"There are some indications that the eruption was phreatomagmatic. Overall there are 46 volcanoes with continuing eruptions as of the Stop Dates indicated, and as reported through the last data update (10 December 2020), sorted with the most recently started eruption at the top. On 6 October 1994 the stratovolcano was visited by Chris McKee and Rod Stewart (RVO), and Stan Williams and Steve Schaefer (ASU), because of reports that the gas plume was abnormally large. Seismic activity was low throughout the month. DMSP Imagery, etc.) Activity during October. Seismicity remained at background level, with only a few events/day of very small amplitude and occasional larger B-type shocks.". Ulawun Location:on the island of New Britain, Papua New Guinea Elevation: 2,334 m Type of volcano: stratovolcano Activity: one of the most active volcanoes in Papua New Guinea. At the peak of seismicity (about 20 times normal levels, on 8 January), weak ejections of incandescent tephra occurred at a rate of 1-2/minute from one or two vents in a mound of fresh lava in the summit crater. continued to decline following the brief phreatic or phreatomagmatic activity in mid-January (BGVN 18:01). The low-level activity of previous months persisted through April and May. On 28 April at 2215 the anomaly had increased to 15 alert-pixels with a higher maximum alert ratio of -0.053. Information Contacts: C. McKee and I. Itikarai, RVO. People on the S and SE sides of the island heard "low jetting" noises during 24-25 May 2010. This sequence can be related to events reported by the Rabaul Volcano Observatory (BGVN 26:06) On 26 April 2001 at 0530 a small Strombolian eruption began. Information Contacts: I. Itikarai, P. de Saint-Ours, R. Stewart, and C. McKee, RVO. The initial 22 August report noted "thin plume to FL 100 [~ 3 km altitude] extends 60 NM [~ 110 km] to SW on NOAA 15 [image of 2038 UTC on 22 August] . When visible, weak-moderate white vapour emissions were observed. Ash fell on the NW flanks, in Ubili and Ulamona. Lava flowed throughout the eruption. On the 30th, an Ms 5 regional earthquake, 75 km away, triggered continuous tremor lasting the following 2 1/2 days. and drifting W. Ash was not confirmed in satellite images, though weather clouds obscured views. No additional activity was reported by the Rabaul Volcano Observatory (RVO) until a seismic swarm preceded observations of glow on 13-14 June 2008. Seismic activity had been low through January-February, but an increase was evident starting on 2 March. During the cover of darkness, ash clouds were just visible, initially illuminated by the glow and gradually by incandescent fragments. On 18 and 19 June, seismicity increased to a high level and was dominated by volcanic tremor. At about 0720 they were reportedly much larger and descended all flanks of the volcano, particularly the N and SW flanks. "A number of seismic crises took place in June in which periods of volcanic tremor were recorded. "For most of the month, the volcano-seismicity consisted of occasional, small, low-frequency events. "The first period of harmonic tremor, which was low in amplitude, lasted less than 2 hours. In addition, periods of sub-continuous, non-harmonic tremor started on the 11th, becoming continuous for periods of 1-2 hours daily after the 14th. The second explosion was smaller but also produced a dark ash column. There were also unconfirmed reports of glow at other times during February. A strong correlation between activity and preceding heavy rainfall (as observed in March) was not evident. Box 386, Rabaul, Papua New Guinea; Darwin Volcanic Ash Advisory Center (VAAC), Bureau of Meteorology, Northern Territory Regional Office, PO Box 40050, Casuarina, NT 0811, Australia (URL: http://www.bom.gov.au/info/vaac/); Diego Coppola and David A. Rothery, Department of Earth Sciences, The Open University, Milton Keynes, MK7 6AA, United Kingdom. Geological Survey of Papua New Guinea. On 24 April at 1400 the tremors increased again, making it hard to detect patterns in the analog records. Five days of strong seismicity; mild explosive activity. RVO reported that between 23 and 31 October the main summit crater continued to produce variable amounts of white gas-and-steam emissions (figure 24) and that no incandescence was observed after 5 October. This 2002 eruption started with a few signs in December 2000 where there were a few earthquakes/ volcanic tremors in the region that were prolonged. Electronic tiltmeter trends showed inflation beginning in early August 2000. Plume extends 80 NM W of volcano, height to 4 km. "An aerial and field inspection was carried out on 6 and 7 June. Ash observed on satellite imagery. Based on satellite imagery, the Darwin VAAC reported that ash-and-steam plumes from Ulawun drifted SW and S on 30 August and 2 September, respectively. Some areas of the plumes were gray on 22 and 25 May. Cooke R J S, Baldwin J T, Sprod T J, 1976. Summit activity was dominated by weak to moderate volumes of white vapor, and seismicity was generally low. Ulawun is a stratovolcano. Box 386, Rabaul, Papua New Guinea. . Possible narrow low level plume evident on 30/0010Z MODIS and 30/0230Z GMS visible image[s], extending 30 NM WNW, height estimated below 3 km. During 26 November 2010, based on analyses of satellite imagery and information from RVO, the Darwin VAAC reported that an ash plume rose to an altitude of 3.7 km and drifted 55 km NE. Highlights of behavior, August 2010 through February 2011. The 2002 Eruption – Nyiragongo last eruption The 2002 Eruption – Nyiragongo last eruption. Information Contacts: Ima Itikarai and Herman Patia, Rabaul Volcano Observatory (RVO), P. O. 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. Table 3. Eruption on 30 April 2001 sends an ash cloud to a height of ~13.7 km. "Activity remained at a very low level, with the summit crater releasing white vapour in small to moderate amounts. Weak-to-moderate vapor plumes were emitted from the summit vent, and on the 21st weak roaring noises were heard and a weak red glow was briefly visible. By 1000 the volcano was totally obscured down to its base, and at Ulamona the darkness was total for several hours. Since its last major explosive eruption (at about 1645 BC) numerous minor and medium-sized, mainly effusive eruptions have occurred. on 4 October 1973. Information Contacts: Ima Itikarai, Rabaul Volcanological Observatory, P.O. . General References. The seismicity showed a different response; it suddenly declined from medium intensity to virtually nothing on the 17th, after a period of strong tremor lasting ~10 minutes. Apparently the earthquake was not reported by the observer at Ulamona, NW of the volcano, suggesting it was local and focused on the S side of the volcano. The two N valley vents remained quiet. "RVO" stands for Rabaul Volcano Observatory. The first, on 10-11 June, lasted for about 15 hours and was followed by four more: 15 June (7 hours), 16 June (7 hours), 17-18 June (17 hours), and 30 June - 2 July (48 hours). "By 14 May, the lava flow sources were fewer in number and much weaker; sources higher up the fissure had stopped and only one fountain was still active, at the bottom end of the fissure. After the tremor peaked on the 27th at about 1000 it fluctuated as it generally declined. White vapor emissions and low-level seismicity. RVO reported that activity during 1-2 March at Ulawun consisted of strong forcefully expelled "gray-blue emissions" from the main crater. Weak rumbling noises were heard between 2000 and 2300 on 15 June, but these may have been distant thunder. Seismicity was at a low level between 16 and 27 May, after which time none was recorded. "Apart from the addition of a veneer of deposits from the pyroclastic avalanches and airfall ash, the topographic changes to the volcano brought about by the eruption include the formation of a series of gouges on the upper NE flank and the reaming out of an enlarged summit crater. of Hawai'i, 2525 Correa Road, Honolulu, HI 96822, USA (URL: http://modis.higp.hawaii.edu/). Mount Ulawun volcano erupts with hot ash and lava sent flying into the sky; ... 62, looks the same as she did 30 years ago when she was in Last Of The Mohicans as … During the rest of August, the summit crater released thick white vapor. "After 0600, weak emissions of dark ash were seen from Ulamona. ASH CLOUD: Narrow ash cloud extends 40 NM to SW. Ash plume observed on satellite imagery 2130Z. The Provincial Disaster Office reported significant building damage near the epicenter and in the town of Kimbe (65 km NW of the mainshock's epicenter, figure 14). A lava flow which emerged during the night traveled 1-2 km NW, though visibility was hindered due to weather conditions. The mainshock's epicenter was also ~45 km S of Pago volcano and 134 km SW of Ulawun. This rapidly developed into explosions of incandescent lava fragments from the summit crater, which increased in intensity until by 2100-2200 a full-scale eruption was in progress. During 2-19 and 23-26 June, white to gray-brown plumes rose to ~3 km altitude (figure 15). Between 26 and 29 September RVO reported that the seismicity increased slightly and included low-level volcanic tremors and Real-Time Seismic Amplitude Measurement (RSAM) values in the 200-400 range on 19, 20, and 22 September. The late-stage buildup also appeared in RSAM readings. Isolated tremor episodes and slow deflation through March 2002. ", "Activity remained at a low level in October. Only white vapor was emitted from the main summit crater and there were no emissions from the north valley vent.