It along plate margins. Where plates collide, run along side each other or if one subducts under another, If it gets caught/jammed, over time pressure builds and eventually it gives way, BOOM! The pressure is released as an earthquake. I guess inside the earth, the mantle is included but not hugely. Plates subducting might may cause friction to build up and cause the rock to melt and/or when it subducts into the mantle. But as it does, the pressure builds up again which will in tern cause a volcanic eruption.
I'll just add the 3 types of movement here: They are:
Periodic Movement
Cyclic Movement
Permanent Migration
Arranged in order from shortest to longest duration, it will be like this:
Cyclic Movement
Periodic Movement
Permanent Migration
Hope my answer has helped.
Latitude: <span>It's in the northern hemisphere
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Proximity to Water: <span>It's 300 miles from the sea</span>