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

Tue, 11 Aug 2015, 09:48
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.

Previous news

Wed, 5 Aug 2015, 06:00

Sinabung volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 5 August-11 August 2015 (Continuing Activity)

Based on weather models and information from PVMBG, the Darwin VAAC reported that on 6 August ash plumes from Sinabung rose to an altitude of 6.5 km (21,300 ft) a.s.l. and drifted about 35 km ESE. On 10 August an ash plume rose to an altitude of 4.3 km (14,000 ft) a.s.l. ... Read all
Tue, 4 Aug 2015, 15:56

Sinabung volcano (Sumatra, Indonesia) update: pyroclastic flow

Pyroclastic flow from Sinabung today (image: Samri Sihombing / facebook)
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. Read all
Show more
Sinabung volcano
Stratovolcano 2460 m (8,071 ft)
Sumatra, Indonesia, 3.17°N / 98.39°E
Current status: restless (2 out of 5) Sinabung volcano eruptions:
2013-ongoing, 2010
Typical eruption style
Explosive
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