GENERAL GEOLOGY

Detailed explanation-1: -Shallow earthquakes are between 0 and 70 km deep; intermediate earthquakes, 70-300 km deep; and deep earthquakes, 300-700 km deep. In general, the term “deep-focus earthquakes” is applied to earthquakes deeper than 70 km.

Detailed explanation-2: -Earthquake-Shallow, intermediate, and deep foci | Britannica.

Detailed explanation-3: -The focus is the place inside Earth’s crust where an earthquake originates. The point on the Earth’s surface directly above the focus is the epicenter.

Detailed explanation-4: -Shallow depth of field keeps a small area of your photo in focus and blurs the rest, whereas deep depth of field maintains focus throughout the photo. You can adapt focus with depth of field by changing your aperture, length of your lens, and your subject’s position.