Tides, Earthquakes, and Volcanoes

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Science  19 Jul 2002:
Vol. 297, Issue 5580, pp. 348-349
DOI: 10.1126/science.1074601

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Earthquakes and volcanic eruptions are caused primarily by plate tectonics. But as Kasahara explains in his Perspective, several recent studies provide evidence that tidal forces influence earthquakes associated with volcanic activity. This idea was first suggested in the 1930s, but the forces involved were long considered too weak and the evidence too limited. Recent results from the Juan de Fuca Ridge in the Pacific show a particularly clear diurnal pattern attributed to ocean tides.