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Comparison of Strong Motion and Weak Motion Recordings of the Loma Prieta Sequence

by O. Bonamassa, H. Houston and J.E. Vidale

Bonamassa, O., H. Houston and J.E. Vidale (1992). Comparison of Strong Motion and Weak Motion Recordings of the Loma Prieta Sequence. SMIP92 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 3-1 - 3-10.

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Abstract

The Loma Prieta earthquake sequence has provided the opportunity to compare ground motion recorded both during an magnitude 7 mainshock and numerous magnitude 2.5 to 4.5 aftershocks at 14 sites. We find two results, (1) weak motion recordings of aftershocks have predictive power to indicate the directionality of the shaking in the mainshock, and (2) non-linearity during mainshock strong motions is suggested at the sites that suffered the largest accelerations in the mainshock.