Agung volcano (Bali, Indonesia): increasing seismic activity
Fri, 13 Oct 2017, 22:4922:49 PM | BY: T
Current seismic plot from VSI's TMKS station showing a swarm of quakes under Agung and possibly some tremor (thicker baseline)
The likelihood of an eruption of the volcano in the near future remains high. Seismic activity is unchanged at very elevated levels, with averages of around 8-900 earthquakes per day.
Recent seismic activity at Agung
Swarms of volcanic quakes likely reflect rock fracturing events by internal fluid pressure as magma intrudes the edifice at shallow depths. An increase in quakes occurred this evening (early morning in Bali) and can be seen on the seismogram.
In addition, weak episodes of non-harmonic volcanic tremor have begun to occur during the past days as well; while it is not completely understood what causes the various types of volcanic tremor, the common interpretation is that internal movements of magma cause oscillations of the fluid and its conduits (in a similar way as passing air in organ pipes causes resonance).
At the surface, the volcano remains however more or less calm. Only a small white steam plume can be seen rising from the crater. An attempt to survey the crater with a drone yesterday failed as the device crashed on its ascent.
There are unconfirmed reports from people in the area who told in posts on facebook and other media that animals have started to show unusual behavior. How significant and reliable such reports are is questionable.
Sun, 8 Oct 2017, 13:38
The situation of the volcano remains unchanged and continues to be critical: based on available monitoring data, the volcano could (but not necessarily will) erupt at any time with little further precursors. ... Read all