Sentence:  Earthquakes on the <WSD>subduction</WSD> interface itself are low-angle thrusts in the depth range 15–45 km, generally reaching a maximum depth of 20 km in the west and 45 km in the centre of the arc, near Crete. 
Meaning of the word marked with <WSD> tags:  The process of one tectonic plate moving beneath another and sinking into the mantle at a convergent plate boundary.