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  • ソウカンホウ ニ ヨル ビドウ ノ トウライ ホウコウ ニ ツイテ

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抄録

The correlation method to study the direction of arrival of microseisms using a three-component,single-station seismograph at the Kakkonda geothermal area, Iwate prefecture, is discussed.Considering the fact that an ideal Rayleigh wave will be characterized by particle motions with a phase difference of 90° between the horizontal and vertical components and with either 0° or 180°phase　difference between the two horizontal components, the direction of arrival is determined by the relative amplitude of the cross-correlations among two horizontal components and vertical one. The cross-correlations are evaluated for the selected frequencies 7Hz and 12Hz through band pass filter,which indicate the high peaks in the power spectra. Moreover the direction of arrival is also determined for such filtered waves by the particle motion method. The results of arrival direction at 7 Hz in the Camp and D-point observation stations show a special quardrant in each observation station, while the waves at 12Hz in both stations come from all directions. These results in dicate that the correlation method using a band pass filter reliably determines the direction of arrival of microseisms in the geothermalarea. It is therefore possible to assess,at least approximately, the direction of the area in which geothermal microseisms are being generated,provided that useful informations on microseisms can be obtained by studies of simultaneous records at a large number of stations.

収録刊行物

  • 物理探査

    物理探査 40 (4), 250-263, 1987-01-01

    社団法人物理探査学会

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