Activity for the week of 19 February-25 February 2014
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
| Kyushu (Japan)
| 31.593°N, 130.657°E
| Elevation 1117 m
JMA reported that during 17-21 February three explosions from Showa Crater at Aira Caldera’s Sakurajima volcano ejected tephra as far as 1,300 m. The Alert Level remained at 3 (on a scale of 1-5). The Tokyo VAAC reported that explosions during 19-20 and 22-25 February generated ash plumes that rose to altitudes of 1.8-3.7 km (6,000-12,000 ft) a.s.l. and drifted NE, SE, and S. A pilot observed ash on 20 February.
Sources: Japan Meteorological Agency (JMA), Tokyo Volcanic Ash Advisory Center (VAAC)
| Kyushu (Japan)
| 32.884°N, 131.104°E
| Elevation 1592 m
JMA reported that a very small explosion from Asosan's Nakadake Crater occurred on 19 February. An off-white plume rose 200 m above the crater rim and drifted SW. During fieldwork on 21 February volcanologists noted that sulfur dioxide emissions remained high. The Alert Level remained at 2 (on a scale of 1-5).
Source: Japan Meteorological Agency (JMA)
| Eastern Java (Indonesia)
| 7.93°S, 112.308°E
| Elevation 1731 m
PVMBG reported that on 14 February, the day after a large eruption at Kelut that began at 2250 on 13 February, gray-to-black plumes rose 400-600 m above the crater. On 15 February grayish white plumes rose as high as 3 km. During 16-20 February white plumes rose as high as 1 km and drifted N, NE, and E. Heavy rain on 18 February caused lahars in Ngobo, Mangli (Kediri, 35 km WNW), Bladak (Blitar, 20 km SW), and Konto (Malang, 35 km E). BNPB noted that the lahars flooded five houses and one mosque, and destroyed two homes and one bridge.
The report noted that four out of the five seismic stations monitoring Kelut were destroyed during the eruption. The one remaining station, 5 km away, recorded declining seismicity during 14-20 February. Two more seismic stations were installed, 2-3 km from the crater, on 16 February. The Alert Level was lowered to 3 on 20 February. Visitors and residents were prohibited from approaching the crater within a radius of 5 km; residents outside of the 5-km restricted zone were permitted to return home.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Badan Nacional Penanggulangan Bencana (BNPB)
| 0.38°S, 100.474°E
| Elevation 2885 m
According to a news article from 5 February four explosions from Marapi occurred in early February. One of the explosions was followed by ashfall in the Tarab River area and Batu Sangkar (17 km SE).
Source: Metro TV News
| 19.023°N, 98.622°W
| Elevation 5393 m
CENAPRED reported that at 0944 on 19 February a gas-and-vapor plume containing moderate amounts of ash rose 1.5 km above Popocatépetl's crater and drifted NE and SW. At 2338 a gas-and-vapor plume containing small amounts of ash rose 1 km and drifted E. A small explosion at 0409 on 21 February ejected incandescent tephra which mostly fell back inside the crater, and produced an ash plume that rose 2 km. An explosion at 1233 ejected incandescent tephra 600 m from the crater rim. An ash plume rose 4 km and drifted NE. Another explosion at 1541 produced an ash plume with lower ash content that rose 2 km and also drifted NE. At 0312 on 22 February an explosion generated an ash plume that rose 2 km and drifted SE. Explosions at 0615 and 0619 ejected incandescent tephra and produced ash plumes that rose 1 km and drifted SE. On 25 February steam-and-gas plumes drifting SE were occasionally seen during times of good visibility. The Alert Level remained at Yellow, Phase Two.
Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
| 1.467°S, 78.442°W
| Elevation 5023 m
IG reported that activity at Tungurahua was at moderate-to-high levels during 19-25 February; cloud cover often prevented observations. On 20 February ash plumes rose 2-3.5 km above the crater and drifted SW. Ashfall was reported in Píllate (8 km W), Quero (20 km NW), and Tizaleo (29 km NW). The next day observers reported blocks rolling down the flanks. Ash fell in Píllate on 23 February.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
| Kuril Islands (Russia)
| 48.98°N, 153.48°E
| Elevation 724 m
SVERT reported that a thermal anomaly over Chirinkotan was observed in satellite images on 20 February. Cloud cover obscured views on other days during 17-24 February. The Aviation Color Code remained at Yellow.
Source: Sakhalin Volcanic Eruption Response Team (SVERT)
| Kuril Islands (Russia)
| 46.532°N, 150.871°E
| Elevation 742 m
SVERT reported that a thermal anomaly over Snow, a volcano of Chirpoi, was detected in satellite images during 19-20 February. Cloud cover obscured views on the other days during 17-24 February. The Aviation Color Code remained at Yellow.
Source: Sakhalin Volcanic Eruption Response Team (SVERT)
| Chuginadak Island (USA)
| 52.825°N, 169.944°W
| Elevation 1730 m
AVO reported that small explosions from Cleveland were detected by infrasound and lightning alarms at 1917 on 24 February and 0135 on 25 February. Small ash clouds from the explosions were detected in satellite images several hours after the events drifting at an altitude of about 5 km (16,000 ft) a.s.l. The Volcanic Alert Level remained at Advisory and the Aviation Color Code remained at Yellow.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
| Halmahera (Indonesia)
| 1.693°N, 127.894°E
| Elevation 1229 m
Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 20 and 22-23 February ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 55-150 km E, SE, and SSE.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Sicily (Italy)
| 37.748°N, 14.999°E
| Elevation 3295 m
INGV reported that during 19-22 February Strombolian activity continued at Etna's New Southeast Crater (NSEC) and produced diffuse ash plumes. Lava continued to flow from a vent on the lower part of the NSEC cone to the W wall of the Valle del Bove. An unstable part of the lower E flank of the cone that collapsed on 11 February continued to produce small collapses with reddish ash clouds, and thermal anomalies.
Source: Sezione di Catania - Osservatorio Etneo (INGV)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
KVERT reported that Vulcanian and Strombolian activity at Karymsky continued during 14-21 February. Satellite images detected a daily thermal anomaly on the volcano. 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 19-25 February HVO reported that the circulating lava lake occasionally rose and fell in the deep pit within Kilauea's Halema'uma'u Crater. Gas emissions remained elevated. The plume from the vent continued to deposit variable amounts of ash, spatter, and Pele's hair onto nearby areas. At Pu'u 'O'o Crater, glow emanated from spatter cones on the N and S portions of the crater floor, and a lava pond was active in the NE spatter cone. The 7.8-km-long Kahauale’a 2 lava flow, fed by the NE spatter cone, stalled in mid-January but remained active with scattered break-out flows behind the flow front that burned adjoining forest.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| 40.59°S, 72.117°W
| Elevation 2236 m
Based on analyses of satellite images, the Buenos Aires VAAC reported that on 24 February a diffuse plume possibly containing ash from the Cordón Caulle rift zone, part of the Puyehue-Cordón Caulle volcanic complex, was lifted from the surface by the wind.
Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
KVERT reported that during 14-21 February lava-dome extrusion at Shiveluch was accompanied by ash explosions, incandescence, and fumarolic activity. A thermal anomaly was detected daily in satellite images. On 19 February a gas-and-steam plume containing small amounts of ash rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted about 50 km SSE. On 25 February satellite images detected ash plumes that rose to altitudes of 4-4.5 km (13,100-14,800 ft) a.s.l. and drifted SE. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 3.17°N, 98.392°E
| Elevation 2460 m
On 19 February BNPB reported that villagers outside of the 5-km evacuation zone around Sinabung continued to return to their homes. Based on wind data and satellite images, the Darwin VAAC reported that during 19 and 21-22 February ash plumes rose to an altitude of 4.6 km (15,000 ft) a.s.l. and drifted 25-35 km NE and SW. Ash plumes were visible in webcam images during 23-25 February; ash plumes rose to altitudes of 3.7-4.6 km (12,000-15,000 ft) a.s.l. on 25 February and drifted 45 km E. On 24 February BNPB noted that 16,361 people remained in 34 evacuation shelters. Dense white plumes rose 100-300 m above the dome and incandescent material as far as 2 km SE from the dome was observed.
Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Badan Nacional Penanggulangan Bencana (BNPB)
| Ryukyu Islands (Japan)
| 29.638°N, 129.714°E
| Elevation 796 m
The Tokyo VAAC reported an explosion from Suwanosejima on 19 February. Explosions during 23-24 February produced plumes that rose to an altitude of 1.8 km (6,000 ft) a.s.l. An ash plume on 24 February drifted E.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
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.
1. The Weekly Volcanic Activity Report is intended to provide timely information about global volcanism on a weekly basis. Consequently, the report is generated rapidly by summarizing volcanic reports from various sources, with little time for fact checking. The accuracy of the Weekly Volcanic Activity Report is dependent upon the quality of the volcanic activity reports we receive. Reports published in the Bulletin of the Global Volcanism Network are monthly, and more carefully reviewed, although all of the volcanoes discussed in the Weekly Volcanic Activity Report are not necessarily reported in the Bulletin. Because of our emphasis on rapid reporting on the web we have avoided diacritical marks. Reports are updated on the Weekly Volcanic Activity Report web page as they are received, therefore information may be included regarding events that occurred before the current report period.
2. Rapidly developing events lead to coverage that is often fragmentary. Volcanoes, their eruptions, and their plumes and associated atmospheric effects are complex phenomena that may require months to years of data analysis in order to create a comprehensive summary and interpretation of events.
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