Activity for the week of 30 May-5 June 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
| Central Kamchatka (Russia)
| 56.056°N, 160.642°E
| Elevation 4754 m
KVERT reported on 1 June that the Level of Concern Color Code for Kliuchevskoi was lowered from Red to Orange. During 25 May-1 June, seismic activity continued above background levels and a thermal anomaly in the crater was detected on satellite imagery. According to video data and visual observations on 27 and 31 May, there was Strombolian and Vulcanian activity at the summit crater, lava flows, and phreatic bursts on the NW flank from where lava interacted with ice. Ash plumes rose to altitudes of 5-7 km (16,000-26,200 ft) a.s.l. during 29-31 May and drifted in multiple directions. Strong phreatic bursts were seen from the front of a new lava flow from on the E flank on 31 May.
Based on information from KVERT, the Tokyo VAAC reported that ash emissions produced plumes on 2 and 5 June to an altitude of about 5.8 km (19,000 ft) a.s.l. Ash was not identified on satellite imagery. During 3-4 June, ash plumes to altitudes of 5.2-7 km (17,000-23,000 ft) a.s.l. were possibly identified on satellite imagery.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
| 38.692°S, 71.729°W
| Elevation 3125 m
Based on a Significant Meteorological Information (SIGMET) advisory and information from the Puerto Montt Flight Information Region (FIR), the Buenos Aires VAAC reported that an ash plume from Llaima rose to an altitude of 3 km (10,000 ft) a.s.l. on 29 May. The plume drifted E. Ash was not identified on satellite imagery.
Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
| Kyushu (Japan)
| 31.593°N, 130.657°E
| Elevation 1117 m
Based on information from JMA, the Tokyo VAAC reported that ash plumes from Sakura-jima rose straight up to altitudes of 2.1-2.4 km (7,000-8,000 ft) a.s.l. during 31 May-1 June. During 4-5 June, plumes again rose to the same altitudes as during 31 May-1 June and drifted W, NW, and E. Ash was not detected on satellite imagery.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
| 19.514°N, 103.62°W
| Elevation 3850 m
Based on observations of satellite imagery, the Washington VAAC reported that diffuse ash plumes from Colima drifted SW and S on 31 May.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
Seismic activity at Karymsky was slightly above background levels during 25 May-1 June. Visual observations were not possible due to cloud cover. 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 30 May-5 June, lava from Kilauea flowed SE across a growing lava delta into the ocean at the Poupou entry. By 24 May, lava no longer entered the ocean at the Kamokuna entry. Incandescence was visible from several vents in the Pu'u 'O'o crater and from breakouts above the Pulama pali fault scarp. The earthquake swarm that began on 12 May continued S of Halema'uma'u and in the upper E rift zone. On 18 May, a large lava flow broke out of the PKK lava tube at the site of an old skylight named Petunia. By 4 June, the Petunia flow advanced 2 km. Also on 4 June, a M 3.8 earthquake occurred about 4 km NE of Pahala town. Surface flow activity was seen on the E flow-field between Royal Gardens subdivision and the coast.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| New Britain (Papua New Guinea)
| 5.525°S, 148.42°E
| Elevation 1330 m
RVO reported that the emission of ash clouds from Langila's Crater 2 continued during 22 May-1 June and were occasionally accompanied by roaring noises. Two large explosions on 30 May produced ash plumes that rose to an altitude of 5.3 km (17,400 ft) a.s.l. and drifted NW. Ash plumes rose to altitudes of 3.3-4.3 km (10,800-14,100 ft) a.s.l. and drifted NW during 22 May-1 June. Ashfall was reported from Kilenge Catholic Mission (about 10 km NW of the volcano) and surrounding areas during the last few days of May and 1 June. Incandescence was visible on 29 and 31 May. Crater 3 was quiet. Based on observations of satellite imagery and information from RVO, the Darwin VAAC reported that an ash plume rose to an altitude of 3 km (10,000 ft) a.s.l. on 3 June and drifted W.
Sources: Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC)
| Papua New Guinea
| 4.08°S, 145.037°E
| Elevation 1807 m
Based on satellite image observations and information from RVO, the Darwin VAAC reported that diffuse plumes from Manam rose to an altitude of 3 km (10,000 ft) a.s.l. on 5 June and drifted WNW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Nevado del Huila
| 2.93°N, 76.03°W
| Elevation 5364 m
Based on seismic interpretation, INGEOMINAS reported ash emissions from Nevado del Huila during 27 May that were confirmed later that day by aerial observations. Tremor on 28 May possibly indicated another pulse of ash emissions. Sulfur-dioxide flux measured 3,000 metric tons per day on 1 June and about 6,900 metric tons per day on 2 June.
Source: Servicio Geológico Colombiano (SGC)
| 14.382°N, 90.601°W
| Elevation 2569 m
INSIVUMEH reported that on 31 May, and 1 and 5 June, lava from the NE flank of Pacaya's MacKenney Cone continued to flow and pooled between the base of the volcano and the plateau. Gas plumes from the summit drifted N and SW and rose to altitudes of 2.8 km (9,200 ft) a.s.l. on 5 June. Small pyroclastic explosions from the N part of MacKenney Cone were occasionally observed.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
KVERT reported that seismic activity at Shiveluch continued above background levels during 25 May-1 June. Based on seismic interpretation, ash plumes possibly rose to an altitude of 9.5 km (31,200 ft) a.s.l. throughout the reporting period. According to visual observation and video data, gas-and-steam and ash plumes rose to altitudes of 5-6 km (16,400-19,700 ft) a.s.l. during 27-28 and 30-31 May. Plumes were seen on satellite imagery drifting SW during 27-28 May. A large thermal anomaly was also visible on satellite imagery. The Tokyo VAAC reported that based on reports from KEMSD, an eruption plume rose to an altitude of 6.4 km (21,000 ft) a.s.l. on 2 June. The Level of Concern Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 16.72°N, 62.18°W
| Elevation 915 m
MVO reported that during 25 May-1 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. On 31 May, pyroclastic flows traveled approximately 1 km E in the Tar River Valley. 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 30 May-5 June 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 general, gas and steam plumes from the active lava dome, as well as dust plumes resulting from rockfalls, occasionally rise above the crater rim; a gas plume may have been visible on 3 June. In some instances, clouds inhibited visual observations.
Source: US Geological Survey Cascades Volcano Observatory (CVO)
| 1.467°S, 78.442°W
| Elevation 5023 m
During 30 May-5 June, IG reported that ash plumes intermittently visible from Tungurahua rose to altitudes of 6-7 km (19,700-23,000 ft) a.s.l. and drifted mainly SW, W, and NW. Ashfall was reported from areas downwind between 30 May and 3 June. Muddy waters traveled down W, SW, and NW drainages during 30 May-1 June. Lahars were reported from the Choglontus drainage to the WSW on 30 May and from the Motilones drainage to the WNW on 1 June. During 4-5 June, roaring noises were reported.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
| 16.355°S, 70.903°W
| Elevation 5672 m
Based on observations from satellite imagery and Significant Meteorological Information (SIGMET) advisories, the Buenos Aires VAAC reported that during 30 May-3 June and on 6 June ash plumes from Ubinas rose to altitudes of 3.7-7.6 km (12,000-25,000 ft) a.s.l. Plumes drifted NE, ESE, and SSE.
Source: Buenos Aires 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.
3. Preliminary accounts sometimes contain exaggerations and "false alarms," and accordingly, this report may include some events ultimately found to be erroneous or misleading.
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