Most earthquakes occur within the Earth's crust, which is the outermost layer of the planet.

Here's a breakdown of earthquake depths:

* Shallow earthquakes: These are the most common type and occur at depths of 0-70 km (0-43 miles).

* Intermediate earthquakes: These occur at depths of 70-300 km (43-186 miles).

* Deep earthquakes: These are less common and occur at depths of 300-700 km (186-435 miles).

While some deep earthquakes can occur at depths exceeding 700 km, they are relatively rare.

It's important to note that the depth of an earthquake is a significant factor in its intensity and potential damage. Shallow earthquakes tend to be more damaging than deep earthquakes because the seismic waves have less distance to travel and lose less energy.