At 6:50 am EST 20 April 2002 an earthquake caused moderate (MMI VII) to light (MMI VI) damage in an area of the northeastern Adirondack Mountains centered near the town of Au Sable Forks, New York (the early unofficial designation “Plattsburgh earthquake” was potentially confusing and was abandoned because the damage area did not include the town of Plattsburgh). The felt radius is several hundred kilometers and is consistent with the low attenuation typical of the region. Moment-tensor inversion and spectral analysis of regional mainshock waveforms and early aftershock hypocenters from local stations delineate a source about 7 km north...

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