Finite-Element Modeling of the Blockage and Scattering of LG Propagation

The problem of Lg wave blockage is being investigated using finite element models of island margin, basin, and basin with an uplifted Moho to simulate wave propagation across the Barents Sea basin. Results from the first year follow. The efficiency of the crust as a Lg wave guide strongly depends on...

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Bibliographic Details
Main Author: Teng, Yu-chiung
Other Authors: HENRY KRUMB SCHOOL OF MINES NEW YORK ALDRIDGE LAB OF APPLIED GEOPHYSICS
Format: Text
Language:English
Published: 1993
Subjects:
Seismology
*SEISMIC DETECTION
*WAVE PROPAGATION
*MOHOROVICIC DISCONTINUITY
*SEISMIC WAVES
ALGORITHMS
FREQUENCY
MODELS
COMPUTER AIDED DIAGNOSIS
BARENTS SEA
HIGH VELOCITY
SEDIMENT TRANSPORT
FINITE ELEMENT ANALYSIS
UNDERGROUND EXPLOSIONS
EFFICIENCY
*LG WAVE PROPAGATION
ISLAND MARGIN MODEL
UPLIFTED MOHO
PE61102F
WUAFOSR2309AS
Barents Sea
Online Access:http://www.dtic.mil/docs/citations/ADA277430
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA277430
Description
Summary:The problem of Lg wave blockage is being investigated using finite element models of island margin, basin, and basin with an uplifted Moho to simulate wave propagation across the Barents Sea basin. Results from the first year follow. The efficiency of the crust as a Lg wave guide strongly depends on the frequency content of an impulsive source. The effects of a basin on Lg propagation also depends on the basin width and the velocity contrast between the sedimentary basin and the surrounding granitic/basaltic crust. For a high velocity contrast, the Lg wave form is significantly lengthened. The presence of an uplifted Moho alone does not appear to have a major blockage effect on Lg wave propagation. The finite element codes with the fast execution algorithm prove to be well suited as tools for the modeling purposes intended in this research.

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