Very long-period Rayleigh waves detected in Texas from a large source area exhibited remarkably stable dispersion characteristics. It appears that similarities in the gross structure of the Earth have created a wave guide over the pole from the source area, the Sino-Soviet landmass. These observations were made possible by using a seismograph system which had a peak response at a longer period than usual (50 sec), enabling the detection of very long-period Rayleigh waves from small earthquakes at teleseismic distances.

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