Many are too small to feel. No significant amount of motion has been shown for any fault since the last Ice Age, about 20,000 years ago, and geologic evidence demonstrates that many faults have been inactive since the formation of the Appalachians, over 300,000,000 years ago. The USGS database shows that there is a 2.63% chance of a major earthquake within 50km of Lewiston, ME within the next 50 years. There is a low but steady rate of earthquake occurrence. April 6, 1807: Advocates of the District of Maine’s separation from Massachusetts suffer their worst referendum defeat – 9,404 to 3,370. Earthquake events prior to 1975 are considered part of the historical record. The record of earthquake activity prior to the mid-1800's is sparse and of uneven quality (Ebel, 1989). Seismic activity in Maine is typical of the Appalachian region of northeastern North America. The St. Lawrence Valley northeast of Quebec City is perhaps the most active area in northeastern North America, but has a low population density. The most notable of these was the earthquake of November 18, 1755 with an epicenter offshore from Cape Ann, Massachusetts. In general, earthquakes with magnitudes less than 5.0 (corresponding approximately to Modified Mercalli intensity VI) cause little or very localized damage (Johnston, 1995). Recorded earthquake locations and detailed seismic motion studies do not show any clear correlation with either local or regional geologic features (Ebel, 1989). After an eathquake event, the MGS collects information from people in the area through an The New England Seismic Network, operated by the Weston Observatory of Boston College, maintains a network of seismic stations across New England that monitors, analyzes, and reports earthquake activity in Maine.Anderson, Walter A., Borns, Harold W., Jr., Kelley, Joseph T., and Thompson, Woodrow B., 1989, Neotectonic activity in coastal Maine, Ebel, John E., 1984, Statistical aspects of New England seismicity from 1975 to 1983 and implications for past and future earthquakes: Seismological Society of America, Bulletin, v. 74, p. 1311-1330.Ebel, John E., 1985, A study of seismicity and tectonics of New England: Report NUREG/CR-4353, Weston Observatory, Weston, Mass.Hodgson, E.A., 1950, The Saint Lawrence earthquake, March 1, 1925: Publication of the Dominion Observatory, Ottawa, Ont., v. 7, no. No significant amount of motion has been shown for any fault since the last Ice Age, about 20,000 years ago, and geologic evidence demonstrates that many faults have been inactive since the formation of the Appalachians, over 300,000,000 years ago.

The most notable of these was the earthquake of November 18, 1755 with an epicenter offshore from Cape Ann, Massachusetts. Lewiston has had: (M1.5 or greater) 0 earthquakes in the past 24 hours 0 earthquakes in the past 7 days; 0 earthquakes in the past 30 days; 3 earthquakes in the past 365 days Seismic activity in Maine is typical of the Appalachian region of northeastern North America. Other significant earthquakes in the surrounding region that have affected Maine are listed in Table 4.The Maine Geological Survey (MGS) routinely maps, interprets, and publishes basic bedrock, surficial, and marine geologic information for Maine.

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