An algorithm for automated tsunami warning in French Polynesia based on mantle magnitudes

J. Talandier, E. A. Okal

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

We have developed a new magnitude scale, Mm, based on the measurement of mantle Rayleigh-wave energy in the 50 to 300sec period range, and directly related to the seismic moment through Mm=log10M0 - 20. Measurements are taken on the first passage of Rayleigh waves, recorded on-scale on broadband instruments with adequate dynamical range. This allows estimation of the moment of an event within minutes of the arrival of the Rayleigh wave, and with a standard deviation of ±0.2 magnitude units. In turn, the knowledge of the seismic moment allows computation of an estimate of the high-seas amplitude of a range of expectable tsunami heights. The latter, combined with complementary data from T-wave duration and historical references, have been integrated into an automated procedure of tsunami warning by the Centre Polynesien de Prevention des Tsunamis (CPPT), in Papeete, Tahiti. -Authors

Original languageEnglish (US)
Pages (from-to)1177-1193
Number of pages17
JournalBulletin - Seismological Society of America
Volume79
Issue number4
StatePublished - Jan 1 1989

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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