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The June 13, 1975 earthquake and its relationship to the New Madrid seismic zone

SAINT LOUIS UNIVERSITY DEPARTMENT OF EARTH AND ATMOSPHERIC SCIENCES, ST. LOUIS, MISSOURI 63156

Abstract

The June 13, 1975 earthquake in the New Madrid seismic zone produced the first recorded strong-motion accelerograms for an event in the region, as well as the largest recorded accelerations to date for any event in eastern North America. The peak strong-motion values obtained from an analysis of the accelerograms are the following: a_max = 43 cm/sec², v_max = 1 cm/sec and d_max = 0.05 cm for the longitudinal S88°W component; a_max = 31 cm/sec², v_max = 0.6 cm/sec and d_max = 0.01 cm for the DOWN component; a_max = 64 cm/sec², v_max = 1.6 cm/sec², and d_max = 0.09 cm for the tangential S02°E component.

Source parameter estimation using long-period surface waves, Lg spectra, P-wave first motions and the integrated accelerograms leads to a consistent solution. The seismic moment is estimated to be 4E21 dyne-cm and the corner period 0.6 sec. The corner period-seismic moment pair for this event agrees with the regional scaling of these parameters observed by Street et al. (1975).

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