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to muddy intertidal sediment and the associated microfossils in the estuary, researchers were able to determine 10 instances of sudden rises in sea level as a potential proxy for earthquakes, including two dating 1,700 and 2,300 years ago when sea level rose by at least half a meter. This same study also found evidence of a large earthquake 300 years ago along the great plate boundary. In addition, sea level rise 20,000 years ago drowned the prior river mouth,

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