Activity for the week of 3 September-9 September 2003
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
| Costa Rica
| 10.463°N, 84.703°W
| Elevation 1670 m
A sequence of pyroclastic flows began at Arenal on 5 September at 1055. Seismographs recorded eight signals within 2 hours after the activity began. Lava flows descended to 800 m down the volcano's N and NE flanks. Ash drifted towards the W and NW. No injuries or deaths were reported and the main effects were limited to the National Park boundaries.
Sources: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA), Associated Press, Reuters
| 19.514°N, 103.62°W
| Elevation 3850 m
Based on information from the Mexico City MWO, the Washington VAAC reported that on 6 September at 1026 a strong ash emission occurred at Colima. The resultant ash cloud rose to ~6.7 km a.s.l. and drifted N. Ash was not visible on satellite imagery. Another ash emission occurred on 8 September that was visible on the Colima video camera.
Source: Washington 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 29 August to 5 September. On 28 and 29 August ~120 shallow earthquakes occurred per day, and ash explosions rose to ~4.7 km a.s.l. The number of shallow earthquakes increased to 180 on 1 September, and then to 230 on 2-3 September. Seismic data indicated that ash-and-gas explosions reached 4.5 km a.s.l. On 30 August spasmodic tremor and a thermal anomaly visible on satellite imagery indicated the formation of a pyroclastic flow. The Concern Color Code at Karymsky was reduced from Orange to Yellow.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
During 4-9 September, surface lava flows were sometimes visible on the coastal flat and in areas upslope. Generally, seismicity at Kilauea's summit continued at moderate levels, with 1-2 small low-frequency earthquakes per minute occurring at shallow depths beneath the summit caldera. There were some larger events at depths of a few kilometers. Small inflation and deflation occurred during the report week.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| Central Kamchatka (Russia)
| 56.056°N, 160.642°E
| Elevation 4754 m
During 29 August to 5 September, seismicity was above background levels at Kliuchevskoi, with 4-7 earthquakes less than M 2.2 occurring per day. at depths around 30 km On 29 August gas-and-steam plumes with minor amounts of ash rose to 1 km above the crater. On the evening of 4 September incandescence was visible in the center of the crater. Kliuchevskoi remained at Concern Color Code Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Eastern Java (Indonesia)
| 8.108°S, 112.922°E
| Elevation 3657 m
An ash plume emitted from Semeru on 9 September rose to ~7.3 km a.s.l. and drifted S. Ash was not visible on satellite imagery.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Sulawesi (Indonesia)
| 1.112°N, 124.737°E
| Elevation 1785 m
An ash emission from Soputan on 4 September produced a cloud that rose to ~3 km a.s.l., extended ~75 km N of the summit, and was visible on satellite imagery. Soputan was at Alert Level 2 (on a scale of 1-4).
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| 16.72°N, 62.18°W
| Elevation 915 m
Activity at Soufrière Hills remained at low levels during 29 August to 5 September. No growth occurred at the new lava dome. During the later part of the week gas emission rates could not be measured because the plume was blown out of reach of the spectrometer in unusual wind directions caused by Hurricane Fabian.
Source: Montserrat Volcano Observatory (MVO)
| 1.467°S, 78.442°W
| Elevation 5023 m
Ash emissions continued at Tungurahua during 3-8 September. Ashfall occurred in the town of Pillate on 3 and 4 September and in the town of Mocha on 4 September. During the evening of 7 September incandescence was visible in the crater.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)
Weekly Reports Archive
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||Hunga Tonga-Hunga Ha'apai
||Soufriere St. Vincent
||South Sarigan Seamount
||Dieng Volcanic Complex
|Antillanca Volcanic Complex
||Tair, Jebel at
||Maule, Laguna del
||Rincon de la Vieja
||Etorofu-Yakeyama [Grozny Group]
||Fournaise, Piton de la
||Ruiz, Nevado del
||Kick 'em Jenny
|Campi Flegrei del Mar di Sicilia
|Chillan, Nevados de
||Lengai, Ol Doinyo
||Huila, Nevado del
News Feeds and Google Placemarks
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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.
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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