Activity for the week of 7 February-13 February 2007
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
| 11.538°N, 85.622°W
| Elevation 1700 m
INETER reported that explosions in the crater of Concepción produced ash-and-gas plumes that traveled down the WSW flanks on 9 February. Explosions continued on 10 February and produced minor ash-and-gas plumes. No seismicity was registered.
Source: Instituto Nicaragüense de Estudios Territoriales (INETER)
| Kyushu (Japan)
| 31.593°N, 130.657°E
| Elevation 1117 m
Based on information from Japan Meteorological Agency (JMA), the Tokyo VAAC reported an explosion from Sakura-jima on 10 February. The altitude and direction of a resultant plume were not reported. On 13 February, an explosion produced a plume that rose to an altitude of 2.1 km (7,000 ft) a.s.l.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
| Andaman Islands (India)
| 12.278°N, 93.858°E
| Elevation 354 m
Based on satellite imagery, the Darwin VAAC reported that an ash plume from Barren Island reached an altitude of 3 km (10,000 ft) a.s.l. and drifted SW on 8 February.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
Seismic activity at Karymsky was above background levels during 2-9 February, with 80-400 shallow earthquakes occurring daily. Ash plumes may have reached altitudes of 4 km (13,000 ft) a.s.l. during the reporting period. The Level of Concern 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 7-13 February, lava from Kilauea continued to flow from lava deltas into the ocean at the East Lae'apuki, Kamokuna, and East Ka'ili'ili entries. Incandescence was seen from the Campout and PKK flows on the pali and from several vents in Pu'u 'O'o's crater. Tremor near Pu'u 'O'o continued at low levels.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| 2.005°S, 78.341°W
| Elevation 5286 m
Based on information from Guayaquil MWO, IG, pilot reports, and satellite imagery, the Washington VAAC reported that eruptions from Sangay during 6-10 and 13 February produced ash plumes that drifted SW, NW, N, and W. Plumes reached altitudes of 9 km (30,000 ft) a.s.l. on 6 February and 6.1 km (20,000 ft) a.s.l. on 9 February. A hotspot was seen on satellite imagery at the summit during 7-9 and 13 February.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| 14.757°N, 91.552°W
| Elevation 3745 m
Based on satellite imagery, the Washington VAAC reported that diffuse plumes from Santa María's Santiaguito lava dome complex drifted SW and S in a fan shape on 8 February. A hot spot was detected on satellite imagery.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| Eastern Java (Indonesia)
| 8.108°S, 112.922°E
| Elevation 3657 m
Based on a news report, eruption plumes from Semeru drifted E on 10 and 11 February. Ashfall was reported from areas including the town of Lumajang, about 35 km E.
Source: Agence France-Presse (AFP)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
Activity at Shiveluch continued above background levels during 2-9 February, with over 200 shallow earthquakes occurring daily. Based on seismic interpretation, observation, and video data, gas-and-ash plumes rose 4.0-5.5 km (13,100-18,000 ft) a.s.l. throughout the reporting period. Plumes drifted NE and NW. A large thermal anomaly was visible on satellite imagery. The Tokyo VAAC reported ash plumes to an altitude of 5.2-5.5 km (17,000-18,000 ft) a.s.l. on 10 and 13 February that were visible on satellite imagery. The Level of Concern Color Code remained at Orange.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
| 16.72°N, 62.18°W
| Elevation 915 m
During 7-13 February, growth of the Soufrière Hills lava dome continued on the W side. A small lobe was observed on 7 February growing to the SW. On 8 February, three pyroclastic flows traveled a maximum distance of a few kilometers E down the Tar River Valley. At least one of the pyroclastic flows was the result of a small collapse from the S or SW part of the dome. Small pyroclastic flows traveled NW down Tyres Ghaut on 9 February and down the northern flanks onto Farrell's Plain on 12 and 13 February. Based on satellite imagery, information from MVO, and pilot reports, the Washington VAAC reported that ash-and-gas and steam plumes drifted predominantly NW during 10-13 February. Plumes reached a maximum altitude of 2.7 km (9,000 ft) a.s.l. on 13 February
Based on a news article on 13 February, the lava-dome volume was approximately 250 million cubic meters, surpassing the previous record size of 240 million cubic meters in 2003.
Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC), Caribbean Net News
| United States
| 46.2°N, 122.18°W
| Elevation 2549 m
Seismicity from the growing lava dome at Mount St. Helens was low during 7-13 February. Crater views were obscured by clouds.
Source: US Geological Survey Cascades Volcano Observatory (CVO)
| Ryukyu Islands (Japan)
| 29.638°N, 129.714°E
| Elevation 796 m
Based on information from JMA and satellite imagery, the Tokyo VAAC reported that an explosion from Suwanose-jima produced an eruption plume during 7 February. The altitude and direction of the plume were not reported.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
| 1.467°S, 78.442°W
| Elevation 5023 m
During 7-13 February, visual observations of Tungurahua were limited due to inclement weather. During 12-13 February, seismicity increased and fumarolic activity was observed from the N and NE flanks. ON 13 February, a plume with moderate ash content rose to an altitude of 7 km (23,000 ft) a.s.l. and drifted NW.
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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