Activity for the week of 4 April-10 April 2012
The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday, notices of volcanic activity posted on these pages are preliminary and subject to change as events are studied in more detail. This is not a comprehensive list of all of Earth's volcanoes erupting during the week, but rather a summary of activity at volcanoes that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed reports on various volcanoes are published monthly in the Bulletin of the Global Volcanism Network.
New Activity / Unrest
| Chuginadak Island (USA)
| 52.825°N, 169.944°W
| Elevation 1730 m
AVO reported that a small explosion from Cleveland was detected at 0112 on 4 April by distant seismic stations and infrasound arrays. Weather conditions prevented the detection of a possible eruption cloud in satellite images or by visual observation of the summit. Observations the next day revealed a thermal anomaly and that the 70-m-diameter lava dome had been destroyed by the explosion. This was the third lava dome that was erupted and subsequently destroyed by explosive events since the eruption began in July 2011.
On 6 April two short-duration explosions occurred at about 1635 and 2126. The resulting eruption clouds were ash poor and did not rise above 3 km (10,000 ft) a.s.l. Elevated surface temperatures were observed using infrared satellite images near the times of the explosions. Satellite observations were obscured by clouds during 8-10 April. No seismic information was available because Cleveland does not have a real-time seismic network.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
| 14.473°N, 90.88°W
| Elevation 3763 m
INSIVUMEH reported that during 9-10 April explosions from Fuego produced ash plumes that rose 100-900 m above the crater and drifted 10-15 km E and SE. Explosions produced shock waves detected within 8 km of the volcano. Avalanches descended the flanks.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Nevado del Ruiz
| 4.892°N, 75.324°W
| Elevation 5279 m
According to INGEOMINAS, the Observatorio Vulcanológico and Sismológico de Manizales reported that during 4-10 April seismicity at Nevado del Ruiz fluctuated but remained elevated. Sulfur dioxide emissions also remained high; occasionally a sulfur odor was reported in Manizales, about 25 km NW. On 5 April a volcano-tectonic earthquake, M 2.8, occurred below Arenas crater at a depth of 1 km, and was the highest magnitude earthquake recorded since February. During 4-6 April gas-and-steam plumes drifted NW. Gas-and-steam plumes rose 3 km above the crater on 7 April and 1.5 km above the crater on 10 April; the plumes drifted SE both days. The Alert Level remained at II (Orange; "eruption likely within days or weeks").
Source: Servicio Geológico Colombiano (SGC)
| 16.72°N, 62.18°W
| Elevation 915 m
MVO reported that during 30 March-6 April activity at the Soufrière Hills lava dome was generally at a low level and no ash-venting episodes had been detected since 23 March. The average sulfur dioxide emission rate measured during the week was 529 tonnes per day with a minimum of 200 and a maximum of 1,033. Scientists aboard a helicopter overflight on 4 April observed a new vent which had formed on 23 March; it was 30-50 m across and on the W side of the crater floor. The Hazard Level remained at 2.
Source: Montserrat Volcano Observatory (MVO)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
KVERT reported that during 30 March-6 April moderate seismic activity from Karymsky continued to be detected, and indicated that possible ash plumes rose to an altitude of 2.5 km (8,200 ft) a.s.l. Satellite imagery showed a thermal anomaly on the volcano on 29 March. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
During 4-10 April HVO reported that the circulating lava lake periodically rose and fell in the deep pit within Kilauea's Halema'uma'u Crater. Almost daily measurements indicated that the gas plume from the vent continued to deposit variable amounts of ash, and occasionally fresh spatter, nearby. Incandescence was visible from both a lava pond in a small pit on the E edge and a small spatter cone on the SE edge of the Pu'u 'O'o crater floor, and on the upper part of the lava-tube system on the E flank. Lava flows continued to advance down the pali and across the coastal plain, reaching about 1.6 km from the coast. During 6-9 April a small lava flow issued three times from a vent on the SE edge of the Pu'u 'O'o crater floor. The first two flows advanced N almost the entire width of the floor.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| Mariana Islands (USA)
| 18.13°N, 145.8°E
| Elevation 570 m
Clear-to-partly-cloudy satellite images of Pagan showed a gas-and-steam plume extending downwind from the summit vent during 30 March-6 April. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory. According to the Washington VAAC a pilot observed a plume containing a small amount of ash that rose to an altitude below 1.5 km (5,000 ft) a.s.l. on 7 April. Satellite imagery showed a gas-and-steam plume, with possible ash content, drifting 204 km SSW.
Sources: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program, Washington Volcanic Ash Advisory Center (VAAC)
| 40.59°S, 72.117°W
| Elevation 2236 m
OVDAS-SERNAGEOMIN reported that during 9-10 April satellite and web camera observations of the Cordón Caulle rift zone, part of the Puyehue-Cordón Caulle volcanic complex, showed plumes that rose no higher than 450 m above the crater. Incandescence from the crater was also observed. The Alert Level remained at Orange.
Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
| Flores Island (Indonesia)
| 8.62°S, 120.52°E
| Elevation 2350 m
CVGHM reported that during January-8 April white plumes rose 10-15 m above the Anak Ranakah lava dome and seismicity decreased. On 9 April the Alert Level was lowered to 1 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
| 14.757°N, 91.552°W
| Elevation 3745 m
Based on analyses of satellite imagery and reports from INSIVUMEH, the Washington VAAC reported that on 7 April multiple ash clouds from explosions at Santa María drifted 37 km SW and 11 km S. INSIVUMEH reported that during 8-10 April explosions from Caliente dome generated ash plumes that rose 600-900 m above the dome and drifted 15 km S and SW. Lava flows continued to produce avalanches that descended the flanks.
Sources: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Washington Volcanic Ash Advisory Center (VAAC)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
KVERT reported that explosive activity at Shiveluch continued during 29 March-6 April. Ground-based observers and satellite imagery indicated that a viscous lava flow continued to effuse in the crater formed during a 2010 eruption. Visual observations revealed that ash plumes rose to an altitude of 4 km (13,100 ft) a.s.l. on 30 March and 3 April. Seismic data indicated that ash plumes potentially rose to an altitude of 6.6 km (21,600 ft) a.s.l. every day. Satellite imagery showed a weak thermal anomaly on the lava dome during 29-31 March and 3 April, and ash plumes that drifted 114 km W, E, and NE during 29-30 March and 3 April. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Sumbawa Island (Indonesia)
| 8.25°S, 118°E
| Elevation 2850 m
CVGHM reported that during January-8 April plumes did not rise from Tambora, no changes were observed around the caldera, and seismicity decreased. On 9 April the Alert Level was lowered to 1 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
| 1.467°S, 78.442°W
| Elevation 5023 m
IG reported that during 4-8 April visual observations of Tungurahua were limited due to cloud cover. During 9-10 April ash-and-steam plumes rose 2-3 km above the crater and drifted from NE to SE. Explosions were heard in areas near the volcano. Ashfall was reported in Capil, Palictahua, and Los Toctes on 9 April. Lahars descended the W flank on 10 April and caused the road between Baños and Penipe to close.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
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Criteria & Disclaimers
The Weekly Volcanic Activity Report does not necessarily include all volcanic activity that occurred on Earth during the week. More than a dozen volcanoes globally have displayed more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. The Weekly Volcanic Activity Report summarizes volcanic activity that meets one or more of the following criteria:
- A volcano observatory raises or lowers the alert level at the volcano.
- A volcanic ash advisory has been released by a volcanic ash advisory center (VAAC) stating that an ash cloud has been produced from the volcano.
- A verifiable news report of new activity or a change in activity at the volcano has been issued.
- Observers have reported a significant change in volcanic activity. Such activity can include, but is not restricted to, pyroclastic flows, lahars, lava flows, dome collapse, or increased unrest.
Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.
It is important to note that volcanic activity meeting one or more of these criteria may occur during the week, but may not be included in the Weekly Volcanic Activity Report because we did not receive a report.
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