Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by OWENS, T. J. Articles by ZANDT, G. Search for Related Content GeoRef GeoRef Citation

Crustal structure at Regional Seismic Test Network stations determined from inversion of broadband teleseismic P waveforms

EARTH SCIENCE DIVISION LAWRENCE LIVERMORE NATIONAL LABORATORY, LIVERMORE, CALIFORNIA 94550

Abstract

The site structure beneath the five broadband stations of the Regional Seismic Test Network (RSTN) has been determined utilizing teleseismic P waveforms. Our teleseismic waveform modeling technique involves inverting the radial component of stacked source-equalized receiver functions in the time domain to estimate the vertical shear velocity structure at the site. The receiver functions at RSNY (Adirondacks, New York), RSON (Red Lake, Ontario), and RSNT (Yellowknife, Northwest Territory) are quite simple compared to previously published RSCP (Cumberland Plateau, Tennessee) data, largely due to the absence of sedimentary surface rocks at these sites. At RSNY, a high-velocity layer at mid-crustal depths (18 to 26 km) in our southeast backazimuth results correlates in depth with a zone of high-amplitude reflections found on COCORP profiles 60 km south of RSNY. A gradational crust-mantle boundary is observed at RSCP and RSNY. The RSON and RSNT sites are characterized by simple crusts with fairly abrupt crust-mantle boundaries. The crust beneath RSON appears to have a clear division between the upper and lower crust at about 18 km depth while this boundary is not well-developed at RSNT. Pronounced azimuthal variations in crustal structure at RSSD (Black Hills, South Dakota) prohibit the determination of velocity using a layered earth model. The crustal thicknesses at each of these sites are: RSCP, 40 to 50 km; RSSD, 47 to 50 km; RSNY, 45 to 50 km; RSNT, 38 km; and RSON, 42 km.

Footnotes

^* Present address: Department of Geology, University of Missouri, Columbia, Missouri 65211.

This article has been cited by other articles:

				X.-Q. Li and J. L. Nabelek Deconvolution of teleseismic body waves for enhancing structure beneath a seismometer array Bulletin of the Seismological Society of America, February 1, 1999; 89(1): 190 - 201. [Abstract] [PDF]

				A. L. Lerner-Lam, A. Sheehan, S. Grand, E. Humphreys, K. Dueker, E. Hessler, H. Guo, D.-K. Lee, and M. Savage Deep structure beneath the Southern Rocky Mountains from the Rocky Mountain Front Broadband Seismic Experiment Rocky Mountain Geology, October 1, 1998; 33(2): 199 - 216. [Abstract] [Full Text] [PDF]

				J. Zhang and C. A. Langston Dipping structure under Dourbes, Belgium, determined by receiver function modeling and inversion Bulletin of the Seismological Society of America, February 1, 1995; 85(1): 254 - 268. [Abstract] [PDF]

				F. Kruger Sediment structure at GRF from polarization analysis of P waves of nuclear explosions Bulletin of the Seismological Society of America, February 1, 1994; 84(1): 149 - 170. [Abstract] [PDF]

				S. G. MANGINO, G. ZANDT, and C. J. AMMON The receiver structure beneath Mina, Nevada Bulletin of the Seismological Society of America, April 1, 1993; 83(2): 542 - 560. [Abstract] [PDF]

				J. F. CASSIDY Numerical experiments in broadband receiver function analysis Bulletin of the Seismological Society of America, June 1, 1992; 82(3): 1453 - 1474. [Abstract] [PDF]

				C. J. AMMON The isolation of receiver effects from teleseismic P waveforms Bulletin of the Seismological Society of America, December 1, 1991; 81(6): 2504 - 2510. [PDF]

				M. C. WALCK and E. P. CHAEL Optimal backazimuth estimation for three-component recordings of regional seismic events Bulletin of the Seismological Society of America, April 1, 1991; 81(2): 643 - 666. [Abstract] [PDF]

				T. J. OWENS, R. S. CROSSON, and M. A. HENDRICKSON Constraints on the subduction geometry beneath western Washington from broadband teleseismic waveform modeling Bulletin of the Seismological Society of America, June 1, 1988; 78(3): 1319 - 1334. [Abstract] [PDF]

				T. J. OWENS and R. S. CROSSON Shallow structure effects on broadband teleseismic P waveforms Bulletin of the Seismological Society of America, February 1, 1988; 78(1): 96 - 108. [Abstract] [PDF]