Instrument calibration of ocean bottom seismographs |
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| Authors: | Allan M Sauter Leroy M Dorman |
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| Institution: | (1) Scripps Institution of Oceanography, 92093 La Jolla, CA, U.S.A. |
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| Abstract: | To increase the accuracy of measuring sea floor motion with ocean bottom seismometers, we calibrate the seismometer system on the ocean floor. Data from the sea floor calibration, augmented with electronic and land calibration data, enables us to find the OBS transfer function to an accuracy of 0.5% in the frequency range of 0.1 to 32 Hz. We are able to distinguish between temperature, instrument and OBS ground coupling effects, all of which alter the transfer function. This paper reviews our method of calibration and discusses the effects of temperature and some of the instrument design features on the vertical seismometer transfer function. |
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