Activity for the week of 27 June-3 July 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
| 14.473°N, 90.88°W
| Elevation 3763 m
INSIVUMEH reported that on 27 June, a new 100-m-long lava flow from Fuego was observed that somewhat paralleled the previous flow from March/April 2007. The older lava flow on the S flank continued to advance and produce incandescent blocks that rolled W into the Taniluyá River valley. On 29 June, pyroclastic explosions propelled material about 75 m above the crater. Seven explosions produced whitish plumes to an altitude of about 4 km (13,100 ft) a.s.l. and drifted S.
According to CONRED, INSIVUMEH reported on 1 July that during a Strombolian eruption, lava was propelled 200-300 m above the summit. Resulting lava flows traveled about 800 and 1,300 m to the W. Rumbling sounds were heard and shockwaves rattled windows in near by villages. Ash plumes rose to an altitude of 3.9 km (12,800 ft) a.s.l. and drifted W. Multiple pyroclastic flows traveled 1.3-2 km to the W. Based on the report, CONRED raised the Alert Level to Orange in surrounding communities.
Sources: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Coordinadora Nacional para la Reducción de Desastres (CONRED)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
During 27 June-2 July, views of Kilauea's Pu'u 'O'o crater were obscured by steam. Active lava was not visible anywhere on the flow field or at the site of the 18-19 June eruption. Fuming from the W base of Kane Nui o Hamo and diffuse patches of rain-induced steaming were visible on the Mauna Ulu web camera.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| Central Kamchatka (Russia)
| 56.056°N, 160.642°E
| Elevation 4754 m
KVERT reported that during 22-29 June, seismic activity at Kliuchevskoi continued above background levels. Based on atmospheric profiles, ash plumes rose to estimated altitudes of 4.5-9.5 km (14,800-31,200 ft) a.s.l. and drifted in multiple directions during 21-24 and 28 June. A thermal anomaly continued to be detected in the crater on satellite imagery during 22-23 and 26-27 June. On 28 June, seismicity increased and indicated that an ash plume rose to an altitude of 9 km (30,000 ft) a.s.l. The Level of Concern Color Code was raised to Red.
Ash plumes were visible on satellite imagery drifting E more than 2,000 km on 29 June and drifting SW more than 900 km on 30 June. Based on video and visual observations, ash plumes rose to an altitude greater than 10 km (32,000 ft) a.s.l. and drifted W on 30 June. Ash plumes were visible on satellite imagery drifting E. On 1 July, plumes drifted N.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
During 22-29 June, seismic activity at Karymsky was above background levels and possibly indicated ash plumes to an altitude of 4.7 km (15,400 ft) a.s.l. all days. A steam-and-gas plume was visible on satellite imagery on 27 June.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 19.023°N, 98.622°W
| Elevation 5393 m
Based on information from the Mexico City MWO and a web camera operated by CENEPRED, the Washington VAAC reported that an ash plume from Popocatépetl rose to an altitude of 6.4 km (21,000 ft) a.s.l. and drifted SSW on 28 June.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| New Britain (Papua New Guinea)
| 4.271°S, 152.203°E
| Elevation 688 m
RVO reported that on 30 June and 2 July, explosions from Rabaul caldera's Tavurvur cone produced shockwaves that rattled windows of houses in Rabaul Town and surrounding areas. Ash plumes rose to altitudes of 2.7-3.7 km (8,900-12,100 ft) a.s.l. and drifted N and NW. Ashfall was reported from areas downwind. Incandescence was visible at the summit.
Source: Rabaul Volcano Observatory (RVO)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
KVERT reported that seismic activity at Shiveluch continued above background levels during 22-29 June. Based on seismic interpretation, ash plumes rose to an altitude of 6.5 km (21,300 ft) a.s.l. during the reporting period. A large thermal anomaly was detected in the crater on satellite imagery all days. The Level of Concern Color Code remained at Orange.
Based on information from KEMSD, the Tokyo VAAC reported that an eruption plume rose to 4.6 km (15,000 ft) a.s.l. during 27-28 June. Ash was not identified on satellite imagery.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
| 16.72°N, 62.18°W
| Elevation 915 m
MVO reported that during 22-29 June the lava dome at Soufrière Hills changed very little based on visual observations, and seismic activity was very low. Low-level rockfall and pyroclastic flow activity continued, however, and predominantly affected the Tar River Valley to the E. The volume of the dome was an estimated 208 million cubic meters. The Alert Level remained at 4 (on a scale of 0-5).
Source: Montserrat Volcano Observatory (MVO)
| United States
| 46.2°N, 122.18°W
| Elevation 2549 m
Data from deformation-monitoring instruments indicated that during 27 June-3 July lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. In some instances, clouds inhibited visual observations.
Source: US Geological Survey Cascades Volcano Observatory (CVO)
| 1.467°S, 78.442°W
| Elevation 5023 m
IG reported that on 27 June, ash plumes from Tungurahua rose to an altitude of 7.5 km (24,600 ft) a.s.l. and drifted NW, W, and SW. Ashfall was reported from areas to the SW. Observers from the NW reported reddish material at the summit. A lahar occurred in a NNW drainage. Roaring noises were reported during 27-28 June. On 2 July, ashfall was reported from areas to the SW.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
| 16.355°S, 70.903°W
| Elevation 5672 m
Based on pilot observations and Significant Meteorological Information (SIGMET) advisories, the Buenos Aires VAAC reported that Ubinas produced ash plumes during 27-28 June to altitudes of 5.5-7 km (18,000-23,000 ft) a.s.l. Plumes drifted SW, NE, and E. A diffuse ash plume was visible on satellite imagery on 2 July.
Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
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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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