For more than 100 years, scientists have been searching for a temporal relation between earthquakes and the Earth's tides (Schuster, 1897; Emter, 1997). Such a relation is plausible because the tides wax and wane with predominantly diurnal (12-hour) and fortnightly (14-day) periods. This plausibility is strengthened by the fact that the stressing rates in the Earth's crust resulting from the tides are far greater than from other known loads, such as tectonic plate motions (Vidale et al., 1998).

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Studies from the last 10 years have focused on diurnal tides. The highest-resolution studies find at...

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