OTHER ERUPTION PHENOMENA

Stated by PHIVOLCS there are other Eruption Phenomena. These are the following;

Debris avalanche

fast downhill movement of soil and rock, speed: 70 km/hr (due to high water content and steep slopes) caused by slope failure on the cones of stratovolcanoes.

Hydrothermal explosions

explosions from instantaneous flashing of steam upon contact with hot rocks

Secondary explosions are caused by the contact of water with hot pyroclastic flow deposits.

Subsidence

is a ground deformation resulting from the downward adjustment of surface materials to the voids caused by volcanic activity.

This may result also from mine workings or geothermal water or oil extraction.