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Date:     Wed, 23 May 2001 17:29:55 PDT
From: "Simon L Klemperer"  <EN.FOL@Forsythe.Stanford.EDU>
To: jon@farne.stanford.edu
Subject:  GeoRef. display (Find AUTHOR-PH WALLACE T not ABS-ONLY ABS...)

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GeoRef. / Search: Find AUTHOR-PH WALLACE T not ABS-ONLY ABS
Result: 86 citations

Citation 9 --------------------------------------------------------------------
TITLE:          Regional phase development of the non-proliferation experiment
                  within the Western United States
AUTHOR:         Tinker, Mark Andrew; University of Arizona, Department of
                  Geosciences, Tucson, AZ
PUBLICATION:    Bulletin of the Seismological Society of America, Berkeley, CA
                  : Seismological Society of America, Apr. 1997, 0037-1106,
                  BSSAAP, Vol. 87, no. 2, illus., incl. sketch map
                p. 383-395
LOCATION:       Stanford
                for Seismological Society of America. Bulletin of the
                    Seismological Society of America.
                  Earth Sciences 91 (Library has 1, 1911- .863. 1)
                for Seismological Society of America. Eastern Section. Bulletin
                    of the Seismological Society of America.
                  Earth Sciences Biblio & Indexes 551.1 .S45 F (Library has
                    1-2, 1926-27; [3, 1928])
LANGUAGE:       eng
ABSTRACT:       To effectively monitor a Comprehensive Test Ban Treaty,
                  seismologists must be able to confidently detect and identify
                  low-yield explosions. This requires the use of short-period
                  regional phases, which can be extremely complicated. The
                  Non-Proliferation Experiment (NPE) was a low-yield chemical
                  explosion detonated at the Nevada Test Site (NTS) and
                  recorded at more than 50 broadband seismic stations located
                  throughout the western United States. These data were used to
                  investigate the development of Lg and Pn, two seismic phases
                  used in regional discriminants. The frequency-dependent
                  attenuation for Lg recorded at 43 stations is described by
                  the relation Q (sub Lg) (vertical) = 238 f (super 1.28) . The
                  amplitude decay for Pn recorded at 38 stations is
                  proportional to Delta (super -(1.29+0.05f)) for the frequency
                  window of 1 to 6 Hz. After removing the effects of distance
                  and attenuation, we found the values of the spectral ratio Lg
                  (4-6)/(2-4) to group according to the geologic terrain
                  associated with the path traveled. Stations located within
                  the Basin and Range had lower ratio values than stations
                  located outside the Basin and Range. However, for the
                  spectral ratio Pn (2-4)/(4-6), geologic terrain had an
                  indirect effect. Pn is affected by Moho structure associated
                  with the backazimuth, causing an azimuthal dependence. Of
                  course, Moho structure can be a function of geologic terrain.
                  Furthermore, the Pn arrival may be large or small,
                  independent of azimuth. The values of the discriminant phase
                  ratio Pn (1-2)/Lg (2-4) have an order of magnitude more
                  scatter than Lg/Lg or Pn/Pn. Nonetheless, the values are both
                  a function of geologic terrain (the Lg contribution) as well
                  as Moho structure (Pn contribution).
THESAURUS:      Amplitude; Attenuation; Elastic waves; Explosions;
                  Interpretation; Mohorovicic discontinuity; Nuclear explosions
;                 Seismic sources; Seismicity; Velocity structure
                Basin and Range Province; Nevada; Nevada Test Site;
                  North America; United States
SUBJECT CODES:  19 Geophysics, Seismology
MORE ENTRIES:   Wallace, Terry C.
NOTES:          Coordinates: W1170500 W1152000 N375200 N363500
                GeoRefID: 9758924