Recent sand volcanoes in the sand of a dike under construction



Sand volcanoes are small volcano-like features. They range in diameter from a few centimetres to several metres. Five volcanoes with a maximum diameter of 2 m were observed during the construction of a dike on the coast of Northwestern Germany. The cones reached heights of about 15 cm with craters in the middle.

The rise of the volcanoes is explained by de-watering of sediment.