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Source properties of a Blue MT. Lake earthquake

LAMONT-DOHERTY GEOLOGICAL OBSERVATORYANDTHE DEPARTMENT OF GEOLOGICAL SCIENCES OF COLUMBIA UNIVERSITY, PALISADES, NEW YORK 10964

Abstract

An accelerogram obtained at Blue Mt. Lake, New York is remarkable for the simplicity of its S-wave pulse. This results from (1) a nearly complete absence of scattering and reflections as second arrivals on the accelerogram, and (2) a very elementary earthquake source. The earthquake identified with this accelerogram had a magnitude m_b = 2.2 and a hypocentral distance of about 1 km from the accelerometer. Spectral analysis of the S wave indicates the earthquake had a moment of 8 x 10¹⁸ dyne-cm, and a source radius of 20 to 40 m. When the accelerogram is integrated to obtain displacement, there is a step offset of about 5µ associated with a near-field component of the S-wave pulse. The S-wave, including the step offset, can be matched in remarkable detail by a dislocation model with a moment of 8.4 x 10¹⁸ dyne-cm.

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