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5Šª
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1978”N
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169-176•Å
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PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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Hajime TSUCHIDA, Susumu IAI
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OBSERVATION OF EARTHQUAKE RESPONSE OF GROUND WITH HORIZONTAL AND VERTICAL SEISMOMETER ARRAYS (2ND REPORT)
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A two dimensional accelerometer array has been operated. Six accelerometers of two horizontal components are located every 500 meters along a straight line on the ground surface. Two downhole accelerometers of three components are located at two points of which horizontal distance is 2000 meters. Depths of the downhole accelerometer locations are about 67 and 50 meters. Three records from the array were selected and used to study the seismic wave propagation in the surface layer. Frequency response functions were calculated for many combinations of two accelerometer points. It was found that the multiple reflection of shear waves in the vertical direction in the surface layer is not contradictory to the results of the analysis.
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