The status of Mount Anak Krakatau Rises from Warning (Level II) to Caution (Level III),Residents are Appealed Away from Radius 5 km from Crater Thursday, December 27, 2018

  • 2018.12.27 Thursday
  • 19:32


EMR Communication Team





 NUMBER: 0081.Pers / 04 / SJI / 2018

 Date: December 27, 2018


The status of Mount Anak Krakatau rises from Warning (Level II) to Caution (Level III), Residents are Appealed to stay away from the Radius 5 km from the Crater


Based on the observation of Mount Anak Krakatau activity in the Sunda Strait until this morning (27/12), the Center for Volcanology and Geological Disaster Mitigation (PVMBG), the ESDM Geological Agency increased the activities of Mount Anak Krakatau from Level II (Warning) to Level III (Caution) counted at 06.00 WIB.


At a press conference at the Ministry of Energy and Mineral Resources Building Jakarta, Thursday (12/27), the Secretary of the Geology Agency Antonius Ratdomopurbo (Purbo) said that the status progress was based on observations and analysis of visual and instrumental data until December 27, 2018 at 05:00 WIB .

"Regarding the level of Level III (Caution) activity, people are not permitted to approach Mount Anak Krakatau within a radius of 5 km from the crater. When ash falls, people are asked to wear masks and goggles when doing activities outside the home," said Purbo.


He asked the people in the coastal areas of Banten and Lampung provinces to remain calm and be able to carry out activities as usual by always following the direction of the local BPBD.

Previously, on December 26, it was reported that there was rain of volcanic ash in several regions, namely in Cilegon, Anyer and Serang. The PVMBG Emergency Response Team has conducted a field check, to confirm the incident and conduct a sampling of falling volcanic ash.


Regarding the potential disaster of the Mount Anak Krakatau eruption, the Disaster Prone Area Map (KRB) shows that almost the entire body of Mount Anak Krakatau, which is approximately 2 km in diameter, is a disaster-prone area. The potential danger from the activities of Mount Anak Krakatau at present is throwing incandescent material, lava flows from the center of the eruption and hot clouds that point to the south. While the spread of volcanic ash depends on wind direction and speed.


Observation of Increasing Activity of Mount Anak Krakatau


Mount Anak Krakatau, located in the Sunda Strait, is a type A volcano and is a young volcano that appears in the caldera, after the paroximal eruption in 1883 from the Krakatau volcanic complex. Eruption activities after the formation began in 1927, when the volcanic body was still below the sea surface. The body of the Anak Krakatau has surfaced since 1929. Since then and until now Mount Anak Krakatau is in the construction phase (building its body to large).

At present Mount Anak Krakatau has the highest elevation of 338 meters from the sea level (measurements in September 2018). The eruption character is a magmatic eruption in the form of a weak explosive eruption strombolian and an effusive eruption in the form of lava flow. In 2016 the eruption occurred on June 20, 2016, while in 2017 the eruption occurred on February 19, 2017 in the form of a strombolian eruption. Since June 29, 2018, Mount Anak Krakatau has again issued an eruption until December 22 in the form of a strombolian eruption.


On December 22, as usual in previous days, Mount Anak Krakatau issued an eruption. Visually, eruptions with high smoke ranged from 300 - 1500 meters above the top of the crater. In seismicity, earthquake tremors are recorded continuously with overscale amplitude (58 mm). At 9:03 am, an eruption occurred, and after a long time there was tsunami information. Based on satellite imagery received by PVMBG, most of the body of Mount Anak Krakatau has been lost, which was later known to cause tsunamis in several areas in Lampung and Banten provinces.


After the tsunami, the activity of Mount Anak Krakatau remained high. Visually the volcano is clearly visible until it is covered in fog. It was observed that the main gray-to-black crater smoke with a thin intensity up to a height of about 500 meters from the summit with winds blowing weakly to moderate towards the north and southwest. Seismicity is still dominated by continuous tremor with an amplitude reaching 32 mm (dominant 25 mm).


The progress of December 22-26 2018, observed the smoke of the main craters gray to black with a thin intensity to high thickness around 200-1,500 meters from the peak. Based on data from Sentinel Image on December 11, 2018 and December 23, 2018, it can be seen that some of the West to South sector slopes appear to have experienced landslides as shown by the comparison of images before and after the tsunami . During this period there was a continuous tremor earthquake with amplitude 08-31 mm, dominant 25 mm.


On December 26, 2018 the eruption took the form of hot clouds and surtseyan. This hot cloud which resulted in ash rains including those recorded on December 26, 2018 at 17.15 WIB. From the Kalianda Post, at 12p.m. reported a high intensity roar. (sk)


Head of Communication Bureau, Public Information Services, and Cooperation

Agung Pribadi

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Head of Communication Bureau, Public Information Services and Cooperation

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