This figure shows the Juan de Fuca plate subducting under the North American plate. The stippled area (all the little black dots) on the JdF plate represent the foci of earthquakes. Which kind of earthquakes are they?
1. Benioff quakes
2. shallow crustal quakes (e.g. Seattle/Tacoma fault quakes)
3. megathrust quakes
Answer : Megathrust quakes.
Explanation : The stippled area beneath a subducting plate representing the foci of earthquakes is the Wadati Benioff Zone and the earthquakes occuring at such destructive convergent boundaries are the Megathrust earthquakes.
This figure shows the Juan de Fuca plate subducting under the North American plate. The stippled...