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A feasibility study for a portable long period seismograph Bolduc, Pierre-Michel
Abstract
As a preliminary study to the operation of a portable long period seismic system, the effects of environment on the phase response of the Sprengnether 201 and Geotech SL-210 long period vertical seismometers are investigated. It is found that changes in the phase response of the seismometers are related to the zero instability of the moving mass. Pressure changes are not important in this regard; however, temperature variations should be held to less than 1°C. Calculation of the phase response directly from the amplitude response is investigated. It is concluded that it is more practical to carry out a phase calibration directly. The technique may however be useful when only an amplitude calibration is known. Also investigated are the noise properties of two amplifiers: the solid state Geotech AS-330 and the phototube Geotech 12613 amplifiers. The fundamental noise of the seismometer-amplifier combination is negligible. The excess noise of the AS-330 amplifier is of the same order as seismic noise at long periods at a rather noisy site.
Item Metadata
Title |
A feasibility study for a portable long period seismograph
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1971
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Description |
As a preliminary study to the operation of a portable long period seismic system, the effects of environment on the phase response of the Sprengnether 201 and Geotech SL-210 long period vertical seismometers are investigated. It is found that changes in the phase response of the seismometers are related to the zero instability of the moving mass. Pressure changes are not important in this regard; however, temperature variations should be held to less than 1°C.
Calculation of the phase response directly from the amplitude response is investigated. It is concluded that it is more practical to carry out a phase calibration directly. The technique may however be useful when only an amplitude calibration is known.
Also investigated are the noise properties of two amplifiers: the solid state Geotech AS-330 and the phototube Geotech 12613 amplifiers. The fundamental noise of the seismometer-amplifier combination is negligible. The excess noise of the AS-330 amplifier is of the same order as seismic noise at long periods at a rather noisy site.
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Genre | |
Type | |
Language |
eng
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Date Available |
2011-04-08
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0053438
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.