Key Points
* Earthquake Depth and Plate Boundaries: Earthquakes are most common along tectonic plate boundaries because these are zones of intense geological activity. The depth of an earthquake provides clues about the type of plate boundary and the processes occurring there.
* Shallow Earthquakes: Occur at or near the Earth's surface.
* Divergent Boundaries: Where plates move apart (e.g., mid-ocean ridges) shallow earthquakes are common.
* Transform Boundaries: Where plates slide past each other (e.g., San Andreas Fault), shallow earthquakes are also common.
* Intermediate and Deep Earthquakes: Occur at depths of 70 to 700 km.
* Convergent Boundaries: Where plates collide (e.g., subduction zones) are the only place where intermediate and deep earthquakes happen. This is because one plate is forced under the other (subducted). The process generates friction and heat, leading to earthquakes at depths where rocks are still brittle enough to fracture.
In Summary:
* Shallow Earthquakes: Divergent and Transform boundaries
* Intermediate & Deep Earthquakes: Convergent boundaries (subduction zones)
Let me know if you'd like more details on specific types of plate boundaries!
