Technical Research Report, Earthquake Research Institute, the University of Tokyo, No. +-, pp. 0 +3,,1. No ,1

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1 No ,**1 Technical Research Report, Earthquake Research Institute, the University of Tokyo, No. +-, pp. 0 +3,,**1. * Construction of the General Observation System for Strong Motion in Earthquake Research Institute Minoru SAKAUE* Abstract The general observation system for strong motion on three-type buildings in Earthquake Research Institute has been constructed. This system consists of twelve accelerometers and a multi-channel data logger. The construction of a new building of Earthquake Research Institute was started at the end of,**. fiscal year. The structure of the new building (Bldg. + ) was designed to be a seven-storied reinforced concrete building of pile foundation with seismic isolation system. Division of Disaster Mitigation Science of Earthquake Research Institute. proposed a basic plan of strong motion observation with settled accelerometers. The main feature of this observation plan is the settlement of accelerometers ; two in pile, one on the base of isolation system, two at the eastern and western ends of first floor, one at seventh floor, and one on the ground, for the purpose of verification to the seismic isolation system when earthquakes occur. The recorded seismic data are to be gathered by the highly e$ cient multi-channel data logger AJE- 2,** (MITUTOYO) placed at the room + /+, of bldg. + Three and two accelerometers were also settled in the old building (Bldgs.,, -) respectively. Key words : reinforced concrete building, seismic isolation system, strong motion observation, highly e$ cient multi-channel data logger + +,, +30/ +,** * , + /+, GPS : AJE-2,** +,**,,**.,,**0 - +, PFI *,**1. 1 +, - -, +,,**1 3 +-,**1 +*,. + +, -0 * * Technical Supporting Section for Observational Research, Earthquake Research Institute, the University of Tokyo. 6

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