A summary of precursors to volcanic eruptions in Papua New Guinea. Both of these were small. On 10 June a discrete event produced an ash plume that rose to 2.1 km (7,000 ft) a.s.l. The activity was stronger 23-26 September and a steady night glow was visible 25-26 September. Crater 3 was active during the first nine days of the month. Lava flows that began 6 March ceased on 1 April. Ash plumes rose to altitudes of 1.8-3.3 km (5,900-10,800 ft) a.s.l. The intensity of explosions during the rest of the month was much lower, but the amount of ash emitted remained steady. During November, ashfalls reached 10-15 km on the N-NW flank; these eruptions were accompanied by audible explosions and rumbling. "Ashfalls were reported in inhabited areas about 10 km N and W of the volcano on about 50% of days during the first half of October. Table 6. Background activity consisted of release of small volumes of white vapour from Crater 2, with occasional deep, low rumbling noises.
Vulcanian activity occurred from Crater 2 throughout September and the first week of October. Occasional explosion earthquakes and glow, "There was a slight increase in March in the overall low level of inter-eruptive activity since the last significant eruption in March-May 1986 (SEAN 11:3-5). Small quantities of ash fell at the observation post . Glow and incandescent tephra ejections were observed at Crater 2 most nights the first half of the month, occasionally the second half. and drifted SE. Strong explosions continue; incandescent tephra, "Strong eruptive activity continued during December although a decline was apparent in the last week of the month. Crater 3 released weak white vapor throughout the month. This type of activity, with plume heights around 600 m, continued with minor variations until the end of October. On 25 October an ash cloud that rose to 2 km above the crater deposited ash toward the N. Likewise, at 0655 on 26 October a thick, white vapor plume was accompanied by an ash column that rose to 1 km above the crater rim. Crater 2 released white and blue vapors during 1-18 October; from 6 to 9 October the emissions were accompanied by weak rumbling noises. RVO reported that emission of ash and white vapor plumes from Langila's Crater 2 continued during 1 August-30 September. and drifted N and NW. This lobe was fresh, having a dark surface, and its source appeared to be a tube within the E lobe.
At Crater 2, background levels of moderate white and blue vapour emissions continued, and very weak night glow was seen on 7 September. . At times the eruption was marked by moderate to strong emissions of thick gray-brown ash clouds occurring at irregular intervals. "Activity at Crater 3 was mild for the first half of the month, with moderate or weak emission of thin white vapour. The seismograph was not operational during January.". Seismicity remained low and only 9 explosion earthquakes were recorded.". ", Ashfalls; incandescent tephra; discontinuous tremor. Crater 2 continued weak-to-moderate emissions of white vapor during both months. An extensive lava field reaches the coast on the N and NE sides of Langila. "After 5 months of mild activity, stronger eruptions resumed in mid-October from both Craters 2 and 3. Another plume became visible on imagery on 16 June moving W at 30 km/hour at an estimated altitude of ~ 3 km; ongoing plumes became hard to see about mid-day on 17 June. "The ash plume from the combined emissions of the craters was usually directed in a sector between NNE and NW. . Steady weak red crater glow was observed on clear nights, with incandescent lava ejections occurring on 21 and 22 March. and drifted N. On 1 November the plumes were accompanied by forceful white vapor plumes, and roaring noises were heard at regular intervals. Emissions consisted of weak white vapors from Crater 2 for most of the month. Langila was relatively quiet throughout January. ", Eruption column to 6-7 km altitude; nuées ardentes. Weak red glow from Crater 2 was seen on the nights of 10 and 11 June. Low explosion noises were also heard on the 29th. Seismic activity strengthened considerably. "Crater 3 has shown declining activity since April when occasional explosions were seen. The level of activity was slightly lower than in March. Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that during 24-27 May ash plumes from Langila rose 2.1-3 km (7,000-10,000 ft) a.s.l. No seismic recording took place during the month. According to the Darwin VAAC, low-level ash plumes emitted from Langila were visible on satellite imagery during 8-13 June 2005. Talawe is the highest volcano in the Cape Gloucester area of NW New Britain. . Rumbling and/or explosive sounds were heard on most days. At the times of the strongest emissions however, up to four vents erupted concurrently with a deafening jet engine noise, generating air and ground vibrations recorded by the summit seismic station as emergent periods of tremor-like signals. . The explosions produced dark grey vapour and ash clouds or columns, resulting in light ashfalls over the NW flank of the volcano and to coastal villages (10-15 km distant). Langila volcano is located 11 km south of Cape Gloucester, West New Britain. Night glow was observed at Crater 2 on 14 and 15 January; some of the glow on the 15th changed into weak incandescent lava projections. 2020-10-24 10:15 original message : received fvau02 at 10:14 utc, 24/10/20 from adrm va advisory dtg: 20201024/1015z vaac: darwin volcano: langila 252010 psn: s0532 e14825 area: papua new guinea summit elev: 1330m advisory nr: 2020/18 info source: himawari-8 aviation colour code: orange eruption details: va to fl070 mov n 05kt obs va dtg: 24/1015z obs va cld: … A dense ash cloud was erupted at about 1930 on the 12th. The largest of these explosions (recorded by the nearby seismometer) totaled as many as 35/day. Based on analyses of satellite imagery and model data, the Darwin VAAC reported that during 23 and 26-28 May ash plumes from Langila rose to altitudes of 2.4-3 km (8,000-10,000 ft) a.s.l. The level of seismic activity remained steady, and consisted of moderate-amplitude volcanic earthquakes, probably of explosion origin. Seismic levels remained moderate. "On most days in August ash-laden vapour emissions from Crater 2 were blown down the volcano's flanks by strong winds, obscuring both the active vent and Crater 3. The activity consisted of moderate emissions of thin-to-thick white vapor, which were occasionally accompanied by gray ash clouds. Seismographs remained inoperative. Crater 2 produced thick white emissions while Crater 3 released white or blue vapours. The tremor became strong enough to be recorded at both the summit station (LAN) and the 9-km-distant CGA station. The most violent, 11-14 and 22-24 January, ejected incandescent boulders and tephra, illuminating the dark ash-laden column and setting fire to vegetation on the volcano's flanks. Ashfalls were reported in areas N and NW of the volcano. The ash clouds were blown to the NW and produced light ashfall. The Darwin VAAC reported that another ash plume was seen in MTSAT-2 visible imagery on 5 December that rose to an altitude of 2.1 km and drifted 110 km NW. Langila, one of the most active volcanoes of New Britain, consists of a group of four small overlapping composite cones on the lower eastern flank of the extinct Talawe volcano. A number of low-frequency explosion earthquakes (2-9) were recorded daily, some of which were accompanied by loud detonations heard at the the observation post . Incandescent fragments were ejected from the summit on 21-22 September. although there was an increase toward the end of the month. Information Contacts: P. Lowenstein and B. Talai, RVO. Some of these explosions were large enough to be recorded by a seismometer 9 km away. ", "Activity consisted of weak to moderate white-grey emissions from Crater 2. "For most of April, activity was at a low level with weak to moderate white and occasionally grey emissions from Crater 2, and weak white and rarely blue emissions from Crater 3. Explosion and rumbling sounds were heard occasionally. There was no activity at Crater 3. One on 13 November was reported by a passing aircraft pilot as rising to about 6-7 km altitude, and having a columnar appearance. Seismic activity declined from a peak reached near the end of July, but the character of the activity was unchanged. . During 2013, seven anomalies were reported during 23 October-1 December (4 pixels on 25 October); during 2014-2015, a possible anomaly was identified on 23 August 2014 NE of the crater and thus probably not associated with volcanic activity. Langila represents an eastward migration of Mt Talawe eruption centre. ", Ash clouds to several hundred meters above the crater. Occasional rumbling noises accompanying the emissions were heard intermittently throughout the month. A particularly large Vulcanian explosion on the afternoon of 31 October produced a dark column that rose to ~10 km. Langila volcano is one of the most active volcanoes in the Bismarck Arc of New Britain. Emissions from Crater 2 in October consisted of thin white vapour with occasional dark gray, ash-laden convoluting columns rising up to a few hundred meters above the crater. "Moderate eruptive activity continued at Langila during December. The aviator's observations follow. ~ ~ ~ ~ There were a few Vulcanian explosions from Crater 2 in the first half of the month, and virtually no activity during the second half of the month. "From 21-27 December, activity became much stronger, with continuous ejection of thick tephra-laden vapour to 1.8-2.7 km above the summit accompanied by continuous loud rumbling and explosion sounds. Periods of stronger visible activity were usually accompanied by large-amplitude volcanic earthquakes and periods of harmonic tremor. 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