Activity for the week of 1 August-7 August 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
| Luzon (Philippines)
| 12.769°N, 124.056°E
| Elevation 1535 m
An explosion from Bulusan on 31 July produced an ash plume that rose to an altitude of 6.6 km (21,700 ft) a.s.l. The plume drifted WSW and WNW, causing light ashfall. According to a news article, white steam plumes rose from active craters and fissures on 2 August. The Alert Level remained at 1 (out of 5).
Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), Agence France-Presse (AFP)
| Chuginadak Island (USA)
| 52.825°N, 169.944°W
| Elevation 1730 m
A thermal anomaly in the crater of Cleveland was intermittently visible on satellite imagery during 2-6 August, though bad weather often limited observations. Photographs from 27 July and a pilot report from 2 August indicated fresh volcanic ejecta on the slopes and summit. The E portion of Chuginadak Island was dusted with ash on 3 August. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
| 14.473°N, 90.88°W
| Elevation 3763 m
INSIVUMEH reported that explosions from Fuego expelled incandescent material 50-75 m above the crater on 1 August. Incandescent avalanches traveled 500-700 m down the S and W flanks. Rumbling noises and shock waves were noted at nearby locations. On 2 August, a moderate eruption produced pyroclastic flows that traveled approximately 2 km SSW down the Ceniza River valley. A resultant ash plume rose to an altitude of 5.3 km (17,400 ft) a.s.l. and produced ashfall in areas to the S, SW, and W for several minutes.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
HVO reported that two of the four fissures from Kilauea's 21 July fissure eruption remained active during 1-7 August. The four fissures, A, B, C, and D, consecutively segment an approximately 2 km-long line that trends NE; fissure A is to the SE and fissure D is to the NE. During the reporting period, fissure C minimally fed a perched lava pond. Fissure D fed a NE-advancing 'a'a lava flow that was an estimated 3.5 km long on 1 August. The 'a'a flow entered the forest on 6 August as evident by smoke near the flow front.
Fuming was seen on Pu'u 'O'o's crater web camera images on 4, 5, and 7 August. A few small earthquakes were located beneath Halema'uma'u crater, the S flank, and an area offshore between Kilauea and Lo'ihi during 1-7 August.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| Western Java (Indonesia)
| 7.32°S, 107.73°E
| Elevation 2665 m
On 2 August, CVGHM raised the Alert Level at Papandayan from 1 to 2 (on a scale of 1-4) due to increased activity at the volcano. During 15 July-1 August, the number of volcanic earthquakes increased. By 31 July, the temperatures of fumaroles had increased 10 degrees C above normal levels in Mas crater. Temperatures were 3.5 degrees C above normal levels in Balagadama crater since 26 June. On 1 August, a diffuse white plume rose to an altitude of 2.7 km (8,900 ft) a.s.l. Associated with the increase in Alert Level, villagers and tourists were not permitted within a 1 km radius of the active craters.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
| Kyushu (Japan)
| 31.593°N, 130.657°E
| Elevation 1117 m
Based on information from JMA, the Tokyo VAAC reported an explosion from Sakura-jima on 4 August. Ash was not detected on satellite imagery.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
Seismic activity at Karymsky was above background levels during 27 July-3 August, with 150-600 shallow earthquakes occurring daily. Based on seismic interpretation, ash plumes may have risen to an altitude of 3 km (9,800 ft) a.s.l. Observations of satellite imagery revealed that a thermal anomaly was present in the crater on 31 July and 2 August and gas-and-steam plumes drifted SW on 2 August. The Level of Concern Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 19.023°N, 98.622°W
| Elevation 5393 m
According to the Washington VAAC, CENAPRED reported that on 28 July an eruption plume from Popocatépetl with minor ash content was visible on a web camera. The plume rose to an altitude of 7 km (23,000 ft) a.s.l. and drifted WSW. A pilot reported an ash plume on 3 August. Ash was not identified on satellite imagery on either day.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| New Britain (Papua New Guinea)
| 4.271°S, 152.203°E
| Elevation 688 m
RVO reported that during 22 July-1 August, white and blue vapor plumes from Rabaul caldera's Tavurvur cone rose to an approximate altitude of 0.9 km (3,000 ft) a.s.l. and drifted NNW. Roaring noises were occasionally heard and incandescence was intermittently visible at the crater rim. On 30 July, a white plume with little ash content rose to an altitude of 2.7 km (8,900 ft) a.s.l. and drifted SW. During 1-7 August, ash plumes rose to altitudes of 0.9-1.7 km (3,000-5,600 ft) a.s.l. and drifted N, NW, and W. Slight ashfall was reported at Rabaul town and surrounding areas.
Source: Rabaul Volcano Observatory (RVO)
| 2.005°S, 78.341°W
| Elevation 5286 m
Based on pilot observations, the Washington VAAC reported that an ash plume from Sangay rose to an altitude of 5.5 km (18,000 ft) a.s.l. and drifted W on 2 August. Ash was not 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 pilot observation, the Darwin VAAC reported that an ash plume, possibly from Semeru, rose to an altitude of 6.1 km (20,000 ft) a.s.l. on 6 August. Ash was not detected on satellite imagery.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
KVERT reported that seismic activity at Shiveluch was slightly above background levels during 27 July-3 August. Observations of satellite imagery revealed that a thermal anomaly was present in the crater. Based on seismic interpretation, ash plumes and avalanches occurred during the reporting period. Gas-and-steam plumes were visible drifting S on 31 July; clouds inhibited visual observations on other days. 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 27 July-3 August, the lava dome at Soufrière Hills changed very little, based on visual observations. Seismic activity was very low and low-level rockfall activity affected all sides of the dome. On 30 July, three pyroclastic flows traveled about 1.5 km down the N side of the Tar River Valley. The Alert Level remained elevated 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 1-7 August 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 1 August, ash-and-gas plumes from Tungurahua rose to altitudes of 5.5 km (18,000 ft) a.s.l. and drifted NW. Ashfall was reported from areas downwind. Noises indicating rolling blocks were heard. On 2 August, steam emissions and roaring noises were reported. On 5 August, roaring noises were reported and a steam-and-gas plume rose to an altitude of 5.1 km (16,700 ft) a.s.l. and drifted W. On 6 August, explosions were accompanied by roaring noises that were reported from the NW and SW sectors. A steam plume rose to an altitude of 5.2 km (17,100 ft) a.s.l. and drifted W on 7 August. Clouds occasionally inhibited visual observations.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
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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