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The National Research Institute for Earth Science and Disaster Prevention detected the unusual vibration from the M6.8 intermediate-depth earthquake beneath northern Japan on July 24th, 2008 by Hi-sensitivity seismograph NETwork (Hi-net) and clarified that they were the T waves scattered from the Emperor seamount chain in the northern Pacific Ocean.
T waves are often observed comparatively in the shallow earthquakes just beneath the ocean and deep earthquakes in the subducting plate, but it was the first time to have observed such T waves that were scattered back from the seamount chain.This research result has been published online on the “Geophysical Research Letters” of the America Geophysical Union (AGU) website.

please refer to the URL below. 

※An edited version of this paper was published by AGU. Copyright(2009) American Geophysical Union.