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Wayne A. Woodward, Henry L. Gray, Indra Gupta, and James R. Haney
Use of time-deformation methods to discriminate between earthquakes and explosions on the basis of Lg alone
Bulletin of the Seismological Society of America (August 2007), 97(4):1196-1203
Abstract: Index Terms/Descriptors: Latitude & Longitude:
GeoRef, Copyright 2007, American Geological Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
In this article we introduce the use of time-transformation methods for analyzing signals with time-varying frequencies. We show that these techniques can be usefully applied to the Lg waves of earthquakes and explosions for purposes of deriving discriminants based on the Lg wave alone. Preliminary examination of the Lg waves from 10 earthquakes and 10 explosions recorded at the Mina, Nevada (MNV), station shows that frequencies are varying (decreasing) more systematically with time for explosions than for earthquakes. Use of a proposed discriminant produced excellent discrimination between the earthquakes and explosions analyzed.
algorithms; case studies; discriminant analysis; earthquakes; elastic waves; explosions; guided waves; Lg-waves; Mina Nevada; Mineral County Nevada; Nevada; seismic sources; seismic waves; seismicity; statistical analysis; surface waves; United States
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