Does apparent stress vary with earthquake size?

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. W e estimate an adjustment factor to account for the probable missing energy and apply it to three previously studied data sets with limited recording b andwidth. We find that this adjustment, together with accounting for possib ly missing events, eliminates much of the moment dependence of radiated ene rgy found previously. We obtain a nearly constant ratio of radiated energy to seismic moment, 3 x 10(-5), or 1 MPa of apparent stress drop, over 17 or ders of seismic moment. This suggests that deviation from similarity of the energy radiation for seismic events essentially the entire observable rang e of earthquake size may not yet be resolved.