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

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

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Credit:
Macmillan Publishers Ltd: J. Rhie and B. Romanowicz, 2004

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Seismic cross section of a subsurface clay-bounded channel

Description

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.)

Date Taken: February 18, 2009
Photographer / Contributor: Macmillan Publishers Ltd: J. Rhie and B. Romanowicz, 2004

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Seismological_Grand_Challenges, Long_Range_Science_Plan,

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