Abstract
THE detection of premonitory variations in the ratio of compressional to shear wave velocities is one of the most promising tools for earthquake prediction1,2. Changes in VP/VS for some moderate sized earthquakes (M ≊ 5–6) located on Japanese islands have been found3,4, and for shallow, small to moderate sized earthquakes (M < 7) located on continents. For large submarine earthquakes (M ≊ 8), however, velocity changes have not previously been reported.
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References
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IIZUKA, S. Changes in Vp/VS before the Tokachi-oki earthquake of May 16, 1968 off NE Japan. Nature 260, 415–417 (1976). https://doi.org/10.1038/260415a0
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DOI: https://doi.org/10.1038/260415a0
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