Weekly Volcanic Report

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Rich

SI / USGS Weekly Volcanic Activity Report

  • Tue, 19 Jan 2021 04:48:12 -0700: Semeru (Indonesia) - Report for 13 January-19 January 2021 - Smithsonian / USGS Weekly Volcanic Activity Report

    PVMBG reported that during 1-15 January incandescent avalanches of material from the Jonggring Seleko Crater at Semeru sometimes traveled 500-1,000 m down the Kobokan drainage on the SE flank. Incandescent material was ejected 10-30 m above the summit and white-and-gray plumes rose 200-300 m and drifted N. Weather conditions often prevented visual observations. A pyroclastic flow was detected at 1451 on 1 January, though weather clouds prevented visual confirmation. At 1724 on 16 January incandescent avalanches traveled as far as 1 km down the Kobokan drainage and a pyroclastic flow traveled about 4-4.5 km down the same drainage. A large ash cloud rose along the length of the pyroclastic flow to 2 km above the summit and drifted NE and N. Ashfall was reported in areas to the N. During 18-19 January dense gray-white plumes rose 300-500 m above the summit and drifted N. Rumbling was heard and incandescent material was ejected 30 m high. The Alert Level remained at 2 (on a scale of 1-4), with a general exclusion zone of 1 km and extensions to 4 km in the SSE sector.

    Sources: Badan Nacional Penanggulangan Bencana (BNPB) ,Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM),The Jakarta Post

  • Tue, 19 Jan 2021 04:48:12 -0700: Aira (Japan) - Report for 13 January-19 January 2021 - Smithsonian / USGS Weekly Volcanic Activity Report

    JMA reported that during 11-18 January incandescence from Minamidake Crater (at Aira Caldera?s Sakurajima volcano) was often visible nightly. The sulfur dioxide emission rate remained high, reaching 2,100 tons per day on 13 January. Five explosions and three eruptive events were recorded, producing eruption plumes that rose 1.3-2 km above the crater rim and ejecting bombs 500-900 m away from the crater. The Alert Level remained at 3 (on a 5-level scale).

    Source: Japan Meteorological Agency (JMA)

  • Tue, 19 Jan 2021 04:48:12 -0700: Ruapehu (New Zealand) - Report for 13 January-19 January 2021 - Smithsonian / USGS Weekly Volcanic Activity Report

    GeoNet reported that volcanic tremor at Ruapehu declined to low levels on 29 December 2020, and remained low; volcanic gas emissions returned to background levels by the next day. Water chemistry had only slightly changed compared to data collected a few weeks prior. Although the temperature of the crater lake water remained high (40 degrees Celsius), the period of heightened unrest was over; the Volcanic Alert Level was lowered to 1 and the Aviation Color Code was lowered to Green on 11 January.

    Source: GeoNet

  • Tue, 19 Jan 2021 04:48:12 -0700: Veniaminof (United States) - Report for 13 January-19 January 2021 - Smithsonian / USGS Weekly Volcanic Activity Report

    AVO reported that seismic data for Veniaminof had not been received since 8 December 2020 due to a problem with the satellite link at Port Heiden. Both the Aviation Color Code and the Volcano Alert Level were changed to Unassigned on 15 January, reflecting the lack of available seismic data to detect unrest.

    Source: US Geological Survey Alaska Volcano Observatory (AVO)

  • Tue, 19 Jan 2021 04:48:12 -0700: Kilauea (United States) - Report for 13 January-19 January 2021 - NEW - Smithsonian / USGS Weekly Volcanic Activity Report

    HVO reported that low lava fountains from a vent on a cone on the inner NW wall of Kilauea?s Halema`uma`u Crater fed flows that traveled down a channel into a perched lava lake during 13-19 January. The western half of the lake deepened from 198 m to 202 m while the stagnant eastern half remained a few meters lower. The lake was perched 1-2 m above the rim. On 13 January a small portion of the cone collapsed, causing a second vent to open adjacent to the main vent and effuse lava for less than 20 minutes. The islands remained stationary in the E part of the lake; the dimensions of the largest island remained unchanged. The sulfur dioxide emission rate was 4,700 tons/day on 14 January.

    Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

  • Tue, 19 Jan 2021 04:48:12 -0700: Pelee (France) - Report for 13 January-19 January 2021 - NEW - Smithsonian / USGS Weekly Volcanic Activity Report

    L'Observatoire Volcanologique et Sismologique de Martinique (OVSM) reported that seismicity at Pel�e remained at significant levels during 8-15 January, though had slightly decreased compared to the previous week. The seismic network recorded at least 22 high-frequency, volcano-tectonic earthquakes with magnitudes less than 1, located at shallow depths between 600 and 1,000 m above sea level. Two low-frequency, long-period earthquakes were also noted. The Alert Level remained at Yellow (the second lowest level on a four-color scale).

    Source: L'Observatoire Volcanologique et Sismologique de Martinique (OVSM)

  • Tue, 19 Jan 2021 04:48:12 -0700: Ebeko (Russia) - Report for 13 January-19 January 2021 - Smithsonian / USGS Weekly Volcanic Activity Report

    Volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, observed explosions during 7-10 and 13-14 January; ash plumes rose up to 4.5 km (14,800 ft) a.s.l. and drifted E. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

    Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

  • Tue, 19 Jan 2021 04:48:12 -0700: Sarychev Peak (Russia) - Report for 13 January-19 January 2021 - NEW - Smithsonian / USGS Weekly Volcanic Activity Report

    KVERT reported that a thermal anomaly over Sarychev Peak was identified during 7-10 and 12-13 January. A gas-and-steam plume drifted 40 km NE on 12 January. The Aviation Color Code was raised to Yellow (the second lowest level on a four-color scale) on 10 January.

    Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

  • Tue, 19 Jan 2021 04:48:12 -0700: Langila (Papua New Guinea) - Report for 13 January-19 January 2021 - NEW - Smithsonian / USGS Weekly Volcanic Activity Report

    Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that on 13 January an ash plume from Langila produced an ash plume that rose to 3 km (10,000 ft) a.s.l. and drifted WSW.

    Source: Darwin Volcanic Ash Advisory Centre (VAAC)

  • Tue, 19 Jan 2021 04:48:12 -0700: Soufriere St. Vincent (Saint Vincent and the Grenadines) - Report for 13 January-19 January 2021 - NEW - Smithsonian / USGS Weekly Volcanic Activity Report

    University of the West Indies Seismic Research Centre (UWI-SRC) and National Emergency Management Organisation (NEMO) reported that the lava dome in Soufri�re St. Vincent?s main crater continued to grow during 13-19 January. Observations on 14 January revealed that the dome was growing taller as well as expanding to the E and W. During an overflight on 15 January scientists saw extensive vegetation damage on the E, S, and W inner crater walls; damage previously noted along the upper part of the SW crater rim had expanded downslope. The dome dimensions were estimated to be 340 m long, 160 m wide, and 90 m high. Scientists visited the dome on 16 January and collected rock samples from the W part of the dome. They recorded temperatures around 590 degrees Celsius from the expanding dome front. Gas emissions were most notable from a small circular depression at the top of the dome. At night during 15-17 January residents to the W saw incandescence emanating from the crater, a phenomenon likely to be more frequent as the dome grows higher. Gas emissions were visible in the afternoon of 17 January rising from the top of the dome as well as from areas of contact between the new and old domes. An area of burnt vegetation extended from the dome along the W part of the crater floor. By the end of the week both new seismic and continuous GPS monitoring stations had been installed and were transmitting data, bring the total number of dedicated seismic stations to five. The Alert Level remained at Orange (the second highest level on a four-color scale).

    Sources: National Emergency Management Organisation (NEMO), Government of Saint Vincent and the Grenadines,University of the West Indies Seismic Research Centre (UWI-SRC)

  • Tue, 19 Jan 2021 04:48:12 -0700: Suwanosejima (Japan) - Report for 13 January-19 January 2021 - NEW - Smithsonian / USGS Weekly Volcanic Activity Report

    JMA reported that incandescence at Suwanosejima?s Ontake Crater was visible nightly during 11-15 January. Intermittent explosions produced ash plumes that rose as high as 1.4 km above the crater rim and ejected bombs 400 m away from the crater. The Alert Level was lowered to 2 (on a 5-level scale) on 14 January; JMA noted that no large bombs were ejected more than 1 km from the crater beginning on 29 December 2020.

    Source: Japan Meteorological Agency (JMA)

  • Tue, 19 Jan 2021 04:48:12 -0700: Karymsky (Russia) - Report for 13 January-19 January 2021 - Smithsonian / USGS Weekly Volcanic Activity Report

    KVERT reported that a thermal anomaly over Karymsky was visible in satellite images during 8-15 January. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

    Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

  • Tue, 19 Jan 2021 04:48:12 -0700: Shishaldin (United States) - Report for 13 January-19 January 2021 - Smithsonian / USGS Weekly Volcanic Activity Report

    AVO reported that several outages affected GPS, seismic, and infrasound stations used to monitor Shishaldin. On 15 January AVO changed both the Aviation Color Code and the Volcano Alert Level to Unassigned, reflecting the lack of this data to detect unrest. The volcano continued to be monitored with local webcams, satellite data, and remote infrasound, seismic, and lightning networks.

    Source: US Geological Survey Alaska Volcano Observatory (AVO)

  • Tue, 19 Jan 2021 04:48:12 -0700: Lewotolo (Indonesia) - Report for 13 January-19 January 2021 - Smithsonian / USGS Weekly Volcanic Activity Report

    PVMBG reported that a Strombolian eruption at Lewotolo continued during 13-19 January. Gray-and-white ash plumes rose 200-700 m above the summit daily and rumbling sounds were reported. Strombolian explosions ejected material 100-500 m above the summit, and incandescent material was ejected as far as 1.5 km SE from the crater. The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 4 km away from the summer crater.

    Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

  • Tue, 19 Jan 2021 04:48:12 -0700: Dukono (Indonesia) - Report for 13 January-19 January 2021 - Smithsonian / USGS Weekly Volcanic Activity Report

    Based on satellite and wind model data, the Darwin VAAC reported that during 13-14 January ash plumes from Dukono rose to 2.1 km (7,000 ft) a.s.l. and drifted E and WSW. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone.

    Sources: Darwin Volcanic Ash Advisory Centre (VAAC),Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)


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Updated: March 12, 2011 — 12:36 pm

The Author

Rich Fleetwood

Rich is the founder of SurvivalRing, now in it's 24th year, author of multimedia CDs and DVDs, loves the outdoors, his family, his geeky skill-set, and lives in rural southern Wyoming, just below the continental divide (long story, that...). Always ready to help others, he shares what he learns on multiple blogs, many social sites, and more. With a background in preparedness and survival skills, training with county, state, and national organizations, and skills in all areas of media and on air experience in live radio and television, Rich is always thinking about the "big picture", when it comes to helping individuals and families prepare for life's little surprises.

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