Abstract
Several years of continuous low-frequency underwater ambient noise data have been made available for examination by the Comprehensive Nuclear Test Ban Treaty Organization (CTBTO). The data provide ambient noise in the spectral range from 1 to 120 Hz, and studies of the data are in progress at several organizations. Results presented here address the frequency band from 1 to 10 Hz, with special emphasis on discovering evidence of long-term changes in the environment and on quantifying by means of the variance spectrum the contributions of separate noise sources. Long range horizontally refracting propagation and noise source models are used to estimate the contribution of distant events to the observed noise level.
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