Seismic Noise Measurements in the Takinoue (Kakkonda) Geothermal Area (5). On Direction of Arrival of Seismic Noise by the Cross-correlation Method.:On Direction of Arrival of Seismic Noise by the Cross-correlation Method

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We investigated the direction of arrival of seismic noise recorded at 65 observation points in the Kakkonda geothermal area, Iwate Prefecture, from 1983 to 1985. The cross-correlation method was adopted for the data processing in the frequency range of 3 to 11 Hz.<BR> The results obtained in the study are summarised as follows.<BR> 1) No diurnal and secular variations of arrival direction of seismic noise in the Kakkonda geothermal area are observed.<BR> 2) Arrival directions obtained near the steam supply system change before and after the closure of the wellhead valve of geothermal production wells.<BR> 3) Arrival directions for seismic noise in the frequency range of 3 to 8 Hz showing large Fourier amplitude except just above the geothermal reservoir are well consistent with the direction to the geothermal reservoir.
日本地熱学会の論文