This diagram shows typical fault locations and sizes.
(1) Shallow earthquakes that occur on active faults, etc., (depths of 0-20 km).
(2) Earthquakes that occur at the boundary of the land plate and the subducting Philippine Sea Plate (depths 20-50 km).
(3) Earthquakes that occur within the subducting Philippine Sea Plate (depths 20-50 km).
(4) Earthquakes that occur at the boundary of the subducting Philippine Sea Plate and the Pacific Plate (depths 50-100 km).
(5) Earthquakes that occur within the subducting Pacific Plate (depths 50-100 km).