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

Technical Report · Mon Aug 08 04:00:00 EDT 1983

OSTI ID:5739078

Owens, T J; Taylor, S R; Zandt, G

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.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5739078
• Report Number(s): UCID-19859; ON: DE83016391
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580201* -- Geophysics-- Seismology & Tectonics-- (1980-1989)
DATA
DATA ANALYSIS
EARTH CRUST
EARTH MANTLE
EXPERIMENTAL DATA
FEDERAL REGION II
FEDERAL REGION IV
FEDERAL REGION VIII
GEOGRAPHICAL VARIATIONS
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
INFORMATION
MEASURING INSTRUMENTS
NEW YORK
NORTH AMERICA
NUMERICAL DATA
SEISMIC ARRAYS
SEISMIC DETECTORS
SEISMIC P WAVES
SEISMIC WAVES
SEISMOGRAPHS
SOUTH DAKOTA
TENNESSEE
USA
VARIATIONS