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Date Time Deep earthquakes within Juan de Fuca plate produce few aftershocks In the Cascadia subduction zone, medium- and large-sized “intraslab” earthquakes, in which the slip happens within the oceanic plate and below the continental plate, will likely produce only a few detectable aftershocks, according to a new study from the University of Washington and the U.S. Geological Survey. Seismologists currently make aftershock forecasts based in part on data from other subduction zones around the world. But new research shows that Cascadia intraslab earthquakes, slips that occur within the subducting Juan de Fuca tectonic plate, produce fewer aftershocks compared to similar quakes in other subduction zones. The study shows that in Cascadia, the number of aftershocks for a given magnitude event are less than half the global average for this type of earthquake.

United statesVancouver islandBritish columbiaPaul bodinJoan gombergPacific northwest seismic networkUs geological survey in seattleUniversity of washingtonUs geologicalBulletin of the seismological society americaGeological survey of canadaSeismological societyJuan de fucaGeological surveyPuget lowlandsCape mendocino