JAKARTA (Oct 4, 2011): The drastic increase in volcanic earthquake activities at Anak Krakatau has forced authorities to warn of a possible eruption.
All quarters have been asked not to approach within a two-kilometre radius of the volcano, located in the Sunda Strait. Normal activities are still allowed outside the radius.
Anak Krakatau is 40km from the coast of Lampong, Sumatera, and the coast of Anyer-Carita coast, Jawa.
Local media quoted Head of Volcanology and Geology Disaster Mitigation Centre, Surono, yesterday that the seismograph recorded between 6,000 and 7,000 volcanic earthquakes a day.
Prior to this, the seismograph only recorded between 100 and 300 volcanic events a day, said Surono to Indopos, as quoted by news portal Jawa Post National Network.
Antara news agency quoted Andi Arief, Special Presidential Staff Disaster Areas Social Disaster Assistant, that, in theory, anything more than 1,000 earthquake activities could cause Anak Krakatau to erupt.
He said the type of eruption has yet to be ascertained because developments are still at the intensive monitoring level.
Since Anak Krakatau appeared on the surface of the sea on June 11, 1927, the volcano has erupted more than 100 times, with a dormant period of between one to six years.
The explosive eruption of Anak Krakatau last July 10 hurled hot ash into the sky to a radius of 700 to 1,000 metres from the centre of the eruption, causing damage to seismic equipment placed at the volcano.
The explosive eruptions which took place in the last four years were the magmatic type, throwing volcanic material and dust for 1,000 to 1,500 metres around Anak Krakatau.
How wide the volcanic dust was spread, however, depended on the strength and direction of the wind. – Bernama