深発地震の走時偏椅について

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書誌事項

タイトル別名
  • The Anomalies of Incident Time of P-Waves of Deep Earthquakes in Japan
  • （地震波による地殼構造の研究 その3）

抄録

This is the 3rd paper on the study of the structure of the earth crust of Japan. In this paper, the author discussed the anomalies of incident times of P-waves from deepfocus earthquakes. Using the travel time curves of 41 remarkable deep earthquakes occurred in 1935-4953 (their epicenters are plotted in Figure 1), the mean values of the deviations from the normal curves at easy observations (ΔTobs.) are obtained. Corresponding with these observed anomalies, the values of the expected anomalies (ΔTcal.) from the author's model for the structure of the crust of Japan are calculated. The values of this two sorts of anomalies, observed and calculated, are shown in Table 1. The geographical distributions of the anomalies are shown in Figure 2 and 3. Comparing with two maps, we can find that the distributions of ΔTobs. agree well with that of ΔTcal. Figure 4 is the scatter diagram for those two sorts of values. The figure indicates that there is the linear colleration between two values. In consequence, the author assert that the observed deviations of the incident time of deep focus earthquakes are caused by the irregularities of the structure of upper crust, and especially, the large parts of the values of them are to be explained by the author's model for the crust of Japan.

収録刊行物

  • 地震　第２輯

    地震　第２輯 8 (1), 48-54, 1955

    公益社団法人 日本地震学会

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