The Chelmsford earthquake of June 23, 1938, occurred at 03h 57m 56s.5 G.C.T. The epicentral determination made by the writer of this article is 71° 25′ W, 42° 37′ N. The distance-arcual intersection occurs at the southernmost tip of an ellipse of greatest intensity, and this may be due to the fact that all three stations employed in the determination were to the south and west of the area, or that structural conditions elongated the greatest intensity area. The major axis of the ellipse does coincide with the strike of the geologic structure in this area. The greatest intensity given by the writer is IV on the Rossi-Forel Scale.

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