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Ulawun volcano (New Britain, Papua New Guinea) - Smithsonian / USGS Weekly Volcanic Activity Report for 31 July-6 August 2019 (New Activity / Unrest)

Ср, 31 июл 2019, 06:00
06:00 AM | ПЇЅПЇЅПЇЅПЇЅПЇЅ: VN
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.
During the night of 2-3 August crater incandescence strengthened and roaring noises became louder around 0400. An eruption began between 0430 and 0500 on 3 August; booming noises commenced around 0445. By 0600 dense light-gray ash emissions were drifting NW, causing ashfall in areas downwind including Ulamona Mission.
Ash emissions continued through the day and grew from light to dark gray with time. The eruption intensified at 1900 and a lava fountain rose more than 100 m above the crater rim. A Plinian ash plume rose 19 km and drifted W and SW, causing ashfall in areas downwind such as Navo and Kabaya, and as far as Kimbe Town.

The Darwin VAAC reported that the ash plume expanded radially and reached the stratosphere, rising to 19.2 km (63,000 ft) a.s.l. The plume then detached and drifted S and then SE.



The Alert Level was raised to Stage 3 (the second highest level on a four-stage scale). The areas most affected by ash and scoria fall were between Navo (W) and Saltamana Estate (NW). Two classrooms at the Navo Primary School and a church in Navo collapsed from the weight of the ash and scoria; one of the classroom roofs had already partially collapsed during the 26 June eruption.
Evacuees in tents as a result of the 26 June eruption reported damage. Rabaul town (E) also reported ashfall. Seismicity declined rapidly within two hours of the event, though continued to fluctuate at moderate levels.
According to a news source flights in and out of Hoskins airport in Port Moresby were cancelled on 4 August due to tephra fall. The Alert Level was lowered to Stage 1. Small amounts of white and gray vapor were emitted from the summit crater during 4-6 August.

Sources: Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC), Radio New Zealand, Papua New Guinea Post-Courier Online
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From: Global Volcanism Program, 2019. Report on Ulawun. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 31 July-6 August 2019. Smithsonian Institution and US Geological Survey.

Предыдущие новости

Wed, 3 Jul 2019, 06:00
RVO reported that diffuse white plumes rose from Ulawun's summit crater and the North Valley vent during 1-4 July, and from the summit only during 5-9 July. The seismic station located 11 km NW of the volcano recorded three volcanic earthquakes and some sporadic, short-duration, volcanic tremors during 1-3 July. The seismic station 2.9 km W of the volcano was restored on 4 July and recorded small sub-continuous tremors. ... Read all
Thu, 27 Jun 2019, 06:11
Current ash cloud forecast for the remnant ash ejected during the major eruption of Ulawun volcano yesterday (image: VAAC Darwin)
The activity at the volcano seems to have decreased a lot or ceased last evening at the end of the very violent eruptive phase. ... Read all
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