L13_WavesAndRaysII-page10 - to the magnet generating a...

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Applied Geophysics – Waves and rays - II Seismic sources Consider Energy input Repeatability Cost Convenience Explosives • Various sizes – target depth • Safety and expense can be an issue Air guns •A t sea • Very repeatable • Large array for big signal Vibroseis • No pulse, frequency sweep • Significant signal with stacking/deconvolution Applied Geophysics – Waves and rays - II Seismic receivers Geophones
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Unformatted text preview: to the magnet generating a electrical signal Geophones are sensitive to velocity Hydrophones Used at sea Use piezoelectric minerals to sense pressure variations Instrument response The relation between the input ground motion and the output electrical signal Natural frequency The frequency which produces the maximum amplitude output Damping Reduces the amplitude of the natural frequency response and prevents infinite oscillations Want a flat response...
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This note was uploaded on 01/07/2012 for the course PHYSICS 384 taught by Professor Wei during the Spring '09 term at SUNY Stony Brook.

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