Activity for the week of 20 December-26 December 2000
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
| Eastern Java (Indonesia)
| 7.942°S, 112.95°E
| Elevation 2329 m
The VSI reported that during 12-18 December explosion and tremor activity at the volcano increased in comparison to the previous week. Minor explosions sent ash to 500-600 m above the crater rim. In addition, continuous tremor and a large number of explosion earthquakes (2,375) were recorded. The volcano remained at Alert Level 2 (ranging from 1 to 4). Tengger caldera has been active for approximately one month; therefore any further Tengger activity will be reported in the "Continuous Activity" section.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
| Sicily (Italy)
| 37.748°N, 14.999°E
| Elevation 3295 m
Volcanic activity at Etna was low during December, with low gas emission at the SE Crater throughout the month and a few isolated Strombolian events at the Bocca Nuova crater in mid-December.
Sources: Sezione di Catania - Osservatorio Etneo (INGV), Italy's Volcanoes
| Siau Island (Indonesia)
| 2.781°N, 125.407°E
| Elevation 1797 m
The VSI reported that during 12-18 December, activity increased at Karangetang in comparison to the previous week. A thin plume continued to be emitted from the main crater and Crater II, but it rose higher than last week: up to 150 m above the summit. A "red flame," possibly indicating illumination of the plume by lava fountaining or incandescent material at the summit, was observed rising up to 75 m above the summit. Overall seismic activity decreased in comparison to the previous week. The volcano remained at Alert Level 2 (ranging from 1 to 4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
KVERT reported that seismic activity was at background levels at Karymsky until 0905 to 0915 on 20 December when shallow earthquakes registered under the volcano were accompanied by short-lived explosions. At 2150 the same day, a pilot confirmed the presence of ash at the summit of the volcano and mud traces from melting snow on the edifice slopes. On 21 and 22 December (the end of KVERT's report period) seismicity was above background levels. The Concern Color Code was raised from Green to Yellow.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
During the week surface lava flows continued to flow down Pulama pali, with the lava flow front more than 2 km inland from the sea. Overall, seismic tremor was weak to moderate near Pu`u `O`o and was weak beneath Kilauea caldera. The tiltmeters at Kilauea's summit and along the east rift zone showed flat signals.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| 19.023°N, 98.622°W
| Elevation 5393 m
Volcanic activity at Popocatépetl decreased in comparison to last week. The Washington VAAC reported that during 21 to 25 December there were intermittent emissions of mostly steam. In addition, several small-to-moderate explosive events occurred during the week; at 1555 on 24 December ash was erupted to ~9 km a.s.l. and then blown to the E; at 1045 on 25 December ash was erupted to between 5.5 and 7.6 km a.s.l., blown to the NE, and deposited less than 5 km from the summit; and moderate exhalations occurred at 0111 and 0631 on 27 December that sent ash up to 7.6 and 9.8 km, respectively. On 26 December CENAPRED reported that beginning on 24 December the volcano entered a new phase of activity. Moderate explosions were expected to continue for several days or weeks until the lava dome in the summit crater is destroyed. CENAPRED scientists determined that there was decreased likelihood of a large eruption. Most of the 41,000 residents near the volcano, who were evacuated beginning on 15 December, were permitted to return to their homes. The evacuees were warned to remain alert for further activity. The director of CENAPRED, Robert Quaas, told journalists at a press conference on 26 December that, "The volcano could continue to launch incandescent fragments as far as 5 km and could provoke a moderate rain of cooled fragments as far away as 10 km, because of events related to the destruction of the lava dome." The volcano remained at Alert Level Yellow Phase III, but the restricted area was reduced from 13 to 12 km. For more information about the present state of the volcano and the return of evacuees to their homes refer to CENAPRED's 26 December Bulletin.
Sources: Associated Press, Centro Nacional de Prevencion de Desastres (CENAPRED), Notimex, Reuters, Washington Volcanic Ash Advisory Center (VAAC)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
KVERT reported that much like the previous week, the character of the volcanic activity did not change during 15-22 December. On 15 and 20 December weak seismicity was registered at the volcano and at 2105 on 15 December a seismic event was likely accompanied by a gas-and-ash explosion that sent a cloud to an inferred height of 2 km a.s.l. On 20 December a gas-and-steam plume rose 200-300 m above the crater. KVERT lowered the Concern Color Code from Yellow to Green.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 16.72°N, 62.18°W
| Elevation 915 m
The Washington VAAC reported that throughout the week low-level (up to ~2 km) ash clouds that were produced by rockfalls, and periodic hot spot activity were visible on GOES-8 imagery.
Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
| 1.467°S, 78.442°W
| Elevation 5023 m
The IG reported that on 21 December an ash cloud was observed over the summit of Tungurahua at a height of ~5.8 km a.s.l. According to the Washington VAAC, the ash was not visible on GOES-8 imagery.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)
Weekly Reports Archive
||Huila, Nevado del
||Hunga Tonga-Hunga Ha'apai
||Soufriere St. Vincent
||South Sarigan Seamount
||Tair, Jebel at
|Campi Flegrei del Mar di Sicilia
|Chillan, Nevados de
||Palena Volcanic Group
||Kick 'em Jenny
|Dieng Volcanic Complex
||Rincon de la Vieja
|Etorofu-Yakeyama [Grozny Group]
||Lengai, Ol Doinyo
||Ruiz, Nevado del
|Fournaise, Piton de la
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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:
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An RSS (Really Simple Syndication) feed for the Weekly Volcanic Activity Report first made available on 5 March 2008 can be utilized with the aid of various free downloadable readers. The report content of the news feed is identical to the Weekly Volcanic Activity Report minus some features including the header information (latitude and longitude and summit elevation), the Geologic Summary, and a link to the volcano's page from the Global Volcanism Program. Each volcano report includes a link from the volcano's name back to the more complete information in the Weekly Volcanic Activity Report on the Smithsonian website. On 12 March 2009, GeoRSS tags were added so that the latitude and longitude for each volcano could be included with the feed.
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