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Hi Alex, the majority of earthquakes occour in a zone which is between 10 to 20 kilometres deep so there is already a massive weight of solid rock pushing down. Added to this the fact that the plates are moving constantly and the the back pressure is continuing to build it is conceivable that in the event of a high tide in that region would add extra weight to the sea bed floor.
I think that it would be seen as a contributing factor rather than a cause.
Cheers
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