Seismicity, Recurrence Rates, and Regionalization of the Northeastern United States and Adjacent Southeastern Canada

摘要

A more complete, accurate, and corrected catalog of earthquakes occurring in the northeastern United States and adjacent southeastern Canada between the years 1534-1977 has been compiled from all available sources. The catalog includes reevaluated intensities and locations for many events. Events of intensity VIII occur only occasionally and do not follow the behavior of the recurrence for Modified Mercalli intensity greater than or equal to VII; furthermore, no events of intensity IX or above have occurred thus far except for La Malbaie. The La Malbaie area, however, displays a linear behavior throughout the entire range of observed intensities. Northeastern North America has been regionalized into 25 subregions based on activity and using a weighted technique. These contain more than 80% of the total activity which has occurred. The historical seismic activity in northeastern North America displays no apparent dependence on time for events above Modified Mercalli intensity equal to VI.