KVERT raised the Concern Color Code at Alaid from Green to Yellow on 4 November.
Volcanic activity at Soufrière Hills during 24-31 October remained at low levels. No morphological changes were seen at the volcano's summit and no new lava was observed in the vent area. According to the Washington VAAC, on 1 November a low-level plume of re-suspended ash was visible on satellite imagery.
During October, ash explosions at Semeru continued to produce low-level plumes and seismicity was dominated by hundreds of explosion earthquakes. Semeru remained at Alert Level 2 (on a scale of 1-4).
INSIVUMEH reported that on 30 October three small collapses occurred at Santa María's crater edge. Moderate-to-weak explosions occurred and dozens of 2- to 3-minute long avalanches deposited material on the volcano's S flank. According to the Washingon VAAC, on 31 October low-level ash plumes from Santa María were visible on satellite imagery.
A decrease in volcanic activity at Lewotobi during 13-19 October led DVGHM to decrease the Alert Level from 2 to 1 (on a scale of 1-4). Only gas was emitted to low levels and no volcanic earthquakes were recorded.
Seismicity was above background levels at Kliuchevskoi during 24-31 October, with one to five earthquakes (M 1.6-2.3) occurring per day at depths around 30 km. Several large shallow earthquakes (M 1.7-2.6), and weaker earthquakes occurred. Gas plumes rose to ~700 m above the volcano.
During 29 October to 3 November, areas of surface lava were visible upslope of Kilauea's coastal flat. Seismicity at Kilauea's summit continued at moderate levels, with one to two small low-frequency earthquakes per minute occurring at shallow depths beneath the summit caldera. There were some larger earthquakes at depths of a few kilometers.
Seismicity was above background levels at Karymsky during 24-31 October, although the number of shallow earthquakes decreased from 250 to 70 per day. Seismic data indicated that possible ash-and-gas explosions rose 1-2.5 km above the crater. Satellite imagery showed a possible plume extending ~65 km NNE.
Wed, 29 Oct 2003, 06:00
Volcanic activity decreased at Gamalama during 6-12 October, leading DVGHM to reduce the Alert Level from 2 to 1 (on a scale of 1-4) on 13 October. During the report period, gas emissions rose to ~50 m above the summit and the number of daily earthquakes decreased to normal levels.
Read allWed, 29 Oct 2003, 06:00
According to DVGHM, ash explosions at Dukono during October produced low-level plumes. Ash fell around the Tobelo area ~15 km E of the volcano. Dukono was at Alert Level 2 (on a scale of 1-4).
Read allWed, 29 Oct 2003, 06:00
On 30 October two small eruptions occurred at Colima that consisted of mostly steam and some ash. The plumes rose to about 7.3 km a.s.l. and mainly drifted W.
Read allWed, 22 Oct 2003, 06:00
During 21-27 October, moderate-sized eruptions continued at Tungurahua. Ash plumes generally rose to ~2 km above the volcano. An emission on 26 October deposited ash in the town of Baños N of the volcano.
Read allWed, 22 Oct 2003, 06:00
Volcanic activity at Soufrière Hills remained at low levels during 17-24 October. The lava dome was visible on 23 October when a volume survey was carried out. The small lava dome that extruded in July had not grown further, appearing to be stagnant with alteration and degradation causing it to break apart.
Read allWed, 22 Oct 2003, 06:00
INSIVUMEH reported that as of 24 October at Santa María's Santiaguito lava dome several moderate explosions occurred and block-and-ash avalanches traveled down the volcano's S flank. The ash from the avalanches mainly drifted SW. According to the Washington VAAC, on 26 October a pilot saw a small eruption at Santa María and satellite imagery showed a narrow plume extending ~20 km W.
Read allWed, 22 Oct 2003, 06:00
During October, moderate emissions of mainly gas and steam occurred at Popocatépetl. Aerial photographs taken on 17 October showed that the inner crater had subsided and that no external lava dome was visible at the bottom of the crater.
Read allWed, 22 Oct 2003, 06:00
Seismicity was above background levels at Kliuchevskoi during 17-24 October, with one to five M 1.7-2.1 earthquakes occurring per day at depths around 30 km. Four larger (M 2.1-2.5) earthquakes occurred, as well as a large number of weak shallow ones. Gas-and steam plumes were emitted during the week.
Read allWed, 22 Oct 2003, 06:00
During 22-28 October, areas of surface lava were visible upslope of Kilauea's coastal flat. Seismicity at Kilauea's summit continued at moderate levels, with one to two small low-frequency earthquakes per minute occurring at shallow depths beneath the summit caldera. There were some larger earthquakes at depths of a few kilometers.
Read allWed, 22 Oct 2003, 06:00
Satellite imagery showed an ash plume emitted from Dukono that rose to ~3 km a.s.l. and extended ~230 km NE.
Read allWed, 15 Oct 2003, 06:00
During 15-19 October activity at Tungurahua remained high, with moderate-to-slight gas-and-ash emissions sending columns on average to 1.5 km above the crater. On the night of 18 October incandescent blocks were observed rolling down the W side of the crater. Incandescence and Strombolian activity were observed on the night of 19 October.
Read allWed, 15 Oct 2003, 06:00
According to news reports, the continuing unrest at Mayon led authorities to extend the 6-km-radius Permanent Danger Zone to 7 km in the SE quadrant of the volcano on 13 October. Seismicity and SO2 emissions increased during the previous week. During a 24-hour-monitoring period, ending the night of 17 October, 16 volcanic earthquakes were recorded beneath Mayon's lower flanks.
Read allWed, 15 Oct 2003, 06:00
According to news reports, local authorities issued an alert and closed Cereme to the public after detecting unrest. Several earthquakes were recorded on 17 October. Seismicity increased on 18 October, when 18 earthquakes up to M 2 occurred.
Read allWed, 15 Oct 2003, 06:00
Activity at Soufrière Hills during 10-17 October remained at low levels. Seismicity indicated that 12 rockfalls occurred as well as nine hybrid earthquakes. Lahars were also noted during periods of heavy rainfall.
Read allWed, 15 Oct 2003, 06:00
As of 17 October Santa María's Santiaguito lava dome produced moderate explosions accompanied by block-and-ash flows that traveled SSW and NE. On 16 October at 1745 a strong explosion caused a portion of the SW crater to collapse, forming a pyroclastic flow that traveled ~4 km in ~3 minutes.
Read allWed, 15 Oct 2003, 06:00
During 13-19 October at Reventador, 77 volcano-tectonic and 17 long-period earthquakes were recorded, averaging eleven and two earthquakes per day, respectively. Lahars were reported on 13, 14, and 19 October. The lahar on 13 October was the largest of the week, lasting ~75 minutes.
Read allWed, 15 Oct 2003, 06:00
Seismicity was above background levels at Kliuchevskoi during 11-17 October, with one to six magnitude 1.6-2.1 earthquakes per day at depths of ~30 km. Nine shallow M 1.7-2.2 earthquakes were recorded along with many smaller ones. On 9, 10, and 11 October, gas-and-steam plumes with little ash rose to 0.5-1.5 km above the volcano's crater and extended more than 10 km E.
Read allWed, 15 Oct 2003, 06:00
During 15-20 October, a few areas of surface lava were visible upslope of Kilauea's coastal flat. Seismicity at Kilauea's summit continued at moderate levels, with one to two small low-frequency earthquakes per minute occurring at shallow depths beneath the summit caldera. There were some larger earthquakes at depths of a few kilometers.
Read allWed, 15 Oct 2003, 06:00
A 33-minute-long explosive eruption began at Fuego on 17 October at 0007, producing a gas-and-ash plume to ~1.5 km above the crater. This eruption was preceded and followed by small explosions and seismicity. During one of these earthquakes a small incandescent avalanche descended the Santa Teresa ravine.
Read allWed, 15 Oct 2003, 06:00
Satellite imagery showed an ash plume emitted from Dukono on 15 October at 1228. The plume rose to ~3 km a.s.l. and extended ~75 km NNE.
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