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…

Okmok – Another Aleutian Caldera

We here in Alaska tend to pay attention to volcanic activity, partly because parts of the state get regularly dusted, and partly because Alaska was home to one of the largest eruptions in the 20th Century – Katmai – Novarupta a century ago.  As you travel down the Alaska Peninsula into the Aleutians, you run…