The estimation of ocean bottom seismographs' coupling characteristics by means of microshock recordings |
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| Authors: | A A Ostrovsky |
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| Institution: | (1) P. P. Shirshov Institute of Oceanology, U.S.S.R. Academy of Sciences, Krasikova 23, Moscow, U.S.S.R. |
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| Abstract: | A transient technique was used for estimating the bottom-instrument response function in experiments with bottom seismographs (OBS) in deep ocean. The sharp mechanical impacts on bottom seismograph usually induced by bottom displacements under the instrument (microshocks) are suggested as rough analogues of the impulses for the bottom-instrument system transient calibration. It has been found that microshocks has usually sufficiently small duration to be used for coupling characteristics estimates. Test measurements have shown that in many cases this method makes it possible to distinguish spectral features characterising earthquakes and seismic noise wavetrains from those which are caused by coupling resonances of the OBS-sediment inter-face. |
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| Keywords: | ocean bottom seismographs transient calibration coupling effect |
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