HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (13) Citing Articles via Google Scholar Google Scholar Articles by Morozov, I. B. Articles by Smithson, S. B. Search for Related Content GeoRef GeoRef Citation

Coda of Long-Range Arrivals from Nuclear Explosions

Department of Geology and Geophysics
Rice University
MS-126, 6100 South Main Street
Houston, Texas, 77005-1892
morozov{at}geophysics.rice.edu
(I. B. M.)

Department of Geology and Geophysics
University of Wyoming
PO Box 3006
Laramie, Wyoming 82071-3006
(I. B. M., S. B. S.)

Short-period, three-component recordings from peaceful nuclear explosions (PNE) of the profile QUARTZ, located in Russia, are used to constrain the nature of the coda of PNE arrivals. In particular, we examine the unusually strong and extensive coda of the long-range P_n (interpreted as a whispering-gallery, WG) phase propagating to beyond 3000 km. Energy-balance considerations in three dimensions show that such an extensive coda is inherent not only to WG but to all other P-wave phases and can be explained by crustal scattering. The long coda is a result of excitation of short-period scattered waves (Pg, Sg, Lg, Rg) within the crust by the waves incident from the mantle, or, conversely, by generation of mantle phases from crustal guided waves within the source region. The resulting estimates of coda Q range between Q = 380 near 2 Hz and Q = 430 near 5 Hz and can be associated with crustal attenuation including the sediments. Our coda model also explains quantitatively the observed build-up of the arrival amplitude with time and the apparent lack of a pronounced coda of the body-wave arrivals from the mantle transition zone. These effects result from adding up the energy of the later arrivals arriving during the codas of earlier arrivals. We "deconvolve" the overlapping coda patterns and show that the true relative energies of the arrivals are significantly lower than the apparent energies measured from the raw records. A whispering-gallery interpretation of the long-range P_n and crustal scattering accounts for the entire range of observations of kinematic, spectral, and amplitude pattern of the PNE wavefield and allows the derivation of constraints on attenuation.

This article has been cited by other articles:

				J. Xie Pn Attenuation beneath the Tibetan Plateau Bulletin of the Seismological Society of America, December 1, 2007; 97(6): 2040 - 2052. [Abstract] [Full Text] [PDF]

				I. B. Morozov, E. A. Morozova, S. B. Smithson, P. G. Richards, V. I. Khalturin, and L. N. Solodilov 3D First-Arrival Regional Calibration Model of Northern Eurasia Bulletin of the Seismological Society of America, June 1, 2005; 95(3): 951 - 964. [Abstract] [Full Text] [PDF]

				Imaging Crustal Structure along Refraction Profiles Using Multicomponent Recordings of First-Arrival Coda Bulletin of the Seismological Society of America, December 1, 2002; 92(8): 3080 - 3086.