One pyroclastic flow traveled 1,500 m down the Besuk Kembar river. The Alert Level remained at 2 (on a scale of 1-4), and the public was reminded to stay outside of the general 1-km radius from the summit and 4 km on the SSE flank.PVMBG reported that the eruption at Semeru continued during 27 May-2 June, though sometimes weather conditions prevented visual confirmation. On 27 March a pyroclastic flow traveled around 3,750 m toward Bang River. The plumes drifted W. Ash was not detected on satellite imagery.Based on satellite imagery and information from CVGHM, the Darwin VAAC reported diffuse ash plumes from Semeru at an altitude of 4.6 (15,000 ft) a.s.l. On 22 October another small ash signature originating from Semeru was observed on satellite imagery. van Bemmelen R W, 1937.
Cloudy conditions prohibited visual observations. The new pit was roughly 200 m deep. Based on a pilot report, the Darwin VAAC reported that an ash plume from Semeru reached 5.5 km (18,000 ft) a.s.l. High resolution satellite images have tracked changes on the active Semeru's summit. Semeru volcano eruptions: 1818, 1829, 1830, 1832, 1836, 1838, 1842, 1844, 1845, 1848, 1849 (? Most explosions sent only ash plumes above the highest point of the crater rampart. On 2 February a large explosion was reported and incandescent material was ejected 2.5 km from the crater. A moderate explosion at the central vent, observed from the NE crater rim, started with a booming sound followed by the noisy fallback of ballistic material into the crater. The lava dome continued to grow at about 100 m"Semeru has been continuously active during at least the past two years. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.There are no samples for Semeru in the Smithsonian's NMNH Ash plumes and thermal anomalies continue during September 2019-February 2020MIROVA (Middle InfraRed Observation of Volcanic Activity)Hawai'i Institute of Geophysics and Planetology (HIGP) - MODVOLC Thermal Alerts SystemEjection of ash and nuées ardentes; lava dome growthNuées ardentes and lava avalanches; one killed, 272 evacuatedFrequent explosions and lava extrusion throughout 1985Vulcanian activity continues; nuées ardentes de avalancheVulcanian explosions, lava avalanches, and nuées ardentesEnd to Vulcanian activity and dome growth; new collapse pit in craterMore frequent explosions and tremor; lava avalanchesFrequent explosions eject 1-km clouds; summit morphology describedLava avalanches and pyroclastic flows kill six peopleNormal mild explosive activity in August; slow lava extrusionHazard status raised; mid-July explosion earthquakes, pyroclastic flowsExplosions, pyroclastic flows, and lava avalanches continueIntermittent pilot reports of eruptions from August to OctoberA 2-km-long pyroclastic flow on 7 October; minor ashfallFrequent explosions and ash plumes; two climbers killedMass wasting in March; ash eruptions continue; 9-km-high ash cloud in MayAsh emissions and pyroclastic flows during June-SeptemberShort-lived Vulcanian explosions continuing from Jonggring Seloko CraterOngoing eruptive activity; 27 July explosion causes injuries and two fatalitiesSeismicity increases beginning in March 2002; Alert Level increased to 2Higher-than-normal seismic and explosive activity during June-September 2002Elevated explosive activity continues; evacuation on 30 December 2002Continued ash explosions, with frequent lava avalanches and pyroclastic flowsAsh plumes, pyroclastic flows, and high seismicity continue through JuneNovember volcanism includes 70-90 explosions per dayPersistent seismicity and ash plumes during April-June 2004Many ash plumes and some pyroclastic flows during February 2007-March 2009Incandescent rock avalanches travel 750 m, plumes reach 500 m above craterIncreased seismicity with lava flows and pyroclastic flows during February-April 2012Activity diminishes 2009-2013, active lava dome growth 2014-2016Renewed thermal anomalies from mid-May through December 2017Small ash plumes in February, April, July, and August 2018; persistent thermal hotspot in the craterIntermittent activity continues during March-August 2019; ash plumes and thermal anomaliesAsh plumes and thermal anomalies continue during September 2019-February 2020Ejection of ash and nuées ardentes; lava dome growthNuées ardentes and lava avalanches; one killed, 272 evacuatedFrequent explosions and lava extrusion throughout 1985Vulcanian activity continues; nuées ardentes de avalancheVulcanian explosions, lava avalanches, and nuées ardentesEnd to Vulcanian activity and dome growth; new collapse pit in craterMore frequent explosions and tremor; lava avalanchesFrequent explosions eject 1-km clouds; summit morphology describedLava avalanches and pyroclastic flows kill six peopleNormal mild explosive activity in August; slow lava extrusionHazard status raised; mid-July explosion earthquakes, pyroclastic flowsExplosions, pyroclastic flows, and lava avalanches continueIntermittent pilot reports of eruptions from August to OctoberA 2-km-long pyroclastic flow on 7 October; minor ashfallFrequent explosions and ash plumes; two climbers killedMass wasting in March; ash eruptions continue; 9-km-high ash cloud in MayAsh emissions and pyroclastic flows during June-SeptemberShort-lived Vulcanian explosions continuing from Jonggring Seloko CraterOngoing eruptive activity; 27 July explosion causes injuries and two fatalitiesSeismicity increases beginning in March 2002; Alert Level increased to 2Higher-than-normal seismic and explosive activity during June-September 2002Elevated explosive activity continues; evacuation on 30 December 2002Continued ash explosions, with frequent lava avalanches and pyroclastic flowsAsh plumes, pyroclastic flows, and high seismicity continue through JuneNovember volcanism includes 70-90 explosions per dayPersistent seismicity and ash plumes during April-June 2004Hawai'i Institute of Geophysics and Planetology (HIGP) Thermal Alerts SystemMany ash plumes and some pyroclastic flows during February 2007-March 2009Center of Volcanology and Geological Hazard Mitigation (CVGHM)Incandescent rock avalanches travel 750 m, plumes reach 500 m above craterCenter of Volcanology and Geological Hazard Mitigation (CVGHM)Hawai'i Institute of Geophysics and Planetology (HIGP)Increased seismicity with lava flows and pyroclastic flows during February-April 2012Center of Volcanology and Geological Hazard Mitigation (CVGHM)Activity diminishes 2009-2013, active lava dome growth 2014-2016Hawai'i Institute of Geophysics and Planetology (HIGP)MIROVA (Middle InfraRed Observation of Volcanic Activity)Renewed thermal anomalies from mid-May through December 2017MIROVA (Middle InfraRed Observation of Volcanic Activity)Hawai'i Institute of Geophysics and Planetology (HIGP) - MODVOLC Thermal Alerts SystemSmall ash plumes in February, April, July, and August 2018; persistent thermal hotspot in the craterMIROVA (Middle InfraRed Observation of Volcanic Activity)Hawai'i Institute of Geophysics and Planetology (HIGP) - MODVOLC Thermal Alerts SystemMIROVA (Middle InfraRed Observation of Volcanic Activity)Hawai'i Institute of Geophysics and Planetology (HIGP) - MODVOLC Thermal Alerts SystemIntermittent activity continues during March-August 2019; ash plumes and thermal anomaliesMIROVA (Middle InfraRed Observation of Volcanic Activity)Hawai'i Institute of Geophysics and Planetology (HIGP) - MODVOLC Thermal Alerts SystemAsh plumes and thermal anomalies continue during September 2019-February 2020MIROVA (Middle InfraRed Observation of Volcanic Activity)Hawai'i Institute of Geophysics and Planetology (HIGP) - MODVOLC Thermal Alerts System
No ash was visible on satellite imagery.An ash cloud from Semeru was visible on satellite imagery on 21 July at 2316 extending ~75 km to the WSW.During 2-29 June, activity continued at high levels at Semeru. The frequency and power of these thermal anomalies significantly increased during September to mid-December 2019 with a few hotspots occurring at distances greater than 5 km from the summit. During January 2012, crater incandescence was observed, and avalanches carried incandescent material 200-400 m away from the crater. and drifted S. On 24 November, CVGHM reported an eruption plume to an altitude of 4.4 km (14,000 ft) a.s.l. was observed on satellite imagery. Minor explosions that rose 300 m above the volcano were observed during clear weather. and drifted WNW based on satellite images and weather models. since 1967. and drifted NE.
VSI characterizes Level II as "increasing seismic activity and other volcanic events and visual changes around the crater" but also states that this definition implies "no eruption is imminent." The plumes drifted SW.Based on a news report, eruption plumes from Semeru drifted E on 10 and 11 February. Vulcanian activity continued through August. Explosion earthquakes were variable (31-136 events/day), with two minima on 5 and 25 December (24 and 19 events/day, respectively) (figure 9).Typical activity for this volcano was observed by Steve O'Meara on 13 November from the rim of Tengger Caldera. Explosions and lava avalanches occurred frequently during the first week of July, although thick haze often precluded visual observation.
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