Question

An earthquake with a hypocenter depth exceeding 300 km is known as:

• A. Shallow-focus earthquake
• B. Intermediate-focus earthquake
• C. Deep-focus earthquake
• D. Surface-focus earthquake

Hint:

Depth>300 km = deep-focus earthquake; occurs mostly in subduction zones.

Answer 1

The Correct Option is C

Earthquakes are classified based on depth of the focus (hypocenter):
- Shallow-focus: 0–70 km
- Intermediate-focus: 70–300 km
- Deep-focus: >300 km
Thus, a focus depth exceeding 300 km is categorized as a deep-focus earthquake.