Activity for the week of 24 June-30 June 2009
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
| Chuginadak Island (USA)
| 52.825°N, 169.944°W
| Elevation 1730 m
A small explosive eruption of Cleveland on 25 June prompted AVO to raise the Volcano Alert Level to Watch and the Aviation Color Code to Orange. An ash cloud that detached from the volcano was seen on satellite imagery moving S at an estimated altitude of 4.6 km (15,000 ft) a.s.l. No further activity was reported. On 27 June, AVO lowered the Volcano Alert Level to Advisory and the Aviation Color Code to Yellow.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
| Matua Island (Russia)
| 48.092°N, 153.2°E
| Elevation 1496 m
SVERT reported that an intense thermal anomaly from Sarychev Peak was detected on satellite imagery during 24-30 June. Gas-and-steam plumes drifted 9 km NW on 24 June, S on 26 June, 26 km SSE on 28 June, and 40 km SE at an altitude of 3 km on 29 June.
Source: Sakhalin Volcanic Eruption Response Team (SVERT)
| Kyushu (Japan)
| 31.593°N, 130.657°E
| Elevation 1117 m
Based on information from JMA, the Tokyo VAAC reported that during 24-30 June explosions from Sakura-jima sometimes produced plumes that rose to altitudes of 2.1-3.4 km (7,000-11,000 ft) a.s.l. The plumes drifted NE, E, and S.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
| Costa Rica
| 10.463°N, 84.703°W
| Elevation 1670 m
OVSICORI-UNA reported that during May activity originating from Arenal's Crater C consisted of gas emissions, sporadic Strombolian eruptions, and occasional avalanches that traveled down the SW, S, and N flanks. Acid rain and small amounts of ejected pyroclastic material affected the NE and SE flanks. Small avalanches traveled down several ravines. Crater D produced only fumarolic activity.
A small eruption on 16 June was verified by field observations on 17 June. The eruption caused avalanches that descended the S flank to an 800-m elevation a.s.l. An ash plume drifted W.
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
| Bougainville (Papua New Guinea)
| 6.137°S, 155.196°E
| Elevation 1855 m
Based on analysis of satellite imagery, the Darwin VAAC reported that on 27 June an ash plume from Bagana rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 110 km SW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Komba Island (Indonesia)
| 7.791°S, 123.585°E
| Elevation 633 m
Based on analysis of satellite imagery, the Darwin VAAC reported that during 25-30 June ash plumes from Batu Tara rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted 35-130 km SW, W, and NW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| 42.833°S, 72.646°W
| Elevation 1122 m
Based on web camera views from the S, SERNAGEOMIN reported that during 16-23 June gas-and-ash plumes rose 1.5 km from Chaitén's growing Domo Nuevo 1 and Domo Nuevo 2 lava-dome complex. Collapses originating from unstable slopes generated block-and-ash flows. The Alert Level remained at Red. Based on SIGMET notices and web camera views, the Buenos Aires VAAC reported that during 24-25 and 27-28 June ash plumes rose to altitudes of 1.8-2.4 km (6,000-8,000 ft) a.s.l. and drifted W, S, E, and NE.
Sources: Buenos Aires Volcanic Ash Advisory Center (VAAC), Servicio Nacional de Geología y Minería (SERNAGEOMIN)
| Halmahera (Indonesia)
| 1.693°N, 127.894°E
| Elevation 1229 m
Based on analysis of satellite imagery, the Darwin VAAC reported that on 28 June an ash plume from Dukono rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 75 km N.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| 1.22°N, 77.37°W
| Elevation 4276 m
INGEOMINAS reported that during 22-23 June gas plumes rising from Galeras contained some ash. An overflight on 23 June revealed that temperatures in the main crater measured between 60 and 120 degrees Celsius, except for a small zone where the temperature measured 220 degrees Celsius. Gas emissions originated from the periphery of the main crater. On 26 June, seismicity similar to that seen prior to previous eruptions, along with low rates of gas emissions, prompted INGEOMINAS to raise the Alert Level to II (Orange; "probable eruption in term of days or weeks").
Source: Servicio Geológico Colombiano (SGC)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
During 24-30 June, HVO reported that lava flowed SE from underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex through a lava tube system, reaching the Waikupanaha and Kupapa'u ocean entries. Thermal anomalies detected in satellite images and visual observations revealed active surface flows on the pali and on the TEB flow field. Explosions from both ocean entries were occasionally reported. On 28 June, officials reported a wide swath of lava flows descending the pali.
The vent in Halema'uma'u crater continued to produce a predominantly white plume that drifted mainly SW. Small amounts of ash-sized tephra, including Pele's hair and fresh spatter, were retrieved from collection bins placed near the plume during the reporting period. A molten lava pool (54 m in diameter) near the base of the cavity, about 290 m below the floor of the crater, produced incandescence of variable brightness. The level of the lava pond rose periodically. Sounds resembling rushing gas and rockfalls were occasionally heard in the vicinity of the crater. The sulfur dioxide emission rate at the summit remained elevated; measurements were 800 tonnes per day on 24 and 26 June. The 2003-2007 average rate was 140 tonnes per day.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| New Britain (Papua New Guinea)
| 4.271°S, 152.203°E
| Elevation 688 m
RVO reported that during 19-25 June gray ash plumes from Rabaul caldera's Tavurvur cone rose 1.5 km above the crater and produced ashfall in Rabaul town (3-5 km NW) and surrounding areas. Incandescence from the summit crater was seen at night. Based on analysis of satellite imagery, the Darwin VAAC reported that during 26-28 June ash plumes rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted 35-75 km NW and W.
Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Rabaul Volcano Observatory (RVO)
| United States
| 60.485°N, 152.742°W
| Elevation 3108 m
AVO reported that during 24-29 June seismicity from Redoubt was low, but remained above background levels. Web camera images showed continued steaming from the lava dome at the summit. No ash signals were observed in radar or satellite imagery. Occasional observations, the low level of seismicity, and low gas emissions suggested that the growth of the lava dome had significantly slowed. On 30 June, AVO lowered the Volcanic Alert Level to Advisory and the Aviation Color Code to Yellow.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
| 2.005°S, 78.341°W
| Elevation 5286 m
Based on a pilot observation, the Washington VAAC reported that on 26 June an ash plume from Sangay rose to an altitude of 7.6 km (25,000 ft) a.s.l. The suspected ash was seen on satellite imagery drifting less than 30 km W.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| 14.757°N, 91.552°W
| Elevation 3745 m
INSIVUMEH reported that on 26 and 29 June explosions from Santa María's Santiaguito lava dome complex produced ash plumes that rose to altitudes of 2.9-3.3 km (9,500-10,800 ft) a.s.l. and drifted W and SW. Fumarolic plumes rose 100-200 m above Caliente dome. On 26 June, the seismic network detected a lahar that traveled S down the Nima I river. Steam plumes and a sulfur odor rose from the deposits. The lahar was 15 m wide and 1 m thick at the toe, and carried blocks up to 1.5 m in diameter.
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 during 19-26 June seismic activity from Shiveluch was above background levels. Based on interpretations of seismic data, steam-and-gas plumes with some ash content were emitted during the reporting period; ash plumes possibly rose to an altitude of 6.8 km (20,000 ft) a.s.l. On 20 June, ash plumes seen on a video camera rose to an altitude of 5 km (16,400 ft) a.s.l. Gas-and-steam activity was observed at other times during the reporting period. Analysis of satellite imagery revealed a daily thermal anomaly over the lava dome. Ash plumes were also seen on satellite imagery drifting 114 km S during 20 and 22-24 June and more than 100 km SW and NE on 25 June. A pyroclastic flow occurred on 25 June. The Level of Concern Color Code remained at Orange. Based on analysis of satellite imagery and information from KEMSD, the Tokyo VAAC reported that during 27-28 and 30 June eruptions produced plumes that rose to altitudes of 4.9-7 km (16,000-23,000 ft) a.s.l.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
| Central Java (Indonesia)
| 7.242°S, 109.208°E
| Elevation 3428 m
CVGHM reported that during 8-28 June tephra was ejected 50-700 m above Slamet's crater and incandescent material was ejected 50-300 m above the crater. Booming noises were reported. During 23-29 June, incandescence and ash emissions were not observed. On 29 June, CVGHM lowered the Alert Level for Slamet to 2 (on a scale of 1-4) because of decreased seismicity and emissions.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
| 16.72°N, 62.18°W
| Elevation 915 m
MVO reported that during 19-26 June activity from the Soufrière Hills lava dome was at a low level. On 20 June, a small pyroclastic flow that traveled E down the Tar River valley produced a small ash cloud that drifted W. The Hazard Level remained at 3.
Source: Montserrat Volcano Observatory (MVO)
| 1.467°S, 78.442°W
| Elevation 5023 m
The IG reported that tremor and explosions from Tungurahua were detected by the seismic network almost daily during 23-30 June. A plume with low ash content rose to an altitude of 7 km (23,000 ft) a.s.l. on 23 June and drifted W, and a small ash plume rose 200 m above the crater on 29 June. Cloud cover frequently prevented observations during the rest of the reporting period. Ashfall was occasionally reported in areas to the W and SW. Sounds resembling blocks rolling down the flanks and "cannon shot" noises were sometimes reported. On 23 June, lava fountains at the summit were observed and blocks ejected from the crater rolled as far as 1 km down the flanks. On 27 June, the seismic network possibly detected lahars in area drainages.
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.
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.
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