Bottom seismometer observation of airgun signals at Lopez Island |
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Authors: | S H Johnson R E McAlister |
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Institution: | (1) School of Oceanography, Oregon State University, 97331 Corvallis, Oregon, USA;(2) Present address: Amoco Production Research, PO Box 591, 74102 Tulsa, OK, USA;(3) Present address: Intel Inc., Hillsboro, OR, USA |
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Abstract: | First arrival compressional wave signals from an airgun source, as detected by a variety of seismometers in a shallow bay, are remarkably uniform. However, minor variations in wavelet appearance imply some combination of the instrument response and coupling to the bottom. Signal spectra show typically a spectral peak at 12 Hz and an envelope very similar to that expected from an airgun source. Those instruments with a decoupled geophone package have spectra most like the theoretical spectrum but spectra for the other instruments are not significantly different. Little variation exists in spectra between tripod-mounted and inverted-pendulum OBS configurations for the low amplitude P-waves observed here. The signal source is the principal influence on the resulting spectra rather than OBS configuration or bottom coupling. |
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