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1975”N
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137-144•Å
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PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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Hajime TSUCHIDA, Eiichi KURATA
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OBSERVATION OF EARTHQUAKE RESPONSE OF GROUND WITH HORIZONTAL AND VERTICAL SEISMOMETER ARRAYS
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A horizontal seismometer array having six observation points along a straight line of 2500 meter length have been established in the Tokyo International Airport. Each observation point is equipped with two horizontal seismometers. Downhole seismometer arrays have also been established at two points, one at an end of the observation line and the other at the point 500 meter inside from the other end of the line. The observation started in April 1974 and 28 earthquakes had been recorded as of June 1975. Correlations among the ground motions at the points on the ground surface and the two points in the ground where the downhole seismometers have been installed, are studied. The relative displacements between the points are also studied.
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