Comparison of seasonal variations in the distribution of long period “hum” sources

Comparison of seasonal variations in the distribution of long period “hum” sources (top) from array analysis using very broadband seismograph (STS-1) recordings, and significant wave height in the oceans (bottom) from satellite observations. Hum sources (the color bar indicates areas generating hum with amplitudes larger than 85% of the maximum) track the location of the strongest winter storms. Top left: averages for the winter months (January to March and October to December). Top right: averages for the summer months (April to September). Bottom: averaged images from Topex/Poseidon for the month of January (left) and July (right). (Reprinted by permission from Macmillan Publishers Ltd: J. Rhie and B. Romanowicz, 2004. Excitation of Earth’s incessant free oscillations by atmosphere-ocean-seafloor coupling, Nature, 431:552–556, doi:10.1038/nature02942, ©2004.)

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