2 part question: Do you think it's likely to find andesitic rokcs close to regionally metamorphosed rocks, or

Question

should these two rock types be widely seperated? Why?

2. Earthquakes, are the result of sudden motion in the Earth, caused by abrupt release of slowly accumulated stress, cause rocks to fracture or fault. How does such faulting relate to horizontal movement of plates. Where does this type of movement occur?

Answer 1

First, this seems like it's posted in the wrong category, but oh well. I think you can have andesitic rocks near regionally metamorphosed rocks because the andesitic rocks are typically from island arc volcanoes and you can get regionally metamorphosed rocks from the subducted slab that's generating the andesitic volcanism. You just need something (a collision perhaps?) to bring the metamorphosed subducted material to the surface.

For the second part of the question, faulting may occur where plates are moving past each other horizontally, as in the San Andreas and associated faults in California. Spreading centers (e.g. mid-Atlantic ridge) can also generate horizontal faulting because if there's an offset in the ridge axis the sections will be sliding past each other horizontally generating fracture zones. This type of faulting is less common in subduction zones, there the earthquakes are usually caused by dip-slip faulting.