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Regional source discrimination of small events on the use of Lg wavetrain

Indra N. Gupta, Winston W. Chan and Robert A. Wagner
Regional source discrimination of small events on the use of Lg wavetrain
Bulletin of the Seismological Society of America (February 2005) 95 (1): 341-346

Abstract

Nuclear monitoring requires identification of small events observed at regional distances for which Lg is generally the largest seismic phase. Recent research, including ours, has provided significantly better understanding of the generation of Lg from explosions, but the new concepts have not yet been fully exploited for improving discrimination between low magnitude explosions and earthquakes in different regions of the world. Our analysis of spectrograms, which display spectral energy versus time, shows that Lg from explosions alone is generally followed by several distinct arrivals with progressively lower frequency contents, probably due to the scattering of explosion-generated Rg into S at several discrete near-source locations. This promising new discriminant may offer a distinct advantage over other seismic methods of discrimination, since it may not require the region of interest to be calibrated with the help of earlier known-type seismic events. Moreover, regional discrimination based on the Lg wavetrain can be especially useful when signal-to-noise considerations for a small event preclude the use of other seismic phases.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 95
Serial Issue: 1
Title: Regional source discrimination of small events on the use of Lg wavetrain
Affiliation: Multimax, Largo, MD, United States
Pages: 341-346
Published: 200502
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 11
Accession Number: 2005-038794
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N20°00'00" - N53°00'00", E74°00'00" - E135°00'00"
N07°00'00" - N37°00'00", E68°00'00" - E97°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200523
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