Deep Earthquakes in the Fiji Region

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Other Title
  • フイージーの深発地震
  • フィージ ノ シンパツ ジシン シンパツ ジシン ノ セイシツ ニ ツイテ エイブン
  • On the Nature of Deep Earthquakes
  • 深発地震の性質について

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Description

The Fiji region in the southwest Pacific Ocean is the most active source of deep earthquakes. U. S. C. G. S. registered 141 deep earthquakes of more than 300 km in depth in the Fiji region in a period from July,1959 to March,1961, and a short period vertical seismograph at the Matsushiro Seismological Observatory, which is about 70 degrees away from the region, surprisingly well recorded these earthquakes, namely,112 out of 141. Predominant period, spectral structure, dependence of period on magnitude, appearance of seismogram of the initial part of P wave, and frequency of occurrence of these earthquakes are investigated in comparison with the shallow earthquakes in the adjacent regions.<BR>The nature of deep earthquakes is likely to be different from that of shallow earthquakes. The results of the present investigation are itemized in section 5, “ Conclusion ”.

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