Accession Number : ADA256498


Title :   Surface Gravity Waves And Ambient Microseismic Noise


Descriptive Note : Final technical rept.


Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA


Personal Author(s) : Guza, R T


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a256498.pdf


Report Date : Sep 1992


Pagination or Media Count : 6


Abstract : A coherent array of 24 pressure transducers was deployed on the sea bed in 13 m depth, approximately 2 km from shore, at Duck, North Carolina. The objective of this experiment was to examine the generation of low frequency (0. 005-0.05 Hz) and high frequency (0.25--1.0Hz) pressure fluctuations on the sea floor through nonlinear interactions of sea and swell. The pressure transducers were carefully positioned and buried about 10 cm within the sandy sea bed to reduce flow noise. The sample frequency is 4 Hz. Data was collected nearly continuously between 3 September and 1 December 1990. During this period, a 170 minutes long data run was acquired every 3 hours. The sea floor pressure measurements collected in 13 m depth are unique in terms of the array aperture, number of sensors deployed, sensor placement accuracy, the wide range of wave conditions encountered and the available environmental data (extensive bathymetry and wind data were collected by the Army Corps of Engineers Field Research Facility).


Descriptors :   *SURFACE WAVES , *GRAVITY WAVES , FREQUENCY , WIND , GRAVITY , NOISE , SEISMIC ARRAYS , OCEAN BOTTOM , TRANSDUCERS , SURFACES , OCEAN WAVES


Subject Categories : Physical and Dynamic Oceanography


Distribution Statement : APPROVED FOR PUBLIC RELEASE