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Sinabung volcano
Stratovolcano 2460 m (8,071 ft)
Sumatra, Indonesia, 3.17°N / 98.39°E
Current status: restless (2 out of 5)
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Sinabung volcano eruptions:
2013-ongoing, 2010
Typical eruption style:
Explosive
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Sinabung volcano (Sumatra): eruption news and activity updates

Sinabung volcano (Sumatra, Indonesia): volcanologists believe increased magma supply

Tuesday Aug 11, 2015 09:48 AM | BY: T

Map of Sinabung with the exclusion zone
Map of Sinabung with the exclusion zone
According to a news article in the Indonesian press, volcanologists monitoring Sinabung believe that magma supply to the growing lava dome has recently increased.
This will likely result in more and larger pyroclastic flows that can threaten a number of villages that so far have been unharmed. These include Pasarpinter Gurkinayan, Simpang Sibintun, Perjumaan Batukejan, Jembatan Lau Benuken Tigapancur, Pejuman Tigabogor, Pentumbes, Jeraya, and Kutatengah on the SE slope.
The volcano is kepts at the highest alert status ("awas" or 4 out of 4) and an exclusion zone of 7 km is kept in place.
At the same time, only smaller collapse events and a small pyroclastic flow on 7 Aug have occurred during the past week. Most of the previous lava dome and its dangerous lobes clinging onto the steep upper slopes had been destroyed by the collapses in late July and the first days of August.
This apparent calm, however, could make things only worse, as it gives a false sense of safety. Indonesian volcanologist warn that there should be no activities inside the 7 km radius zone (something which is not being observed at all, however).
The evaluation of the situation comes from a drastic increase of certain kinds of earthquakes detected under the volcano, so called low-frequency events that are indicators of internal fluid movements. Their numbers rose from a few events per day to several hundred on Saturday - a clear sign that something had changed inside the volcano, likely a batch of new magma had started to move towards the vent.
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Links / Sources:
Previous news
Pyroclastic flow from Sinabung today (image: Samri Sihombing / facebook)
Tuesday, Aug 04, 2015
At least two pyroclastic flows occurred today at the volcano, continuing the destruction of the steeply emplaced lava lobes on the upper SE and E side. ... [more]
Pyroclastic flow at Sinabung volcano yesterday (image: Mbah Lëwå / facebook)
Friday, Jul 31, 2015
A series of small to medium-sized pyroclastic flows occurred yesterday as a result of the ongoing destruction of the unstable lava lobe present on the upper eastern flank. ... [more]
Pyroclastic flow at Sinabung volcano this morning
Tuesday, Jul 28, 2015
A series of pyroclastic flows yesterday noon (see previous post) and this morning destroyed a part of the eastern lava lobe. ... [more]
Pyroclastic flow at Sinabung volcano today at 12:22
Monday, Jul 27, 2015
Activity has remained essentially unchanged. Effusion of viscous lava continues at slow pace to feed the lava dome with two active lobes on the SE and E upper flanks. At 12:22 local time today, a small part of the eastern lobe collapsed into a medium-sized pyroclastic flow that traveled approx. 2.5 km towards the outskirts of the (already evacuated and destroyed) villages of Bekerah and Simacem. ... [more]
Incandescence from the two lava lobes of Sinabung and a rockfall at night (25 July)
Sunday, Jul 26, 2015
During the past 2,3 days, the volcano has been relatively calm and not produced pyroclastic flows, only small rockfalls from two lava lobes, a smaller and a much larger one, overspilling to the SE and ENE, respectively ... [more]

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