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GEOPHYSICAL RESEARCH LETTERS,
VOL. 28, NO. 17,
PAGES 3349–3352,
2001
Does Apparent Stress Vary with Earthquake Size?
Satoshi Ide
Earthquake Research Institute, University of Tokyo
Gregory C. Beroza
Department of Geophysics, Stanford University
Abstract
Seismic energy is distributed across a wide frequency band so that limited bandwidth recording can lead to substantial underestimates
of the radiated seismic energy or introduce an artificial upper bound of radiated energy. We estimate an adjustment factor
to account for the probable missing energy and apply it to three previously studied data sets with limited recording bandwidth.
We find that this adjustment, together with accounting for possibly missing events, eliminates much of the moment dependence
of radiated energy found previously. We obtain a nearly constant ratio of radiated energy to seismic moment, 3 × 10−5, or 1 MPa of apparent stress drop, over 17 orders of seismic moment. This suggests that deviation from similarity of the
energy radiation for seismic events essentially the entire observable range of earthquake size may not yet be resolved.
Received 1
March
2001;
accepted 27
June
2001.
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Citation: Ide, S., and G. C. Beroza
(2001),
Does Apparent Stress Vary with Earthquake Size?,
Geophys. Res. Lett.,
28(17),
3349–3352.
Copyright 2001 by the American Geophysical Union.
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