Ulawun (Papua New Guinea) weekly volcanic activity report 25 September-1 October 2019
Thu, 3 Oct 2019, 10:2110:21 AM | BY: MARTIN
Alert Level raised to Stage 3
Source: Terra satellite
Periods of volcano-tectonic earthquakes slowly transformed into continuous tremor with distinct bursts of high-frequency signals marking discrete volcano-tectonic events during 0430-0500 on 1 October. During this time a new vent opened in a deep valley on the SSW flank at 700 m elevation.
The eruption was described as a distinct incandescent glow formed from ejecting material rising less than 100 m above the vent. By dawn light-gray ash plumes were visible rising several hundred meters and drifting NW. Lava fountaining continued throughout the day, and gray ash plumes rose several kilometers above the vent and drifted W. RVO recommended that the Alert Level be raised to Stage 3.
On 2 October lava fountains rose several hundred meters and ash-and-steam plumes rose to variable heights between 2 and 5 km, causing ashfall in Navo (W). A lava flow which emerged during the night traveled 1-2 km NW, though visibility was hindered due to weather conditions. Loud rumbling and roaring was noted. Seismicity remained high with RSAM values passing 12,000 units.
Source: Smithsonian / USGS Weekly Volcanic Activity Report 25 September-1 October 2019
Thu, 3 Oct 2019, 06:00
Ulawun Volcano Volcanic Ash Advisory: VA TO FL100 MOV N. LAST OBSERVED AT 03/0000Z. to 10000 ft (3000 m)