaged as high amplitude, continuous, subhorizontal reflections across the entire profile in the stacked section. The Moho reflections were dominated by low frequency arrivals that appeared as single and multi-cycle wavelets. Amplitude, frequency content and velocity analyses of those Moho reflections revealed that the Moho varied laterally on the kilometer-scale and vertically at the 100-meter scale. Power spectrum analyses appeared to indicate that the Moho represented a change from granulite to eclogite in a layer located at 43.8 km depth that varied in thickness from 125-200 m. Other reflections observed below Moho depths were determined to be crustal shear wave reflections based on their low stacking velocities.
Permanent Link:	http://rave.ohiolink.edu/etdc/view?acc_num=akron1181569948 http://hdl.handle.net/2374.OX/3677
Date:	2007

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