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Interpretation of body and Rayleigh waves from NTS to Tucson

Langston, Charles A. and Helmberger, Donald V. (1974) Interpretation of body and Rayleigh waves from NTS to Tucson. Bulletin of the Seismological Society of America, 64 (6). pp. 1919-1929. ISSN 0037-1106.

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A linear array of eight Caltech portable broad-band seismograph trailers was set out from NTS to near Phoenix, Arizona, for the pre-announced underground nuclear test, OSCURO, on September 21, 1972. Travel-time and amplitude information were used to find an average crustal model by calculating synthetic seismograms using the Cagniard-de Hoop method. Rayleigh waves from other nuclear events at NTS, as recorded at the Tucson WWSSN station, were examined as a control for determining the structure of the top half of the crust. Group-velocity curves were found and synthetic Rayleigh waves calculated for Tucson and Kingman (LRSM). The formations and characteristics of P_n, a reflected P_n, and the P_g phases are examined. P_g is demonstrated to be composed of the primary P reflection from the mantle and contains multiple arrivals of P—SV conversions. Comparisons of synthetic and observed seismograms indicate a crustal thickness of 30 km with a Poisson's ratio of 0.23. The crust-mantle transition appears to be sharp, jumping from 6.1 to 7.9 km/sec. The amplitude behavior of P_n shows little evidence of any lid structure.

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Additional Information:© 1974 Seismological Society of America. Manuscript received February 11, 1974. We thank David Harkrider for the use of his programs and advice. This research was supported by the Advanced Research Projects Agency at the Department of Defense and was monitored by the Air Force Office of Scientific Research under Contract F44620-72-C-0078.
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Advanced Research Projects Agency (ARPA)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)F44620-72-C-0078
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Caltech Division of Geological and Planetary Sciences2451
Issue or Number:6
Record Number:CaltechAUTHORS:20140919-131512193
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49862
Deposited By: Tony Diaz
Deposited On:19 Sep 2014 21:13
Last Modified:03 Oct 2019 07:17

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