Rapid Moment Tensor Inversion of Earthquakes near Japan for Tsunami Warning: Numerical Experiments

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  • 津波予測のための日本近海地震のモーメントテンソル即時決定: 数値実験
  • ツナミ ヨソク ノ タメ ノ ニホン キンカイ ジシン ノ モーメント テンソ

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Abstract

The possibility of moment tensor inversion for rapid prediction of tsunami height is studied. Numerical experiments of the inversion are made on a hypothetical network of digital seismograms with a very broad band and wide dynamic range. Using the normal mode theory, we invert waveforms with a duration of 3 minutes after the earthquake origin time. The experiments suggest that the rapid determination of seismic moment and source mechanism may be possible for earthquakes near Japan, if we can gather the data by a real time on-line system from several Japanese stations. The assumption of the point source in our inversion method may become invalid for great earthquakes. To estimate the effect of the source finiteness, we invert seismograms calculated for moving sources and find that the obtained scalar moment is underestimated to be half the true one for a fault length of 200km. Further studies on the inversion for finite sources are required to achieve a practical estimation of tsunami height.

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