A strong motion database for the chiba seismometer array and its engineering analysis

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Abstract
A three‐dimensional seismometer array was installed in the Chiba Experiment Station of the Institute of Industrial Science, University of Tokyo in 1982. The array system consists of 44 three‐component accelerometers densely placed both on the ground surface and in boreholes. A complementary system for the measurement of ground and buried pipe strains was also installed at the same site. The array system has been successfully in operation, and more than 160 earthquakes have been recorded. Considering a wide use of these seismograms, the Chiba array database has recently been created comprising twenty‐seven major events. This paper describes the Chiba array system and its strong motion database. Results of engineering analysis using the selected records are also presented.

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