Accession Number : AD0850352

Title :   Application of a Vertical Strain Seismograph to the Enhancement of P Waves.

Descriptive Note : Technical rept.,

Corporate Author : GEOTECH GARLAND TX

Personal Author(s) : Shopland, Robert C. ; Kirklin, Richard H.

Report Date : 12 MAR 1969

Pagination or Media Count : 41

Abstract : Enhancement of P waves is obtained by the suppression of microseisms with a combination of vertical linear strain seismograph and vertical inertial seismograph outputs. Significant suppression is observed at sites where the predominant microseisms consist of essentially single-mode Rayleigh waves in contrast to that observed at a site where the microseismic noise is compositionally more complex. A description is given of the vertical linear strain seismograph used in these investigations. Consideration is given to the use of a vertical transverse strain seismograph at sites where the microseismic noise field is complex. (Author)

Descriptors :   (*SEISMOLOGICAL STATIONS, NOISE), (*UNDERGROUND EXPLOSIONS, DETECTION), MICROSEISMS, POWER SPECTRA, SEISMOMETERS, PHASE STUDIES, AMPLITUDE MODULATION, NUCLEAR EXPLOSIONS, RESPONSE, SEISMIC WAVES, FREQUENCY, RAYLEIGH WAVES, EARTHQUAKES, RECORDING SYSTEMS, OKLAHOMA.

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE