Rediscovering Signal Complexity as a Teleseismic Discriminant

Journal Article · Fri Feb 20 04:00:00 EST 2009 · Pure and Applied Geophysics

DOI:https://doi.org/10.1007/s00024-008-0449-y· OSTI ID:953369

Taylor, Steve R. ^[1]; Anderson, Dale N. ^[2]

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1. Rocky Mountain Geophysics, Los Alamos, NM (United States)
2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We re-examine the utility of teleseismic seismic complexity discriminants in a multivariate setting using United Kingdom array data. We measure a complexity discriminant taken on array beams by simply taking the logarithm of the ratio of the P wave coda signal to that of the first arriving direct P wave (βCF). The single station complexity discriminant shows marginal performance with shallow earthquakes having more complex signatures than those from explosions or deep earthquakes. However, when combined with the mb – Ms discriminant significant improvements are observed. In particular, signal complexity can be used to improve discrimination performance over mb – Ms alone as well improve differentiation between shallow and deep earthquakes. When complexity discriminants are combined with mb – Ms there is a tendency for explosions, shallow earthquakes and deep earthquakes to form three distinct populations. Importantly, multistation complexity discriminants have false alarm rates similar to those observed for network mb - Ms in support of predictions based on simulations of Bowers (1996).

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 953369
• Report Number(s): PNNL-SA--61807; NN2003000
• Journal Information: Pure and Applied Geophysics, Journal Name: Pure and Applied Geophysics Journal Issue: 3 Vol. 166; ISSN PAGYAV; ISSN 0033-4553
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
DATA ANALYSIS
EARTHQUAKES
EXPLOSIONS
PERFORMANCE
SEISMIC P WAVES
SEISMIC SURVEYS
UNITED KINGDOM