One-station estimates of seismic moments from the mantle magnitude Mm: The case of the regional field (1.5°≤Δ≤15°)

Jacques Talandier*, Emile A. Okal

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

We extend to the regional field of distances the procedure of one-station estimation of seismic moments using the mantle magnitude Mm, as introduced earlier in the case of teleseismic events. A theoretical analysis of the validity of the asymptotic expansion of normal modes in terms of surface waves, which was used in the development of Mm, upholds the validity of the algorithm for distances as short as 1.5°. This is confirmed by the analysis of a dataset of 149 GEOSCOPE records obtained at distances ranging from 1.5 to 15°, from earthquakes with moments between 1024 and 2.5×1027 dyn-cm. The performance of Mm as measured in terms of average residual with respect to published values of M0, and standard deviation of the residuals, is not degraded in this distance range, with respect to the teleseismic case. This indicates that the mantle magnitude Mmcan be reliably used at regional distances, notably for tsunami warning applications.

Original languageEnglish (US)
Pages (from-to)43-60
Number of pages18
JournalPure and Applied Geophysics PAGEOPH
Volume138
Issue number1
DOIs
StatePublished - Jan 1 1992

Keywords

  • Mantle magnitude
  • regional field
  • tsunami warning

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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