Why are subduction zones curved?

One of the most prominent features when looking on the large-scale topography of Earth are subduction zones. Since I have often wondered why they usually are arc-shaped I decided to delve a bit into the topic and share my findings in this post. It is mainly from a perspective of a geometrical model proposed in  “Why…

Originally posted on lithics:
Earlier I posted an info bulletin about this morning’s Banda Aceh earthquake.  Rather than muddle it with more and more stuff, I thought it might be better to include this update as a separate post, as it is more of a discussion than a news piece in any case. The truth…

Earthquake – Focal beach balls

Stand in the place where you live Now face North Think about direction Wonder why you haven’t before Now stand in the place where you work Now face West Think about the place where you live Wonder why you haven’t before If you are confused check with the sun Carry a compass to help you…