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Ocean microseism measurements with a neutral bouyancy free-floating midwater seismometer

H. BRADNER, LOUIS G. DE JERPHANION^* and RICHARD LANGLOIS

INSTITUTE OF GEOPHYSICS AND PLANETARY PHYSICS UNIVERSITY OF CALIFORNIA, SAN DIEGO, P.O. BOX 109, LA JOLLA, CALIFORNIA 92037

Abstract

Seismometers in spherical aluminum pressure housings have been weighted to float stably at midwater depths in the ocean, and thus record water motions in a frequency band of 0.02 to 5 cps. Simultaneous records made with a midwater instrument at 1.2-km depth and a bottom instrument at 4.6-km depth showed coherence at spectral power peaks of leaky organ-pipe frequencies and additional coherence peaks at frequencies down to 0.025 cps. Twenty organ-pipe modes can be tentatively identified. The spectral power can be attributed almost entirely to microseismic motions in wave-guide modes. We conclude that the forcing functions for microseisms are broad enough so that deep ocean-bottom and midwater microseism spectral peak frequencies are characteristic of local bathymmetry.

Footnotes

^* Present address: Intertechnique, 78 Plaisir, Paris France.

Present address: Department of Chemistry, Columbia University Graduate School, New York, New York 10021.

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