You might be thinking what the hell is a pseudocrater? Pseudo drugs, pseudoscience, does that mean it’s a fake crater? Well yes kind of. Fake in the way it looks like a volcanic crater, but actually isn’t. They are however created in volcanic eruptions.
What happens is when lava is flowing to create a lava field, sometimes the lava will flow over wet ground, swamps or even a lake. The water below then heats up and creates eruptions of steam that burst through the lava. These craters were often thought to be actual craters before. Countless pseudo craters can be found in and around Lake Mývatn in Iceland and some well known ones can be found in the Rauðhólar (E. Red Hills) area in Reykjavík.
Pseudocrater Isle by Zanthia on Flickr.