Extended Data Fig. 3: Depth variation of STF features \(\widetilde F_m\) and \(\widetilde T\) and interpretation as Earth’s depth-varying rigidity.
From: Similar seismic moment release process for shallow and deep earthquakes
(a) Left panel: depth-dependency of \(\widetilde F_m\). Gray dots represent the \(\widetilde F_m\) of individual earthquakes. Red squares with vertical bars are the average and standard deviation over a 50-km bin. The number of events per bin are 2625, 310, 223, 121, 86, 29, 8, 37, 28, 27, 34, 74 and 62 from shallow to deep depths. Green stars represent large tsunami earthquakes. The blue curve represents the theoretical prediction of \(\widetilde F_m\) using a modified preliminary reference Earth model under a constant strain drop assumption (after Vallée, 2013). Right panel: similar to the left panel for Synthetic \(\widetilde {{{\mathrm{F}}}}_{{{\mathrm{m}}}}\) predicted by the constant strain drop assumption with added Gaussian perturbation (standard deviation 0.18 for 0–60 km and 0.15 for 60–700 km). (b) Similar to (a) but for \(\widetilde T\) (standard deviation 0.22 for 0–60 km and 0.14 for 60–700 km). S-D: shallow and deep earthquake classification; ID-DF: intermediate-depth and deep-focus earthquake classification.
