The historic earthquake of 18 November 1755, the largest in the New England catalog, was felt widely throughout the American colonies and adjacent Canada (Street and Lacroix, 1979; Ebel and Kafka, 1991). Moderate damage—toppled stone walls, broken chimneys, cracks and liquefaction—was largely restricted to the lowland north of Boston near Cape Anne, with an inferred epicenter on the continental shelf to the east (42.70°N, 70.30°W. The earthquake has been assigned an epicentral Modified Mercalli intensity of 8 and a magnitude of 6.0.

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Abrupt, long-term changes in the flow rate and chemistry of water wells from five Connecticut...

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