Analysis of Soviet DSS Records for Propagation and Modeling of Lg Blockage across Major Crustal Features

To develop our model, we analyze the data obtained using 42 chemical explosions along the profile. Applying a travel-time tomographic inversion method, we developed a velocity model and estimates of its resolution. Two important resolved features of the model are: 1) high velocity block at the base...

Full description

Bibliographic Details
Main Authors: Smithson, Scott B., Schatzman, James C.
Other Authors: WYOMING UNIV LARAMIE DEPT OF GEOLOGY
Format: Text
Language:English
Published: 1997
Subjects:
Geology
Geochemistry and Mineralogy
*EARTH MANTLE
*COMPRESSION WAVES
USSR
TWO DIMENSIONAL
EARTH CRUST
TOMOGRAPHY
SEISMIC VELOCITY
TRAVEL TIME
*VELOCITY MODELS
DSS(DEEP SEISMIC SOUNDING)
Barents Sea
Kola Peninsula
kola peninsula
Online Access:http://www.dtic.mil/docs/citations/ADA329400
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA329400
Description
Summary:To develop our model, we analyze the data obtained using 42 chemical explosions along the profile. Applying a travel-time tomographic inversion method, we developed a velocity model and estimates of its resolution. Two important resolved features of the model are: 1) high velocity block at the base of the crust under the Baltic Shield, 2) crustal roots under the Ural Mountains. Using the data from 3 nuclear explosions in the profile we developed a 2-D upper mantle P-wave velocity model. The model supports the conclusion of the roots under the Urals, and suggests a southeast dipping interface at about 80 km in the upper mantle. A high-frequency phase following teleseismic Pn from the PNEs is interpreted as a "whispering-gallery" phase and is used to estimate attenuation within the upper mantle. Lg from 2 PNEs is blocked between sedimentary basins and the Ural Mountains. A marine-land profile recorded from the Barents Sea to the Kola Peninsula shows a crustal thickness of about 38-40 km at the coast.

Similar Items