Ash eruptions are reported in the first half of the 19th century . 1913 and 1959 glow was observed in the summit crater, and a phreatic eruption was reported in 1960.
42.
Scientists flying over the volcano on March 8, 2012 noted fresh ash deposits on the east flank of the volcano near the crater, likely from an phreatic eruption on February 22.
43.
At 2 : 25pm on February 11, the workers encountered volcanic gases, which were quickly followed by a phreatic eruption on Mount Yake, leading to the death of four people.
44.
Its last known eruption was registered in 1986 a small phreatic eruption in May but it is still considered as dangerous to more than 250, 000 people residing in the area.
45.
The only known historical volcanic activity at Biliran was a phreatic eruption and possible debris avalanche at a thermal area on September 26, 1939 . There are five active solfatara fields on the island.
46.
The explosive gases break through the lava surface in a manner similar to a phreatic eruption, and the tephra builds up crater-like forms which can appear very similar to real volcanic craters.
47.
After four months of volcanic earthquakes, small phreatic eruptions began on 18 September 1943, breaking through a layer of highly metamorphosed rocks, before the first major explosion occurred on 27 December 1943.
48.
The third eruptive type is the phreatic eruption, which is driven by the superheating of steam via contact with magma; these eruptive types often exhibit no magmatic release, instead causing the granulation of existing rock.
49.
Historical eruptions at Raoul during the 19th and 20th centuries have sometimes occurred simultaneously from both calderas, and have consisted of small-to-moderate phreatic eruptions, some of which formed ephemeral islands in Denham caldera.
50.
By the time of the climactic eruption, dacite magma intruding into the volcano had forced the north flank outward nearly and heated the volcano's groundwater system, causing many steam-driven explosions ( phreatic eruptions ).
