Accession Number : AD0480394

Title :   EVALUATION OF A GEOTECH MODEL 20171 SEISMOMETER.

Descriptive Note : Technical rept.

Corporate Author : GEOTECH GARLAND TX

Report Date : 01 OCT 1965

Pagination or Media Count : 49

Abstract : Field test results of a Model 20171 Shallow-Hole Seismometer are presented. Tests were conducted with the seismometer located at various depths in a 152 m deep hole. Data are compared with recordings from a Model 11167 Deep-Hole Seismometer, located at a depth of 150 m in the same hole. Results indicate that the operation of the shallow-hole seismometer compares favorably with that of the deep-hole seismometer. Frequency-domain measurements of teleseismic signals recorded by both systems indicate that the signals are generally similar, but never identical. This difference can be explained by the different transducers used in each seismometer and by the slightly different frequency response of the two systems. In conjunction with the above tests, field evaluation of two solid-state FM amplifiers, was also conducted. Results of the amplifier noise tests indicate that the noise level referred to the input of each amplifier is slightly higher than those specified in the preliminary specifications for each unit. (Author)

Descriptors :   (*SEISMOMETERS, PERFORMANCE(ENGINEERING)), PERFORMANCE(ENGINEERING), MEASUREMENT, SPECIFICATIONS, TEST METHODS, SEISMIC WAVES, NOISE ANALYZERS, FREQUENCY ANALYZERS, TRANSDUCERS.

Subject Categories : Seismology
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE