The Quaternary age Gas Rocks dacite domes some three km to the northeast were the site of a phreatic eruption some 2300 years ago.
32.
Four major phreatic eruptions have occurred during the past 5, 000 years, two of them in historical time, in 806 and 1888.
33.
Other signs of a forthcoming eruption included increased fumarole activity, deposition of sulfur on the summit of the volcano, and small phreatic eruptions.
34.
Increased fumarole activity, deposition of sulfur on the summit of the volcano, and phreatic eruptions also alerted geologists to the possibility of an eruption.
35.
On 18 November 2013 Mount Merapi burst smoke up to 2, 000 meters high, one of its first major phreatic eruptions after the 2010 eruption.
36.
In the 1870s it was deep; after a phreatic eruption nearby in 1880, the lake disappeared and formed a fountain of hot water and steam.
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He surmised that phreatic eruptions do not exhibit an acceleration in deformation before taking place and left after confirming that the volcano's monitoring system functioned properly.
38.
Kilauea, in Hawaii, has a long record of phreatic explosions; a 1924 phreatic eruption hurled rocks estimated at eight tons up to a distance of one kilometer.
39.
Another phreatic eruption lowered the lake level by some from December 2004 to April 2005; later the lake level rose again, refilling the lake in just one day.
40.
Further advisories were given to low-flying aircraft against the dangers of sudden phreatic eruptions, and to local residents near rivers and streams in case of lahar flows.
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