1977•CaltechAUTHORS (California Institute of Technology)Open access

A note on the correlation of frequency-dependent duration of strong earthquake ground motion with the Modified Mercalli Intensity and the geologic conditions at the recording stations

Mihailo D. Trifunac, Bruce D. Westermo

Abstract

The frequency-dependent duration of strong earthquake ground motion, based on the mean-square integrals of motion, has been correlated with the reported Modified Mercalli Intensity at the recording site. Simple relations have been pre-sented which describe the overall trends of computed durations for different levels of Modified Mercalli Intensity and for three classes of site geology.

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Key concepts: Mercalli intensity scale, Intensity (physics), Ground motion, Geology, Seismology, Geodesy, Duration (music), Motion (physics)