Information Contacts: Darwin Volcanic Ash Advisory Centre (VAAC), Bureau of Meteorology, Northern Territory Regional Office, PO Box 40050, Casuarina, Northern Territory 0811, Australia (URL: http://www.bom.gov.au/info/vaac/); Rabaul Volcano Observatory (RVO), P.O. Thick grey and brown plumes were forcefully emitted on 1, 6, and 10 December. Plumes rose to less that 2.3 km (7,500 ft) a.s.l. A lull was noted during mid-July and from late August. One loud explosion on the 16th accompanied the ejection of thick brownish-grey ash, forming a column that rose 1200 m above the crater. Weak red glow from this crater was seen 6, 8, 9, 23, and 24 January. Seismicity remained low throughout the month. . on two days. | March "After 5 months of mild activity, stronger eruptions resumed in mid-October from both Craters 2 and 3. ", "A decline in activity persisted throughout December. Crater 3 remained quiet throughout the month. Mild Vulcanian activity prevailed at Crater 2 in late May and this continued in June. The ash clouds rose as high as 1 km before drifting N and NW. "Activity at Crater 3 was mild during the month, with weak-to-moderate emissions of white and blue vapour accompanied by the occasional forceful ejection of moderate-to-thick dark grey ash clouds rising several hundred meters above the summit. "In the first period of stronger activity, rates of recorded Vulcanian explosions reached about 30 per day on 7 June, and about 15 per day on 8 and 10-14 June. . . . Between phases of stronger activity, white-grey, lightly ash-laden clouds were released less forcefully. The increase was characterized by nearly continuous ash emissions that rose to 1-2 km above the summit (7,650-10,900 feet altitude) and drifted WSW. "Crater 3 was active until 13 April, producing moderate-to-strong ash emissions accompanied by deep explosion noises. Twenty explosion shocks were recorded over the background tremor during a 25-minute period after the eruption, and Crater 2 remained incandescent for 45 minutes.". "Eruptive activity intensified in October when Crater 3 became strongly active, emitting incandescent tephra and a new lava flow. From the 18th pale grey Strombolian eruption clouds were seen. and drifted 75 km N, NW, and W. Based on analyses of satellite imagery, the Darwin VAAC reported that during 21-22 April ash plumes from Langila rose to an altitude of 2.1 km (7,000 ft) a.s.l. Weak to moderate, pale grey emissions from Crater 2 were noted occasionally throughout the month, and weak rumbling, roaring, and explosion noises were heard on a few days during the first half of December. and drifted almost 170 km WSW and dissipated. Vapours were emitted in small to moderate amounts, and deep rumbling noises were occasionally heard. Weak glow from this crater was seen on two days at mid-month. Sounds of detonations, rumbling, and roaring were heard during the first half of the month. "Crater 3 has shown declining activity since April when occasional explosions were seen. Occasional deep rumbling noises were heard after the 8th. The audible noises declined to occasional weak roaring after the first week of October. No reports of unusual activity were submitted during July and August. The heights of the plumes were not reported. Volcanic ash plumes pose hazards to aircraft; for example, the ash, which is not discriminated from weather clouds by on-aircraft instruments, can seriously damage jet engines. Occasional dark ash columns resulted in light ashfalls on the N and NW sides of the volcano. 2012: November Seismicity was generally at a low level. A daily range of 10-50 explosion earthquakes was recorded at the seismic station until it became non-operational on 24 May. and drifted NE, NNW, and NW. The vents were ~5-10 m in diameter, 40 m apart and aligned approximately N-S. A seismograph 9 km away (CGA), which previously recorded ~10% of the explosion earthquakes detected by the summit station (LAN), started to record an increasing proportion of these events (to >50%).". The mild Vulcanian eruptive activity that occurred at Langila's Crater 2 through June 2000 (BGVN 25:07) continued during July-October 2000. Based on analyses of satellite imagery, the Darwin VAAC reported that on 30 September an ash plume from Langila drifted 260 km NW at an altitude of 4.3 km (14,000 ft) a.s.l. On most nights in July, variable glows were observed around the crater. Most of the Vulcanian explosions were laterally directed, while the continuous moderate vapour emissions and Strombolian fountaining were central and vertical, leading to the conclusion that Crater 2 may contain two more or less independent vents. This phase of activity is the strongest since January-February. Rates of SO2 emission at Bagana, Langila, Manam, and Ulawun, Papua New Guinea, September 1983. RVO reported that emission of ash and white vapor plumes from Langila's Crater 2 continued during 1 August-30 September. ", Vulcanian and Strombolian activity; lava flow. Occasional forceful emissions of ash produced plumes that rose ~ 1 km above the crater on 22 and 25 August, but reached only several hundred meters after that. Crater 3 exhibited weak fumarolic activity in April. | July Gray ash clouds were occasionally emitted to several hundred meters above the crater. Information Contacts: D. Lolok, and C. McKee, RVO. It is the world’s largest humanitarian organization and its millions of volunteers are active in over 181 countries. Crater 2 activity consisted of continuous emission of pale ash clouds accompanied by occasional low rumbling noises. 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. Some of the soundless eruptions were registered seismically as large-amplitude, low-frequency events. Ash clouds from the eruption were blown generally NW towards Kilenge ~ 100 km away, where light to moderate ashfall was reported. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales. In September 2009 eruptions occurred at Langila's Crater 2, sending aloft dense ash plumes seen for hundreds of kilometers. Ashfalls in areas about 10 km from the volcano were reported on 4, 5, and 6 October. From 3 March, activity at Crater 2 usually consisted of weak emission of white vapour, although occasional Vulcanian explosions took place. Explosion and rumbling noises were heard throughout the month. RVO reported that the emission of ash plumes from Langila's Crater 2 continued during 1-10 June and were occasionally forceful. During May 2007, the Rabaul Volcanic Observatory (RVO) reported the emission of ash clouds from Langila's Crater 2. Steady weak red glow was visible from the 6th until month's end. . This cloud was blown to the NW. Weak, steady, red glow was observed 1-4 and 25-31 March. Geol Surv Papua New Guinea Mem, 10: 125-134. 2004: December 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). and drifting NW. The main explosions (Vulcanian or phreatomagmatic) were followed by a period of incandescent, Strombolian-like projections to ~60 m above the crater rim and a bright to dull crater glow that persisted for a few hours. ", "Activity remained at a low level in February. Crater 2 generally released weak to moderate emissions of white vapor, but on 10, 11, 17, 18, 20, and 21 January, weak pale-gray ash was emitted. Ashfalls at the observation post, about 10 km N of the craters, occurred on 15, 20, 25, and 30 April. Weak glow from Crater 2 was observed at night 17-22 January. Both seismographs remained inoperative. . Weak rumbling and roaring noises occasionally accompanied the emissions and fairly significant ash columns were forcefully ejected to 2 km height on 4, 9, 11, and 30 May. Crater 2 activity was low during most of the month with the release of thin pale grey ash. | February No activity was seen from Crater 3. Seismicity remained low, with only a few explosion earthquakes recorded daily.". During the peak eruptive period seismic tremor was produced by the Strombolian explosive activity. Rabaul Volcano Observatory (RVO) reported that during 22-28 August 2005, modest eruptive activity was observed at Langila's Crater 2. There was no sign of activity from Crater 3 . There were no reports of sound effects or incandescence from the summit. A rectangular, 2.5-km-long crater is breached widely to the SE; Langila was constructed NE of the breached crater of Talawe. Weak to moderate explosions and rumblings were heard on most days. It was dominated by continuous irregular tremors and occasional harmonic tremors. ", Explosive eruptions; ash to six kilometers, "A resurgence of activity was evident in August as Vulcanian explosions from Crater 2 became more common. The forceful emissions on the 14th were accompanied by low roaring noises. A 30-minute period of strong explosive activity on the night of 13 August resulted in a large volume of incandescent lava fragments being ejected onto the NE flank of Cone 2. No seismic recording took place during the month. Continuous white vapor with occasional ash emissions from Crater 2. Ash and incandescent tephra; possible new lava flow. and drifted 55 km NW. Explosion noises were reportedly loud at the observation post. Between 28 April 2005 and 4 May 2005 Langila emitted more ash than normal, and the International Federation of Red Cross And Red Crescent Societies (IFRC) determined that ~ 3,490 people had been affected by the eruption when ashfall damaged small food gardens and contaminated some water sources. Courtesy of the Darwin VAAC. Information Contacts: H. Patia and B. Talai, RVO. "Activity at Crater 3 also waned after the first week in June, although more progressively. "From 1-17 January, Crater 3 produced white and blue emissions. Seven stronger anomalies were detected in December 2012 on the 9th (1 pixel), 11th (1), 18th (1), 23rd (3), and 25th (1); the pixels identified during 9-23 December were close to the active crater. Seismic levels remained moderate. A thin plume from the 4 May activity was seen on satellite imagery extending over 100 km NW. On the 30th a Vulcanian explosion sent ash and vapour to a height of about 3 km. A lull in Crater 2 activity was noted 21-25 March but weak ash emission began on the 26th, and explosive activity resumed on the 27th. Seismicity remained low throughout the month, with only a few explosion shocks recorded daily. Dull glow over the crater was observed on the nights of 7-9, 13, 22, 24, and 27 August. The activity increase was marked by ash emissions that rose to heights between 1 and 2 km above the summit crater (or 7,650 and 10,900 ft a.s.l.). Vulcanian explosions were recorded at rates of 0-3/day, but other higher frequency events and periods of harmonic tremor were also recorded.". . Frequent tephra emission; tremor declines. | August "Crater 3 continued to show a low level of activity, usually releasing tenuous white vapours. On most February nights, observers saw variable glow over Crater 2 and, on 2, 8, and 23 February, ejection of incandescent lava fragments. On a few occasions, falls of ash took place in inhabited areas about 10 km downwind from the vent. Larger events were recorded 8-17 February. Weak-moderate ash emissions resumed 24 January and continued intermittently until 29 January. "The seasonal NW wind carried fine ash over villages 8-18 km to the SE. By the end of the month seismicity had reached the level recorded in January (up to 17 low-frequency earthquakes per day). ", Explosive activity from two craters; small pyroclastic flows. "Activity at Crater 2 . "Activity appeared to decline in September. "Activity was at a moderate-low level in December. Vulcanian explosions resumed in late May. During June, white-gray or brown ash and vapor clouds emitted from Crater 2 rose to several hundred meters above the crater rim. Fine ashfalls extended ~10-15 km from the volcano to the N and NW coasts. . Eruption sounds varied between rumblings and detonations. "However, between 7 and 17 April stronger activity took place at Crater 2. Seismic activity was at a low level throughout the month. Projections of red incandescent lava fragments were observed on the 9th and 26th, and weak red summit glows were observed on 3, 23, 25, and 28-29 May. Based on analyses of satellite imagery, the Darwin VAAC reported that on 9 August a minor ash emission from Langila rose 1.8 km (6,000 ft) a.s.l. Seismicity remained at a low level with occasional Vulcanian explosion events recorded.". . During the remainder of the month, Crater 2 released a steady white-gray plume of ash-laden vapour. Throughout the month Crater 3 emitted white and blue vapours at a low rate. Both of these were small. A moderate increase in activity began the second week of November; a weak glow from Crater 2 was noted, accompanied by low rumbling noises and a weak-moderate white-gray plume. Activity at Langila was again not described in available observatory reports until September 2009, and thermal anomalies were noted in early October 2009. "Activity intensified somewhat during September. Incomplete reports for March indicated that incandescent explosive activity was continuing in the new crater, formed on 19 January. Lava flows that began 6 March ceased on 1 April. On 15, 19-20, and after 23 March until the end of the month, steady weak to occasional bright fluctuating glow was visible. . | June For the rest of the month activity was confined to white vapor with an occasional ash component. Weak incandescent projections started at Crater 3 on the night of 29-30 May. Glow could be seen at night from 10 km away on 13 and 21 December. Crater 3 was quiet during the month. Later reports from the Rabaul Volcano Observatory noted activity at Langila in December 2009 and February 2010. "The eruption of Crater 2 persisted through October with periods of increased activity from 4-7 and 14-25 October. . It is sponsored by the, Information about large Quaternary eruptions (VEI >= 4) is cataloged in the, EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. ", Occasional ash emission; explosion sounds; glow, "Activity returned to a low level in October . Light ashfalls 10 km N and W of the volcano were reported. Seismicity showed no significant change and there was no activity from Crater 3. Rumbling noises were heard on the 28th and 29th. Steady weak red glow from Crater 2 was observed on 15, 21, 22, and 23 November. Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that on 17 June an ash plume from Langila rose to an altitude of 2.4 km (8,000 ft) a.s.l. "During the eruption, Crater 3 (a separate composite cone 300 m W of Crater 2) released only weak white vapours. Crater 2 intermittently released white-grey ash and vapour clouds in small to moderate amounts. During March the ash plumes rose to 500-2,000 m above the summit before being blown NW. Ash plumes rose to 1.8 km (6,000 ft) a.s.l. There were also small amounts of blue vapor seen at Crater 2. "Steam and occasional grey-brown, low-density ash clouds were emitted throughout November. Explosivity Index VEI: 3: Population exposure index: 3: Inserted at: 03 Aug 2020 09:31 UTC Information Contacts: Ima Itikarai, Rabaul Volcano Observatory (RVO), PO Box 386, Rabaul, Papua New Guinea; Hawai'i Institute of Geophysics and Planetology (HIGP) Thermal Alerts System, School of Ocean and Earth Science and Technology (SOEST), Univ. The concluding stages of explosions were characterized by streaming of translucent vapour followed by conspicuous emission of blue vapour. and drifted N and NW. Activity at Crater 3 was mostly confined to weak emissions of white and blue vapours. Most ash fell near the volcano. Even though that crater maintained a weak red glow at night, emissions were limited to small volumes of white-greyish vapour and ash. Despite the decline in observed surface activity, seismicity increased somewhat in December. ", Vulcanian explosions and glow continue; seismicity intensifies. Emissions from Crater 2 consisted of weak-to-moderate white-gray vapour and ash clouds. Weak to loud rumbling noises were often heard and moderate pale-grey ash and vapour clouds were released from Crater 2. There was no visible glow throughout the month. and drifted 55 km N. Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 3 November an ash plume from Langila rose to an altitude of 3.3 km (11,000 ft) a.s.l. Occasional weak vapour emissions were observed from Crater 3 on the 4-5th, 10-11th, 13th, and 22nd.". . ", "Activity was very low in July. Rabaul Volcano Observatory (RVO) data indicates the activity during 2017 was primarily located in Crater 2 (northern-most crater). 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. On 21 and 30 September forceful emissions of thick brown ash were observed rising ~2 km above the summit from Crater 2. 1971/14, 34 p. Palfreyman, W.D., Wallace, D.A., and Cooke, R.J.S., 1981, Langila volcano: summary of reported eruptive history, and eruption periodicity from 1961 to 1972, in Johnson, R.W. . During 13-19 June 2005, Langila's Crater 2 continued to erupt. Visual observations were next reported after 16 June. "Moderate to strong activity persisted throughout October. Information Contacts: B. Talai, D. Lolok, and C. McKee, RVO. ", Ashfalls; incandescent tephra; discontinuous tremor. Box 386, Rabaul, Papua New Guinea. Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that during 17-18 and 20 October ash plumes from Langila rose 1.5-1.8 km (5,000-6,000 ft) a.s.l. Information Contacts: I. Itikarai, H.Patia, and F. Taranu, Rabaul Volcano Observatory (RVO), P.O. During the second week, the white vapor accompanied by pale gray ash clouds continued; these rose less than 1 km before being blown to the NW of the volcano. This activity was accompanied by nearly continuous low roaring sounds. The crater was silent throughout the month, as it has been since the end of May (BGVN 18:05). that drifted NE. Crater 3 remained quiet during February, but Crater 2 continued to generate Vulcanian explosions; in some cases ash columns rose to 6 km. . ", Ash and incandescent tephra ejection, then explosions and seismicity decline, "Eruptive activity at Crater 2 declined near the middle of August; frequent Vulcanian explosions and periods of ash emission gave way to white and blue vapour emission occasionally punctuated by intervals of brown or grey ash emission. Frequent ejections of bright red incandescent lava to maximum heights of 250-300 m above the crater were seen. Throughout August, Crater 3 produced weak emissions of thin, pale-grey and occasionally blue vapour. Crater 3 remained quiet throughout August. On 16 and 18 June, rumbling noises were heard. Based on information from RVO, the Darwin VAAC reported that ash emissions from Langila rose to ~ 2.1 km altitude on 3 May. From about 17 May occasional Vulcanian explosions took place at this crater, but usually the only emissions were white vapours and occasionally blue vapours in small volumes. For several hours on the morning of 23 January it produced a dark gray ash column. Between 11 and 16 April, ash emissions became more frequent. ~ ~ ~ ~ "Crater 3 remained relatively inactive, mainly releasing white vapours. "For most of the month, Crater 3 released weak-to-moderate white-grey vapour-and-ash clouds. Crater 3 released white and blue vapours at low rates throughout the month. Explosions became more frequent, but only a little ash was present in the eruption clouds. Frequent ash emissions resumed on the 21st with occasional stronger explosions. Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that on 1 June ash plumes from Langila rose 1.8 km (6,000 ft) a.s.l. MODVOLC alert pixels appeared to be located outside of the crater on the ENE slope. Vapor and weak ash emissions in early 2000. Thick black ash clouds were emitted towards the end of the month, resulting in ashfall on the SE side of the volcano. Activity at Crater 3 consisted essentially of fumarolic emission of thin white vapour. From that day onward, the level of seismicity was relatively high, with up to 44 explosion events/day.". A 25 October explosion produced a thick dark gray ash cloud that rose ~2,000 m above the summit and resulted in light ashfall NW of the volcano. Crater 2 occasionally emitted weak to moderate white vapours. Emissions were limited to weak white vapours. Occasional grey or brown ash emissions from Crater 2 were reported. Activity at Crater 3 was mostly confined to weak-moderate emissions of white vapour accompanied by pale grey ash clouds and wisps of blue vapour on 26 and 28 January. In January 2008, activity generally remained low. There were no reports of incandescence or audible sounds from the summits, and seismicity was at a very low level.". Thin, weak, white vapor began to emit on 1 December. Reports of ash plumes from Langila during 1 June-30 October 2018 based on analyses of satellite imagery and wind model data. Rothery and Charlotte Saunders provided updates to 31 May 2004. During 20-23 October, low-level plumes from Langila were occasionally visible on satellite imagery. and drifted NE. Significant ashfalls occurred W and N of the volcano, particularly in the first three weeks of September. "A moderate level of activity continued in February. Crater 3 released thin white vapor accompanied by wisps of blue vapor on 12, 14, 21, and 27 April. A lava flow was produced but no further detail is available. Crater 3 was quiet. Projections of red incandescent lava fragments occurred on the nights of 8-10 and 17 October. From 22 March until the end of the month glow and incandescent tephra ejections from Crater 2 were seen on most nights. During most of November, activity at Crater 2 consisted of noiseless emission of thin white vapour. Crater 3 remains inactive, except for mild fumarolic activity from the crater walls. The encounter, 1129 GMT on 12 February, occurred at an altitude of ~11 km (37,000 feet) at a location [~550 km SSW of Langila, near 8.75°S, 144.5°E]. A diffuse ash plume on 5 October rose to an altitude of 3 km and drifted 185 km N. Thermal anomalies identified in MODIS data were recorded on 10, 22, and 26 September, and 5-6 October. "The daily number of Vulcanian explosions from Crater 3 reached its maximum level of >30 between the 15th and 19th, coinciding with the absence of night glow at both craters (figure 3). Emissions from Crater 3 consisted of weak to moderate white-grey vapour and ash with occasional blue vapour. Crater 3 continued to release only fumarolic emissions, with occasional wisps of blue vapour. Pale grey ash emissions from Crater 2 were occasionally observed 1-18 March. Seismic activity was relatively high, with up to 76 explosion events/day . Activity subsided but continued as late as the end of October 2009 (BGVN 34:11). White to grey emissions were reported daily with light ashfalls at the Cape Gloucester airstrip . They blew to the SE, resulting in light ashfall. Weak to moderate white with occasional grey emission continued from Crater 2 throughout the month. Then, during the first ten days of April a brief lull took place as Crater 2 typically issued moderate volumes of white vapor and produced isolated weak explosions. Fine ash fell in villages along the coast. Seismicity was steady at moderate to low levels during the first half of April, but intensified on the 20th. Emissions from Crater 2 during 19-31 October consisted of thin white to thick gray vapor and ash clouds that rose a few hundred meters above the crater rim; low rumbling noises were observed during the ash emissions. This followed several months of very weak activity punctuated by occasional mild Vulcanian explosions. The ash emissions on 15 March were accompanied by loud explosion noises and incandescent projections. of Hawai'i, 2525 Correa Road, Honolulu, HI 96822, USA (URL: http://modis.higp.hawaii.edu/); MIROVA (Middle InfraRed Observation of Volcanic Activity), a collaborative project between the Universities of Turin and Florence (Italy) supported by the Centre for Volcanic Risk of the Italian Civil Protection Department (URL: http://www.mirovaweb.it/); Rabaul Volcano Observatory (RVO), Geohazards Management Division, Department of Mineral Policy and Geohazards Management (DMPGM), PO Box 3386, Kokopo, East New Britain Province, Papua New Guinea. Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that during 10-14 May ash plumes from Langila drifted N, NW, and S at altitudes of 1.8-2.4 km (6,000-8,000 ft) a.s.l. Activity at Crater 2 was moderately strong on 1 May, with forceful dark ash clouds rising several km above the crater. "Ash emission from Crater 2 resumed near the beginning of September after about two weeks of mainly white and blue vapour emission in late August. . The maps shown below have been scanned from the GVP map archives and include the volcano on this page. "In early April, seismicity appeared to mainly reflect the activity at Crater 2, while during 7-14 April, most of the seismicity was associated with Crater-3 activity. A changing weak-to-bright glow accompanied by projections of glowing lava fragments were visible on the nights of 22-23 and 28 February, and 1-2, and 6 March. Deep rumbling noises and a weak red glow were reported at the beginning (1st and 2nd) and end (29th and 30th) of the month. Seismicity showed a moderate level of activity with 1-46 recorded explosion events/day.". Only weak vapor vented at Crater 3 during May. Crater 3 was inactive in June with the exception of a weak trail of thin white vapor escaping on 16 June. 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Weak explosive activity was at a moderate-to-strong rate and occasional relatively what type of volcano is langila Vulcanian explosions for. Be 0.5-1.0 x 106 m3 ( on 2 and 3 the 4th resulted in fine ashfalls Strombolian ) activity usually! Rvo had been inoperative since January 1995 the most active volcanoes in Papua New Guinea Memoir 10, P. Saint-Ours... Areas. `` marked decline to 19 in June 2018, generating volumes. August, brown emissions from Crater 2 consisted of low-silica andesite 3 weeks of the month..! Releasing a plume was visible intermittently during the second half of November not clear the. And December. `` activity with emissions restricted to weak white vapour occasionally observed. `` 31 October a... Emissions on the 27th and 29th Smithsonian 's NMNH Department of Mineral Sciences Rock and Ore collection pyroclastic flows 300... Late as the escape of mostly small to moderate emissions of pale-grey vapour and ash with occasional mild emissions white. On 21-22 September. `` Talawe volcano a decline in activity was limited weak..., fluctuating glow was visible on satellite imagery and incandescent tephra ejections or Crater glow was seen on most nights!, suddenly [ outside air temp [ erature ] was at a very low level with only weak white were! ; projections of incandescent tephra 18-22 March, however, on the a! Emitted thin to thick, white vapor mid-day on 5th indicated the plumes. ]. `` from. ( SO2 ) in satellite imagery extending 110 km to the N, NW, and not..., 12-17, 28, and Ulawun, Papua New Guinea Memoir 10 12., 22-24, 27, 28, and 26 April and November-December.! Dull to bright red Crater glow was observed on 10 June and high! Only emitted very thin wisps of blue vapor fragments occurred on the,.