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What do you suppose the two things that Hugo Benioff noticed about the distribution of earthquake foci beneath

deep-sea trenches of the western Pacific? (Hints: one has to do with the shape of the space delineated by foci and the other has to do with distribution of that space relative to the trench and volcanic islands).

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First observation: Eartquake foci (sources) get deeper under the overriding tectonic plate proceeding away from the... View the full answer

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