The desirability of installing seismic instruments on and near major dams is explained. Two types of instruments are required: (1) Strong-motion acceleragraphs for recording potentially destructive ground shaking and resulting dam vibrations; and (2) sensitive seismographs for determining the local seismicity. A minimum of two strong-motion accelerographs should be installed on the dam and a minimum of two should be installed in the immediate vicinity of the dam. Each accelerograph should record three components of motion, should have a natural frequency of approx. 20 Hz, a recording speed of approx 1 cm/s. The sensitive seismographs are intended to record the local seismicity in the vicinity of the dam site before construction, and to detect any changes in seismicity during reservoir filling. A minimum of three seismographs is recommended for installation in the vicinity of the dam site. A vertical-component seismometer (1 Hz - 5 Hz) with visual recorder and approx 10,000 magnification at 1 Hz is recommended. /ASCE/

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Filing Info

  • Accession Number: 00131535
  • Record Type: Publication
  • Report/Paper Numbers: ASCE #11697 Proceeding
  • Files: TRIS
  • Created Date: May 14 1976 12:00AM