What relationship exists between the depths of the earthquake foci and latitude?

The depth of earthquake foci often correlates with tectonic plate boundaries, which are influenced by latitude. Generally, earthquakes at mid-ocean ridges (often found at lower latitudes) tend to be shallow, while those occurring at subduction zones (often at higher latitudes) can be much deeper. This pattern reflects the geological processes associated with different tectonic settings, where the angle of subduction and the nature of the interacting plates play a significant role in determining focus depth. However, exceptions exist, and local geological conditions can also affect this relationship.