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

LABORATOIRE DE GÉOPHYSIQUE COMMISSARIAT À L'ENERGIE ATOMIQUE AND CENTRE POLYNÉSIEN DE PRÉVENTION DES TSUNAMIS, BOÎTE POSTALE 640, PAPEETE, TAHITI, FRENCH POLYNESIA
DEPARTMENT OF GEOLOGICAL SCIENCES NORTHWESTERN UNIVERSITY, EVANSTON, ILLINOIS 60208

Abstract

We have developed a new magnitude scale, M_m, based on the measurement of mantle Rayleigh-wave energy in the 50 to 300 sec period range, and directly related to the seismic moment through M_m = 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 The latter, combined with complementary data from T-wave duration and historical references, have been integrated into an automated procedure of tsunami warning by the Centre Polynésien de Prévention des Tsunamis (CPPT), in Papeete, Tahiti.

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