Activity for the week of 8 August-14 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
| 14.473°N, 90.88°W
| Elevation 3763 m
INSIVUMEH reported that on 8 August, a Strombolian eruption of Fuego produced gas-and-ash plumes that rose to altitudes of 4.8-5.6 km (15,700-18,400 ft) a.s.l. and drifted W and SW. Lava flows advanced and avalanches of incandescent blocks traveled down river valleys, including the Ceniza river valley to the SW. Several pyroclastic flows descended the flanks and ashfall was reported in villages to the W, SW, and S. CONRED raised the Alert Level to Orange (level 3 on a scale of 1-4) in surrounding communities on 8 August, based on a later report from INSIVUMEH.
On 9 August, there was a substantial decrease in vigor of the Strombolian eruption. Explosions produced plumes to altitudes of 4.4-4.8 km (14,400-15,700 ft) a.s.l. and drifted SW. A lava flow traveled 1.5 km SW down the Ceniza river valley and landslides of incandescent blocks were observed. INSIVUMEH issued a report later that day stating that the activity had further decreased to normal levels. A few explosions produced plumes to an altitude of 4.3 km (14,100 ft) a.s.l. and drifted SW.
On 10 August, CONRED decreased the Alert Level to Yellow. INSIVUMEH reported that the lava flows that were active during 8-9 August were no longer visible. On 10 and 13 August, small explosions produced plumes to an altitude of 4.3 km (14,100 ft) a.s.l. and drifted SW.
Sources: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Coordinadora Nacional para la Reducción de Desastres (CONRED)
| Siau Island (Indonesia)
| 2.781°N, 125.407°E
| Elevation 1797 m
The Alert Status of Karangetang was raised on 11 August from 2 to 3 (on a scale of 1-4) due to increased eruptive activity. Tremors increased during 5-8 August. According to news articles, lava and pyroclastic flows that were observed on 10 August, prompted authorities to evacuate more than 500 people from villages on the slopes. During the reporting period, a lava fountain rose 25-75 m above the summit.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), News.com.au - News Limited
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
HVO reported that fissure segment D from Kilauea's 21 July fissure eruption remained active during 8-14 August. The 'a'a flow from segment D advanced 760 m during 8-11 August and overflowed the N side of the channel multiple times during 10-12 August. On 13 August, an extension of the lava flow formed in an area of frequent overflows. Smoke from burning vegetation was visible near the flow front. Fissure segment C produced small lava flows during 8-10 August but only fumes during 11-14 August.
Incandescence was visible on the web camera from E and W vents in Pu'u 'O'o's crater on 11 August. A few small earthquakes were located beneath Halema'uma'u crater, the S flank, and the SW rift zone during 8-13 August. On 13 August, a M 5.4 earthquake was located beneath the S flank at a depth of 9 km.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| 38.692°S, 71.729°W
| Elevation 3125 m
Based on pilot observations, the Buenos Aires VAAC reported that an ash plume from Llaima rose to an altitude of 5.2 km (17,000 ft) a.s.l. on 8 August and drifted E. Ash was not identified on satellite imagery.
Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
| Costa Rica
| 10.025°N, 83.767°W
| Elevation 3340 m
OVSICORI reported that from mid-June through 8 August, several changes occurred at Turrialba, including opened fractures, spreading fumaroles, and an acute impact of gases on vegetation. Wide spreading of fumaroles on the upper edifice correlated with enhanced seismicity in mid-July. The principle fumarole in the bottom of the W crater reached 138 degrees C and produced a distinctive sound of a "high pressure valve" heard as far as 500 m away. The fumarole melted observable amounts of sulfur, a phenomenon not seen by the OVSICORI team in 25 years of continuous monitoring.
Multiple cracks associated with the expansion of the fumarolic areas around crater W were noted. A wide fumarolic field resided between two cracks about 100 m in length that propagated radially from the W and NW crater edges. Vegetation on the NW, W, and SW flanks appeared yellowish and dark brown, and patches of forest burned. Effects from the gases were observed in commercial farming areas.
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
| Costa Rica
| 10.463°N, 84.703°W
| Elevation 1670 m
In July, activity originating from Arenal's Crater C consisted of gas emissions, sporadic Strombolian eruptions, lava flows traveling SW and S, and occasional avalanches from lava-flow fronts. Blocks from the lava-flow fronts periodically reached vegetation and started small fires. Volcanic activity was at relatively low levels and few eruptions occurred. Small amounts of pyroclastic material were ejected and affected the NE and SE flanks. Eruptions produced ash plumes that rose about 2.2 km (7,100 ft) a.s.l. Ash and acid rain fell on the NE and SE flanks. Small avalanches of volcanic material traveled down several ravines. Crater D showed only fumarolic activity.
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
| Chuginadak Island (USA)
| 52.825°N, 169.944°W
| Elevation 1730 m
Clouds obscured satellite and web camera views of Cleveland volcano during 8-13 August. A few clear views of the crater during 13-14 August revealed multiple thermal anomalies. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
Seismic activity at Karymsky was above background levels during 3-10 August, with 300-800 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. The Level of Concern Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Central Java (Indonesia)
| 7.54°S, 110.446°E
| Elevation 2910 m
Based on a pilot observation, the Darwin VAAC reported that an ash plume from Merapi rose to an altitude of 4.6 km (15,000 ft) a.s.l. and drifted W on 9 August. Ash was not identified on satellite imagery.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| New Britain (Papua New Guinea)
| 4.271°S, 152.203°E
| Elevation 688 m
RVO reported that during 7-13 August, ash plumes from Rabaul caldera's Tavurvur cone rose to an altitude of 1.7 km (5,600 ft) a.s.l. and drifted N and NW. On 8 August, ashfall greater than 5 mm thickness was reported in Rabaul Town. During 10-13 August, ashfall was reported from areas downwind, including Rabaul Town. Rumbling and jet-like noises were heard and incandescence was seen at the crater during the reporting period.
Source: Rabaul Volcano Observatory (RVO)
| 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 3-10 August. Based on seismic interpretation, avalanches and ash plumes that rose to an altitude of 6 km (19,700 ft) a.s.l. occurred during the reporting period. Observations of satellite imagery revealed that a thermal anomaly was present in the crater during 2-5 and 8-9 August. The Level of Concern Color Code remained at Orange.
Based on information from KEMSD, the Tokyo VAAC reported that ash plumes rose to altitudes of 4.6-10.1 km (15,000-33,000 ft) a.s.l. during 12-13 August. Based on seismic interpretation, a high plume occurred again on 13 August. Ash was not identified on satellite imagery.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
| Sulawesi (Indonesia)
| 1.112°N, 124.737°E
| Elevation 1785 m
According to news articles, an eruption from Soputan on 14 August produced ash plumes to an altitude of 3.3 km (10,800 ft) a.s.l. Lava and rock avalanches were also observed. On 15 August, seismic activity decreased. The Alert Level remained at 3 (on a scale of 1-4).
Sources: Reuters, Associated Press, Antara News
| 16.72°N, 62.18°W
| Elevation 915 m
MVO reported that during 3-13 August the lava dome at Soufrière Hills changed very little, based on visual observations. Seismic activity was very low and low-level rockfall activity continued. On 10 August, lahars were detected in all drainages due to heavy rainfall. 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 8-14 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 during 8-9 August, steam-and-ash plumes from Tungurahua rose to a maximum altitude of 6 km (19,700 ft) a.s.l. and drifted W and SW. Ashfall was reported from areas SW and W on 8 August. Explosions on 9, 12, and 13 August sounded similar to "cannon shots" and vibrated windows in areas to the W and SW. Incandescent material was observed inside the crater and fell on the flanks. On 11 August, lahars traveled down NW drainages and disrupted the route between Ambato and Baños. Clouds obscured views during 10-12 August.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
| 16.355°S, 70.903°W
| Elevation 5672 m
Based on satellite imagery, the Buenos Aires VAAC reported that an eruption plume from Ubinas rose to an altitude of 6.1 km (20,000 ft) a.s.l. and drifted SE on 9 August.
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.
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