During 13-20 December, seismicity remained above background levels at Shiveluch. Seismic data indicated that seven ash-and-gas explosions reached heights of 1-2 km above the lava dome, and hot avalanches possibly occurred. A number of smaller earthquakes at depths of 0-6 km and weak intermittent spasmodic tremor was recorded.
During 18-23 December, volcanic and seismic activity were low at Reventador. Seismicity was characterized by low-frequency tremor. No new activity was recorded at the volcano.
During 17-20 December, the eruption of Rabaul volcano's Tavurvur cone was characterized by slow, convoluted ash plumes that rose several hundred to more than a thousand meters above the summit. Seismicity was low to moderate and no significant ground deformation was recorded.
Moderate explosions occurred at Popocatépetl on 18 December. After a period of high-frequency tremor, an explosion occurred at 0148 that produced an ash cloud that reached 2 km above the crater. Later, at 0209 and 0214 two explosions sent ash to ~0.5 km above the crater. that drifted to the NE.
OVPDLF reported on 19 December that after effusive activity stopped on 3 December very strong seismicity was recorded with more than 1,000 earthquakes occurring per day. The earthquakes were located a few hundred meters below Dolomieu crater. OVPDLF stated that crater collapse is possible.
Seismicity was above background levels at Kliuchevskoi during 13-20 December. Seismographs recorded 6-12 earthquakes per day during the report period at depths of ~ 30 km. In addition, intermittent spasmodic volcanic tremor was recorded.
During 18-22 December, lava continued to enter the sea at several points along the coast at three lava deltas. Surface lava flows were visible along the E arm that feeds a new lava delta, and sporadically along Paliuli. Generally, seismicity was at normal levels.
Seismicity remained above background levels at Karymsky during 13-20 December, with about 190-210 shallow events recorded per day. The character of seismicity indicated that ash-and-gas explosions reached heights of ~1 km above the volcano, and vigorous, 5- to 10-minute-long gas emissions possibly occurred. Karymsky remained at Concern Color Code Yellow.
Wed, 18 Dec 2002, 06:00
Eruptive activity continued during 16-21 December at Etna. According to the Italy's Volcanoes website, during the evening of 16-17 December explosive activity changed from lava-and-ash fountaining to discrete, ash-poor Strombolian explosions. Lava continued to flow from two vents at the S base of the active pyroclastic cone at 2,750-m elevation.
Read allWed, 11 Dec 2002, 06:00
During 11 December, emissions of steam, gas, and ash continued at Tungurahua. Plumes rose to ~1 km above the volcano.
Read allWed, 11 Dec 2002, 06:00
Reports of activity at Soufrière Hills covered the interval 6-13 December. Activity increased during the first 3 days of this interval, peaking in a dome-collapse event on the night of 8 December. Following this event, activity returned to moderate levels for the remainder of the week.
Read allWed, 11 Dec 2002, 06:00
During 6-13 December, seismicity remained above background levels at Shiveluch, but it decreased after 8 December. Seismic data indicated that eight ash-and-gas explosions reached heights of 1-2 km above the lava dome, and hot avalanches possibly occurred. A number of smaller earthquakes at depths of 0-6 km and weak intermittent spasmodic tremor was recorded.
Read allWed, 11 Dec 2002, 06:00
Based on ground observations from Chinandega, the Washington VAAC reported that relatively strong volcanic activity occurred at San Cristóbal on 16 December at 0745. INETER's volcano camera and satellite imagery showed a plume emanating from the summit that appeared to be mainly composed of steam with some possible ash.
Read allWed, 11 Dec 2002, 06:00
During 12-15 December, volcanic and seismic activity was low at Reventador; however, weather clouds thwarted visual observations.
Read allWed, 11 Dec 2002, 06:00
During 12-16 December, the eruption of Rabaul volcano's Tavurvur cone was characterized by slow, convoluted ash plumes that rose several hundred meters above the summit. Moderate amounts of ashfall affected areas close to the cone. Seismicity was low to moderate and no significant ground deformation was recorded.
Read allWed, 11 Dec 2002, 06:00
During December there were several emissions of steam, gas, and minor amounts of ash at Popocatépetl. According to CENAPRED, new episodes of low-frequency tremor, beginning on 19 November, signaled the growth of a new lava dome within Popocatépetl's crater. Aerial photographs obtained by the Mexican Ministry of Communications and Transportation on 2 December confirmed the presence of a fresh lava dome measuring about 180 m in diameter at its base, and about 52 m high.
Read allWed, 11 Dec 2002, 06:00
During 2-8 December, ash plumes continually emitted from Papandayan's Baru crater rose 150-400 m above the rim and drifted NE. Explosions occurred on 4 December at 0700 and on 8 December at 1758. The number of shallow volcanic earthquakes decreased during the report week, while deep volcanic and tectonic earthquakes increased in comparison to the previous week.
Read allWed, 11 Dec 2002, 06:00
Seismicity was above background levels at Kliuchevskoi during 6-13 December. Seismographs recorded 12-24 earthquakes per day during the report period at depths of ~ 30 km. In addition, intermittent spasmodic volcanic tremor was recorded.
Read allWed, 11 Dec 2002, 06:00
During 10-17 December, lava continued to enter the sea at several points along the coast. On 15 December, shortly after 0700, the Wilipe'a lava delta partially collapsed, losing about 1/3 of its area. The tip of the delta retreated shoreward about 260 m and most of the collapse was in the central part of the delta.
Read allWed, 11 Dec 2002, 06:00
Seismicity remained above background levels at Karymsky during 6-13 December, with about 210-230 shallow events recorded per day. The character of seismicity indicated that ash-and-gas explosions reached heights of ~1 km above the volcano, and vigorous, 5- to 10-minute-long gas emissions possibly occurred. Karymsky remained at Concern Color Code Yellow.
Read allWed, 11 Dec 2002, 06:00
According to an INGV-CT report, the eruption that began at Etna on 27 October continued through 13 December. On 8 December there was a sudden change in eruptive style. Strong Strombolian explosions from the 2,800-m vent replaced previous fire fountaining, signaling the end of ash emissions for about 24 hours.
Read allWed, 4 Dec 2002, 06:00
An aerial inspection of Pago on 10 December confirmed that lava continued to slowly flow from the volcano. The lava flow remained confined by the walls of Witori caldera. Variable amounts of steam was emitted from vents.
Read allWed, 4 Dec 2002, 06:00
Lava emissions from Piton de la Fournaise that had begun on 16 November ended on 3 December. Permanent tremor decreased significantly that day, although seismic events beneath the summit continued at a rate of one a minute. Sesimicity continued to decline over the next 2 days.
Read allWed, 4 Dec 2002, 06:00
According to the Italy's Volcanoes website, as of 5 December explosive activity continued at one of Etna's vents in the northernmost portion of the fissure that opened on Etna's upper S flank on 27 October. Ash emission and lava fountaining were vigorous, with continuous tephra fall affecting areas NE and E of Etna during several days before 5 December. Lava emission seemed to temporarily cease after about 3 weeks of near-continuous activity from vents on the flanks of the new pyroclastic-cone complex.
Read allWed, 4 Dec 2002, 06:00
During 4-9 December, emissions of steam, gas, and ash continued at Tungurahua. The highest reported ash cloud was produced from an eruption on 4 December at 1215. It reached a height of 3.5 km above the volcano and drifted NW.
Read allWed, 4 Dec 2002, 06:00
Activity at Soufrière Hills during 29 November to 6 December remained at moderate levels. Growth of the active lava dome in the N part of the dome complex continued. A number of small, short-lived spines formed at the base of this lobe, shedding material E into White's Ghaut and the Tar River Valley.
Read allWed, 4 Dec 2002, 06:00
Seismicity remained above background levels at Shiveluch, but decreased during 29 November to 6 December. Seismic data indicated that nine ash-and-gas explosions reached heights of 1-2 km above the lava dome, and hot avalanches possibly occurred. A number of smaller earthquakes at depths of 0-6 km were recorded.
Read allWed, 4 Dec 2002, 06:00
IGNS reported on 12 December that during the previous 2 months volcanic tremor and earthquakes had been occurring at Ruapehu, but there had been little surface change. However, during 5-12 December the temperature of Crater Lake rose 11°C, to 35°C. Ruapehu remained at Alert Level 1 (signs of volcano unrest).
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