Agung (Indonesia) - Report for 7 February-13 February 2018

On 10 February PVMBG reported that activity at Agung had declined during the previous month or two leading the observatory to lower the Alert Level to 3 (on a scale of 1-4) and adjusted the exclusion zone to a 4-km radius.
The report noted that the tallest eruption plume in January was 2.5 km above the crater rim, occurring on 19 January, and the last event on 24 January generated a plume that rose 1 km.
The volume of erupted lava was an estimated 20 million cubic meters in December 2017, and had not significantly changed.
Seismicity continued to fluctuate, though the number and magnitude of events had declined.
Satellite data showed a decrease in thermal output reflective of a reduced lava flow rate.
PVMBG warned that activity at Agung is still high and unstable; tiltmeter data showed low rates of inflation (GPS patterns were stable) and gas-emission data indicated magma movement at depth, though at a lower intensity compared to values measured at the end of November 2017.
An event at 1149 on 13 February generated as ash plume that rose 1.5 km above the crater rim.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Fonte/Source: Global Volcanism Program/Smithsonian Institution


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