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Ulawun volcano (New Britain, Papua New Guinea) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 September-1 October 2019 (New Activity / Unrest)

Ср, 25 сен 2019, 06:00
06:00 AM | ПЇЅПЇЅПЇЅПЇЅПЇЅ: VN
RVO reported that small, discrete, volcano-tectonic earthquakes at Ulawun began occurring more regularly around 1000 on 30 September; by 1130 they were frequent and by 1220 they were characterized as a swarm. The magnitude of the events overall increased with time and some were felt by residents and accompanied by booming sounds. Events were less frequent and intense during 1730-1930.
Sometime afterwards RSAM values erratically increased, reaching a high of 10,000 units between 0130 and 0200 on 1 October. The Alert Level was raised to Stage 2 (the second lowest level on a four-stage scale).



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: Rabaul Volcano Observatory (RVO)
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From: Global Volcanism Program, 2019. Report on Ulawun. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 September-1 October 2019. Smithsonian Institution and US Geological Survey.

Предыдущие новости

Wed, 7 Aug 2019, 12:05
RVO reported that during 1-2 August white-to-grayish vapor plumes rose from Ulawun's summit crater and drifted NW. Incandescence from the summit crater was visible at night and jetting noises were audible for a short interval. RSAM values fluctuated but peaked at high levels. ... Read all
Wed, 7 Aug 2019, 06:00
RVO reported that during 7-8 August minor emissions of white vapor rose from Ulawun's summit crater. Seismicity was dominated by low-level volcanic tremor and remained at low-to-moderate levels. RSAM values fluctuated between 400 and 550 units; peaks did not go above 700. ... Read all
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