Implications of felt area-magnitude relations for earthquake scaling and the average frequency of perceptible ground motion

Bulletin of the Seismological Society of America
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Abstract

Observed relations between felt area and moment magnitude M for stable continental regions (SCR) and California earthquakes can be explained by a simple model with geometrical spreading, attenuation (Q−1), and earthquake stress drops that remain constant from M 4 to 8. Differences in the slopes of the observed felt area-M relations between SCR and California earthquakes are consistent with differences in Q between these tectonic settings. Fitting the felt area-M data to the model yields an estimate of f/Q, where f is the average frequency of minimum perceptible ground motion. Using fits to the data and instrumentally derived values of Q, I find that f is between about 2 and 4 Hz. I present an estimate of the spectral acceleration level associated with the lower limit of perceptibility.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Implications of felt area-magnitude relations for earthquake scaling and the average frequency of perceptible ground motion
Series title Bulletin of the Seismological Society of America
Volume 84
Issue 2
Year Published 1994
Language English
Publisher Seismological Society of America
Description 4 p.
First page 462
Last page 465
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