Abstract

Single-event focal mechanisms for fifteen earthquakes in New England and New York have been determined. Thirteen of these are new focal mechanisms, while two are redeterminations for events with previously reported solutions. The focal mechanisms display considerable scatter in P-axis orientation, as has been reported in earlier studies. Some areas within the region, such as central New Hampshire and northeastern Massachusetts, show locally consistent principal stress directions. Other areas, such as central Maine, do not. All but one or two of the new focal mechanisms have P-axis and T-axis orientations which fall within the range of values calculated by Gephart and Forsyth (1985) for a regional stress field of horizontal, E-W maximum stress and vertical minimum stress in New England.

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