Explanation:

Shallow focus earthquakes are called crustal earthquakes as they exist in the earth’s crustal layer. Shallow focus earthquakes (most common at submarine ridges. Hardly felt). Examples are earth quakes at mid-ocean ridges.Deep focus earthquakes are known as intra plate earthquakes, as they are triggered off by collision between plates. Benioff zone is a zone of seismicity corresponding with the downgoing slab in a subduction zone (Convergent Boundary). Deep focus earthquakes (Occurs at trenches – convergent boundary. Very powerful. Japan lies along trench line. Hence it faces devastating earthquakes). Examples are alpine-Himalayan belt.Shallow-focus earthquakes occur at depths less than 70 km, while deep-focus earthquakes occur at greater focal depths of 300 – 700 km.Shallow focus earthquakes are found within the earth’s outer crustal layer, while deep focus earthquakes occur within the deeper subduction zones of the earth.Shallow focus earthquakes are of smaller magnitudes, of a range 1 to 5, while deep focus earthquakes are of higher magnitudes, 6 to 8 or more.