Seismic Noise Measurements in the Takinoue(Kakkonda)Geothermal Area(6). Direction of Arrival and Apparent Phase Velocity of Seismic Noise by the Tripartite Observation.:Direction of Arrival and Apparent Phase Velocity of Seismic Noise by the Tripartite Ob
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概要
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Measurements of seismic noise by tripartite arrays of three vertical seismometers were carried out at three observation sites in the Kakkonda geothermal area, Iwate Prefecture, in 1983 and 1986.Conclusions are summarized as follows :(1) No diurnal and secular variations of arrival diretion for seismic noise in the Kakkonda geothermal area are observed.(2) Arrival directions obtained near the steam supply system change before and after the closure of wellhead valves of geothermal production wells.(3) Seismic noise in the band 3 to 7 Hz is arriving from the direction of the geothermal reservoir.(4) Apparent phase velocities for the 1 to 10 Hz seismic noise field show the dispersive characteristics of Rayleigh wave.
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