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Identification Criteria for Sources of T Waves Recorded in French Polynesia

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Monitoring the Comprehensive Nuclear-Test-Ban Treaty: Hydroacoustics

Part of the book series: Pageoph Topical Volumes ((PTV))

Abstract

From a data set of 150 digital records of Tphases from 71 sources obtained on seismometers of the Polynesian Seismic Network, we define a discriminant separating earthquake and explosion sources, which uses the maximum amplitude of recorded ground velocity, measured on its envelope, eMax(in µm/s), and the duration of the phase measured at 1/3 of maximum amplitude, τ1/3 (in seconds). Earthquake sources and man-made explosions are effectively separated in a log-log space by the straight line

$${\log _{10}}{e_{Max}} = 4.9{\log _{10}}{\tau _{1/3}} - 4.1 .$$

Other criteria in both the time and frequency domains fail to reliably separate the populations of the various kinds of events. The application of this technique to analog records of large-scale man-made explosions carried out in the 1960s confirms that it provides an adequate discriminant over 3.5 orders of magnitude of ground velocity.

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Authors and Affiliations

  1. Département Analyse et Surveillance de l’Environnement, Commissariat à l’Energie Atomique Boîte, Postale 12, 91680, Bruyères-le-Châtel, France

    Jacques Talandier

  2. Department of Geological Sciences, Northwestern University, Evanston, IL, 60201, USA

    Emile A. Okal

Authors
  1. Jacques Talandier
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  2. Emile A. Okal
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Editors and Affiliations

  1. Scripps Institution of Oceanography, La Jolla, CA, 92093-0225, USA

    Catherine deGroot-Hedlin  & John Orcutt  & 

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© 2001 Springer Basel AG

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Talandier, J., Okal, E.A. (2001). Identification Criteria for Sources of T Waves Recorded in French Polynesia. In: deGroot-Hedlin, C., Orcutt, J. (eds) Monitoring the Comprehensive Nuclear-Test-Ban Treaty: Hydroacoustics. Pageoph Topical Volumes. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-8270-5_7

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  • DOI: https://doi.org/10.1007/978-3-0348-8270-5_7

  • Publisher Name: Birkhäuser, Basel

  • Print ISBN: 978-3-7643-6538-7

  • Online ISBN: 978-3-0348-8270-5

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