Journal Highlights

Comparing earthquake spectra

Editor’s Highlight—


In seismology, we do not know whether the earthquake source is best represented as an expanding crack or a propagating pulse. Perhaps neither is the actual representation when the faulting is heterogeneous. However, the literature generally separates into the two mentioned models for homogeneous stress. This paper considers how we might distinguish between the two from observations. Moreover, it points out the differences one might expect in stress drop from the two models. These results complement those of Kaneko and Shearer [2014] in looking at the correct scaling between corner frequency and source radius. Overall, this paper makes a great contribution to a growing body of work, both observational and theoretical, on earthquake spectra, which can eventually help understand the scatter and mitigate the uncertainties of stress drop estimates.