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First strong-motion records from a central or eastern United States earthquake

LAMONT-DOHERTY GEOLOGICAL OBSERVATORY AND THE DEPARTMENT OF GEOLOGY OF COLUMBIA UNIVERSITY, NEW YORK

Abstract

Two strong-motion accelerographs were installed at Blue Mountain Lake, New York (BML) shortly after the initiation of a swarm-type sequence of earthquakes in mid-July of 1973. Three records rich in frequencies as high as 35 Hz were obtained from two of the largest events (magnitude 2.7 and 2.6), the foci of which were between 1.0 and 4 km from the accelerograph stations. The maximum acceleration recorded was –0.034 g at 25 Hz. These are the first strong-motion records obtained from east of the Rocky Mountains. Inasmuch as strong-motion results from the Western United States may not be applicable to the eastern two-thirds of the United States, these new results have important implications for the design of critical facilities such as nuclear power plants, liquified gas storage tanks, and large dams.

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