Four years of automated measurements of seismic moments at Papeete using the mantle magnitude Mm: 1987-1991

Olivier Hyvernaud, Dominique Reymond, Jacques Talandier, Emile A. Okal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We report on a 4-year experiment of routine automatic determination of seismic moments using the mantle magnitude Mm. We have developed a system performing automatic detection and location of distant earthquakes, on the basis of three-component broadband records at a single seismic station. This system, which has been operational since 1987 at Papeete, Tahiti, computes Mm from the spectral amplitude of the mantle Rayleigh waves. Based on a dataset of 474 earthquakes, we show that Mm provides a excellent estimate of the quantity log10M0 - 20, where M0 is the seismic moment in dyn-cm, as published subsequently by the Harvard and USGS groups. The average residual is 0.07 units of magnitude, and the standard deviation 0.22 units. This method, which necessitates minimal hardware, has powerful applications in the field of tsunami warning.

Original languageEnglish (US)
Pages (from-to)175-193
Number of pages19
JournalTectonophysics
Volume217
Issue number3-4
DOIs
StatePublished - Jan 30 1993

ASJC Scopus subject areas

  • Geophysics
  • Earth-Surface Processes

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