Figure 2. Schematic dip cross-section indicating the occurrence of brittle-fracture earthquakes (marked by stars with released energy radiating omni-directionally) and slow/silent earthquakes (S/S E) (marked by “shaded patch” as semi-plastic, non-brittle flow, changing volumes, ergo, stresses, within the sedimentary wedge; as represented here, the S/S Es are originating circa the paleo-shelf-breaks and their listric faults and along the mid to lower slope; an infinity of other origins are conceivable).  Shelf-break/upper slope originating slump blocks/debris flows also provide energy to the margin.