4/5 this is usually interpreted to mean that slip HAS to stay mostly offshore and shallower than 15km because in elastic dislocation models subsidence occurs downdip of where slip ends, never up dip, see this schematic from @WitterBanter's work in Alaska h
Witter et al. (2014) investigated the Shumagin Islands in search of evidence for great EQs and tsunamis and found none. The islands overlie a persistently (last ~3.4ka) creeping section of the megathrust, but rare, great earthquakes cannot be ruled out htt
@tsuphd Yeah, the prospect of shallower slip is real nearly everywhere along the Semidi section and into the Shumagins (see 2014 paper by @WitterBanter https://t.co/zJSF9K3nP2). Freymueller et al favor a relatively shallow slip model for 1938 (ttps://doi.o