| Earth Noise in the 20- to 100-Second Period Range. |
09 SEP 1975 |
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| Authors:
E. J. Douze; TELEDYNE GEOTECH GARLAND TEX
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 | Experiments to investigate the sources of seismic noise in the period range of 20 to 100 seconds have been conducted at three observatories, Grand Saline and McKinney, Texas and Pinedale, Wyoming. For surface seismographs the main contributor to the noise is quasi-static earth motion caused by wind-generated pressure variations. These pressure variations were recorded by microbarographs and shown to be linearly related to the noise recorded by seismographs during windy ... |
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| Deep Borehole Operation of the Borehole Seismometer System, Model 36000. |
15 MAR 1975 |
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| Authors:
E. J. Douze; John R. Sherwin; TELEDYNE GEOTECH GARLAND TEX
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| The project described was concerned primarily with, first, the modification of the Borehole Seismograph System, Model 36000, to operate under the high pressure and high temperature environment encountered in boreholes up to 3000 m (10,000 ft) deep, and secondly, various studies of signals and noise as a function of depth. Modification of the instrument, along with required auxiliary equipment was relatively straightforward and consisted primarily of substitution of high-reliability, 105C ... |
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| Studies of Long-Period Seismic Noise Generated by Atmospheric Pressure Changes. |
01 AUG 1974 |
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| Authors:
G. G. Sorrells; E. J. Douze; TELEDYNE GEOTECH GARLAND TEX
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| Potential contribution of atmospheric pressure sources other than the wind to the seismic noise spectrum in the 20-100 second period range was studied. Results indicate that during calm intervals in the winter months, pressure related earth motion makes a substantial contribution to the observed earth noise spectrum. This contribution becomes detectable at periods on the order of 25 seconds and becomes the principal source of ambient earth motion at periods ... |
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| SHORT-PERIOD SEISMIC NOISE. |
31 MAY 1968 |
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| Authors:
E. J. Douze; GEOTECH GARLAND TEX
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| The purpose of the report is to document the work done on the Study of Short-Period Seismic Noise. Work on this contract has been conducted over a span of about five years. Aside from the study of noise and signals, one of the chief aims of the Noise Study Program was to present findings at scientific meetings and to publish data in appropriate journals. Abstracts of all reports and papers ... |
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| STUDY OF SHORT-PERIOD SEISMIC NOISE. |
08 AUG 1966 |
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| Authors:
E. J. Douze; GEOTECH DIV TELEDYNE INDUSTRIES INC GARLAND TEX
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| The report describes studies on spectral moments, sources of microseisms, statistical analysis, short-period surface waves, and the Special Orientation Program. (Author) |
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| STUDY OF SHORT-PERIOD SEISMIC NOISE. |
15 FEB 1966 |
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| Authors:
E. J. Douze; GEOTECH DIV TELEDYNE INDUSTRIES INC GARLAND TEX
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| Studies of short-period seismic noise were conducted and are presented. Studies that are in progress are: a study of higher mode surface waves from earthquakes and a study of the 2 cps peak in noise. The status of the special orientation program is discussed and a schedule for completion of this task is given. Appendix 1 presents a summary of the results obtained over the last few years in the ... |
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| STUDY OF SHORT-PERIOD SEISMIC NOISE. |
02 AUG 1965 |
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| Authors:
E. J. Douze; Herbert Robertson; GEOTECHNICAL CORP GARLAND TEX
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| This report describes work on short-period seismic noise, signals, and signal-to-noise ratios. It includes: (1) a section on statistical measurements of noise and some sampling techniques in use, (2) a section on visual and spectral techniques that were used to detect body waves in the short-period noise recorded by a deep-hole array at Grapevine, Texas, (3) a section on a filtered narrow-band seismograph that was designed to reduce noise outside ... |
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| STUDY OF SHORT-PERIOD SEISMIC NOISE. |
12 JAN 1965 |
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| Authors:
E. J. Douze; GEOTECHNICAL CORP GARLAND TEX
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| The report presents the results of studies of short-period seismic noise, signal levels, and signal-to-noise ratios. Section 2 describes the wave types present in the noise between periods of 1.0 and 6.0 sec. Section 3 describes the results of an experiment in optimum filtering. Appendices 1 and 2 are studies on the effect of seismometer burial and of topography on wind-induced noise. Appendix 3 describes an orientation course for foreign ... |
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