A '' ' cryptodome ' '' ( from Greek κρυπτός , '' kryptos '' , " hidden , secret " ) is a dome-shaped structure created by accumulation of viscous magma at a shallow depth . One example of a cryptodome was in the May 1980 eruption of Mount St. Helens , where the explosive eruption began after a landslide caused the side of the volcano to fall , leading to explosive decompression of the subterranean cryptodome
1980 eruption of Mount St. Helens
1980 eruption of Mount St. Helens
Lava dome