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A PORTABLE SEISMOGRAPH.
GEOTECHNICAL CORP GARLAND TX
This paper briefly describes a portable seismograph system developed for use in the Long-Range Seismic Measurements Program of Project VELA-Uniform. The portable seismograph system was designed to fulfill the requirement for a reliable system that can be moved to the field, set up quickly, and allowed to run for up to 7 days without attention. All of the major components, except the seismometers and the thermoelectric generators, are mounted in Fiberglas suitcases and are transportable as air freight. The system contains approximately 20 pieces and weighs 1500 pounds with long-period capability. The total weight of the system without the long-period seismometers and amplifiers is about 900 pounds. The system contains a 3-component set of long-period seismographs and a 3-component set of short-period seismographs to record seismic data in the frequency range of 0.01 to 10 hertz cps. A magnetic-tape recorder with a tape speed of 0.03 ips is used to record 14 channels of data. In addition to 12 channels of seismic data, WWV time, coded station time, and binary-coded-decimal time are recorded.