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Title: Crustal structure beneath RSTN stations inferred from teleseismic P-waveforms: preliminary results at RSCP, RSSD, and RSNY

Abstract

We have modeled teleseismic P-waveforms recorded at three Regional Seismic Test Network (RSTN) stations (RSCP, Cumberland Plateau Observatory, TN; RSSD, Black Hills, SD; RSNY, Adirondack Mtns, NY) to determine local crustal structures. After source effects are removed by deconvolution, seismograms from events clustered in both distance and back azimuth were stacked to enhance the signal and improve confidence in interpreting converted phases at each station. Preliminary analysis indicates that seismograms from RSCP and RSNY generally exhibit less well-developed converted and reflected phases from the crust-mantle boundary than are observed at RSSD and LLNL broadband station ELK (Elko, NV). These differences are likely due to a gradational crust-mantle boundary in the eastern United States. Comparisons of seismograms recorded at the RSTN stations indicate that the waveforms at RSSD and RSCP are much more complex than waveforms from RSNY. This complexity is largely due to low-velocity sedimentary layers at the RSSD and RSCP sites, whereas RSNY is located directly on crystalline basement. At RSCP, we find a crustal thickness of 41 km, which agrees with early refraction profiles in the area. Our data require a 10 km thick transition zone between the crust and upper mantle beneath RSCP. The crustal thickness determinedmore » at RSSD is 47 to 50 km. 14 references, 10 figures, 1 table.« less

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
OSTI Identifier:
5739078
Report Number(s):
UCID-19859
ON: DE83016391
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; EARTH CRUST; GEOLOGIC STRUCTURES; SEISMIC P WAVES; GEOGRAPHICAL VARIATIONS; DATA ANALYSIS; EARTH MANTLE; EXPERIMENTAL DATA; GEOLOGIC MODELS; NEW YORK; SEISMOGRAPHS; SOUTH DAKOTA; TENNESSEE; DATA; FEDERAL REGION II; FEDERAL REGION IV; FEDERAL REGION VIII; INFORMATION; MEASURING INSTRUMENTS; NORTH AMERICA; NUMERICAL DATA; SEISMIC ARRAYS; SEISMIC DETECTORS; SEISMIC WAVES; USA; VARIATIONS; 580201* - Geophysics- Seismology & Tectonics- (1980-1989)

Citation Formats

Owens, T J, Taylor, S R, and Zandt, G. Crustal structure beneath RSTN stations inferred from teleseismic P-waveforms: preliminary results at RSCP, RSSD, and RSNY. United States: N. p., 1983. Web.
Owens, T J, Taylor, S R, & Zandt, G. Crustal structure beneath RSTN stations inferred from teleseismic P-waveforms: preliminary results at RSCP, RSSD, and RSNY. United States.
Owens, T J, Taylor, S R, and Zandt, G. 1983. "Crustal structure beneath RSTN stations inferred from teleseismic P-waveforms: preliminary results at RSCP, RSSD, and RSNY". United States.
@article{osti_5739078,
title = {Crustal structure beneath RSTN stations inferred from teleseismic P-waveforms: preliminary results at RSCP, RSSD, and RSNY},
author = {Owens, T J and Taylor, S R and Zandt, G},
abstractNote = {We have modeled teleseismic P-waveforms recorded at three Regional Seismic Test Network (RSTN) stations (RSCP, Cumberland Plateau Observatory, TN; RSSD, Black Hills, SD; RSNY, Adirondack Mtns, NY) to determine local crustal structures. After source effects are removed by deconvolution, seismograms from events clustered in both distance and back azimuth were stacked to enhance the signal and improve confidence in interpreting converted phases at each station. Preliminary analysis indicates that seismograms from RSCP and RSNY generally exhibit less well-developed converted and reflected phases from the crust-mantle boundary than are observed at RSSD and LLNL broadband station ELK (Elko, NV). These differences are likely due to a gradational crust-mantle boundary in the eastern United States. Comparisons of seismograms recorded at the RSTN stations indicate that the waveforms at RSSD and RSCP are much more complex than waveforms from RSNY. This complexity is largely due to low-velocity sedimentary layers at the RSSD and RSCP sites, whereas RSNY is located directly on crystalline basement. At RSCP, we find a crustal thickness of 41 km, which agrees with early refraction profiles in the area. Our data require a 10 km thick transition zone between the crust and upper mantle beneath RSCP. The crustal thickness determined at RSSD is 47 to 50 km. 14 references, 10 figures, 1 table.},
doi = {},
url = {https://www.osti.gov/biblio/5739078}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 08 00:00:00 EDT 1983},
month = {Mon Aug 08 00:00:00 EDT 1983}
}

Technical Report:
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