Analysis of 3D Complex Structure and Heterogeneity Effects on Formation and Propagation of Regional Phases in Eurasia.
This is the final report for this grant to develop new three-dimensional wave propagation techniques for high frequency waves in heterogeneous media. The report is divided into four sections, each being a published paper sponsored by this grant. In the first section we formulate a one-way wide-angle...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1994
|
Subjects: | |
Online Access: | http://www.dtic.mil/docs/citations/ADA291214 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA291214 |
id |
ftdtic:ADA291214 |
---|---|
record_format |
openpolar |
spelling |
ftdtic:ADA291214 2023-05-15T17:47:14+02:00 Analysis of 3D Complex Structure and Heterogeneity Effects on Formation and Propagation of Regional Phases in Eurasia. Lay, Thorne Wu, Ru-Shan CALIFORNIA UNIV SANTA CRUZ INST OF TECTONICS 1994-12-13 text/html http://www.dtic.mil/docs/citations/ADA291214 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA291214 en eng http://www.dtic.mil/docs/citations/ADA291214 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Seismology Nuclear Weapons *SEISMIC WAVES *NUCLEAR EXPLOSION DETECTION *EARTHQUAKES USSR SCATTERING HIGH FREQUENCY ACOUSTIC WAVES WAVEGUIDES SEISMIC DETECTION THREE DIMENSIONAL WAVE PROPAGATION EARTH CRUST SEDIMENTS EURASIA PRIMARY WAVES(SEISMIC WAVES) ELASTIC WAVES SECONDARY WAVES BORN APPROXIMATIONS RALEIGH WAVES Text 1994 ftdtic 2016-02-19T12:05:56Z This is the final report for this grant to develop new three-dimensional wave propagation techniques for high frequency waves in heterogeneous media. The report is divided into four sections, each being a published paper sponsored by this grant. In the first section we formulate a one-way wide-angle elastic wave propagation method for arbitrarily heterogeneous media in both the space and wavenumber domains using elastic Rayleigh integrals and local elastic Born scattering theory. In the second section this complex phase screen method is compared with fourth-order finite differences and exact eigenfunction expansion calculations for two-dimensional inhomogeneous media to assess the accuracy of the one-way propagation algorithm. In the third section, an observational study of continental margin structure influence on Lg propagation is presented, using data from the former Soviet stations for nuclear explosions at Novaya Zemlya. We find that bathymetric features can be correlated with energy levels of Lg, suggesting that waveguide structure influences regional phase energy partitioning. This idea is pursued in the fourth section, using Eurasian earthquake and nuclear explosion data along with information about the crustal structure in Eurasia. We develop empirical relations that reduce the scatter in the P/Lg discriminant at low frequency. (MM) Text Novaya Zemlya Defense Technical Information Center: DTIC Technical Reports database Raleigh ENVELOPE(-55.731,-55.731,51.567,51.567) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Seismology Nuclear Weapons *SEISMIC WAVES *NUCLEAR EXPLOSION DETECTION *EARTHQUAKES USSR SCATTERING HIGH FREQUENCY ACOUSTIC WAVES WAVEGUIDES SEISMIC DETECTION THREE DIMENSIONAL WAVE PROPAGATION EARTH CRUST SEDIMENTS EURASIA PRIMARY WAVES(SEISMIC WAVES) ELASTIC WAVES SECONDARY WAVES BORN APPROXIMATIONS RALEIGH WAVES |
spellingShingle |
Seismology Nuclear Weapons *SEISMIC WAVES *NUCLEAR EXPLOSION DETECTION *EARTHQUAKES USSR SCATTERING HIGH FREQUENCY ACOUSTIC WAVES WAVEGUIDES SEISMIC DETECTION THREE DIMENSIONAL WAVE PROPAGATION EARTH CRUST SEDIMENTS EURASIA PRIMARY WAVES(SEISMIC WAVES) ELASTIC WAVES SECONDARY WAVES BORN APPROXIMATIONS RALEIGH WAVES Lay, Thorne Wu, Ru-Shan Analysis of 3D Complex Structure and Heterogeneity Effects on Formation and Propagation of Regional Phases in Eurasia. |
topic_facet |
Seismology Nuclear Weapons *SEISMIC WAVES *NUCLEAR EXPLOSION DETECTION *EARTHQUAKES USSR SCATTERING HIGH FREQUENCY ACOUSTIC WAVES WAVEGUIDES SEISMIC DETECTION THREE DIMENSIONAL WAVE PROPAGATION EARTH CRUST SEDIMENTS EURASIA PRIMARY WAVES(SEISMIC WAVES) ELASTIC WAVES SECONDARY WAVES BORN APPROXIMATIONS RALEIGH WAVES |
description |
This is the final report for this grant to develop new three-dimensional wave propagation techniques for high frequency waves in heterogeneous media. The report is divided into four sections, each being a published paper sponsored by this grant. In the first section we formulate a one-way wide-angle elastic wave propagation method for arbitrarily heterogeneous media in both the space and wavenumber domains using elastic Rayleigh integrals and local elastic Born scattering theory. In the second section this complex phase screen method is compared with fourth-order finite differences and exact eigenfunction expansion calculations for two-dimensional inhomogeneous media to assess the accuracy of the one-way propagation algorithm. In the third section, an observational study of continental margin structure influence on Lg propagation is presented, using data from the former Soviet stations for nuclear explosions at Novaya Zemlya. We find that bathymetric features can be correlated with energy levels of Lg, suggesting that waveguide structure influences regional phase energy partitioning. This idea is pursued in the fourth section, using Eurasian earthquake and nuclear explosion data along with information about the crustal structure in Eurasia. We develop empirical relations that reduce the scatter in the P/Lg discriminant at low frequency. (MM) |
author2 |
CALIFORNIA UNIV SANTA CRUZ INST OF TECTONICS |
format |
Text |
author |
Lay, Thorne Wu, Ru-Shan |
author_facet |
Lay, Thorne Wu, Ru-Shan |
author_sort |
Lay, Thorne |
title |
Analysis of 3D Complex Structure and Heterogeneity Effects on Formation and Propagation of Regional Phases in Eurasia. |
title_short |
Analysis of 3D Complex Structure and Heterogeneity Effects on Formation and Propagation of Regional Phases in Eurasia. |
title_full |
Analysis of 3D Complex Structure and Heterogeneity Effects on Formation and Propagation of Regional Phases in Eurasia. |
title_fullStr |
Analysis of 3D Complex Structure and Heterogeneity Effects on Formation and Propagation of Regional Phases in Eurasia. |
title_full_unstemmed |
Analysis of 3D Complex Structure and Heterogeneity Effects on Formation and Propagation of Regional Phases in Eurasia. |
title_sort |
analysis of 3d complex structure and heterogeneity effects on formation and propagation of regional phases in eurasia. |
publishDate |
1994 |
url |
http://www.dtic.mil/docs/citations/ADA291214 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA291214 |
long_lat |
ENVELOPE(-55.731,-55.731,51.567,51.567) |
geographic |
Raleigh |
geographic_facet |
Raleigh |
genre |
Novaya Zemlya |
genre_facet |
Novaya Zemlya |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA291214 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766151608323801088 |