An ash emission on 28 September at 0802 from Santa María's Santiaguito lava-dome complex was visible on satellite imagery. Ash rose to ~4.3 km a.s.l., but was no longer visible by 1545.
According to a report from aircraft personnel, on 24 September ash was visible rising to ~900 m above Lamongan. Ash was not visible on satellite imagery.
Seismicity was above background levels at Kliuchevskoi during 19-26 September, with 1-3 earthquakes (M 1.7-2.2) at depths around 30 km. A gas-and-steam plume rose to ~700 m above the crater on 24 September. Kliuchevskoi remained at Concern Color Code Orange.
During 24-30 September, surface lava flows were sometimes visible on Kilauea's coastal flat and upslope areas. 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 earthquakes at depths of a few kilometers.
Ash plumes emitted from Fuego were visible on satellite imagery on 28 September. The first emission occurred around 0500 and produced an ash plume that covered an area of 5 x 5 km and drifted S. It was no longer visible by 0800.
On 25 September an ash-and-steam plume was recorded by the Etna video camera reaching a height less than 4.5 km a.s.l. and drifting W.
During 24-26 September, faint ash plumes from Dukono were visible on satellite imagery rising to ~3 km a.s.l. and extending to a maximum distance of 80 km.
An ash plume from Ulawun was visible on satellite imagery on 22 September at a height of ~3.7 km a.s.l. The plume extended toward the NW.
Wed, 17 Sep 2003, 06:00
According to the National Weather Service, strong winds on 21 September in the Katmai area picked up old, loose volcanic ash and carried it E over Kodiak Island. AVO received reports that some of this material fell in Kodiak. This was not the result of volcanic activity and no eruption occurred.
Read allWed, 17 Sep 2003, 06:00
Moderate-to-large ash emissions continued at Tungurahua during 19-26 September. A period of relatively high activity at Tungurahua during 9 September to at least 26 September consisted of nearly permanent tremor related to gas discharge, and strong ash emissions. On 22 September ash clouds reached a height of 3 km above the volcano and drifted W.
Read allWed, 17 Sep 2003, 06:00
Volcanic activity at Soufrière Hills remained at low levels during 5-12 September. No new lava-dome growth occurred, although there were several ash-venting episodes that were accompanied by a few small earthquakes. Sulfur-dioxide emission rates were relatively low during the report week.
Read allWed, 17 Sep 2003, 06:00
During 17-23 September, moderate emissions of mainly gas, steam, and sometimes ash occurred at Popocatépetl. According to the Washington VAAC, on 21 September a small possible ash cloud was visible on satellite imagery at a height of ~7 km a.s.l., extending NW from the summit. The cloud dissipated rapidly.
Read allWed, 17 Sep 2003, 06:00
During 14 August to 18 September, seismicity at Mayon remained within background levels (less than five earthquakes/day). No volcanic earthquakes were recorded after 14 September. Moderate volcanic-gas emissions were observed during most of the report period.
Read allWed, 17 Sep 2003, 06:00
Seismicity was above background levels at Kliuchevskoi during 12-19 September, with 2-6 earthquakes between M 1.7 and 2.2 occurring. Ash-and-gas plumes rose to 100 m above the crater and drifted W. The volcano's western flank was covered by fresh ash.
Read allWed, 17 Sep 2003, 06:00
During 17-23 September, surface lava flows were sometimes visible on Kilauea's coastal flat and upslope areas. Surface lava flows were about 800 m inland of the coast on 21 September. 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.
Read allWed, 17 Sep 2003, 06:00
Seismicity was above background levels at Karymsky during 12-19 September, with 210-300 shallow earthquakes occurring per day. These data indicated that possible ash-and-gas explosions occurred and rose 1-1.5 km above the crater. On 14 September an ash-and-gas plume rose .5 km above the crater.
Read allWed, 10 Sep 2003, 06:00
Moderate-sized ash emissions continued at Tungurahua during 10-15 September. On 15 September two emissions produced gas-and-ash plumes that reached a maximum height of 2 km above the volcano. Ash fell predominately W of the volcano, including in the towns of Juive, Pillate, and western Baños.
Read allWed, 10 Sep 2003, 06:00
Volcanic activity at Soufrière Hills remained at low levels during 5-12 September. No new lava-dome growth occurred, although there were several ash-venting episodes that were accompanied by a few small earthquakes. Sulfur-dioxide emission rates were relatively low during the report week.
Read allWed, 10 Sep 2003, 06:00
According to a report from aircraft personnel, on 12 September at 1510 an ash plume emitted from Lokon-Empung rose to a height of ~7.6 km a.s.l. and drifted W. The plume was not visible on satellite imagery.
Read allWed, 10 Sep 2003, 06:00
Seismicity was above background levels at Kliuchevskoi during 5-12 September, when 2-9 earthquakes with magnitudes less than 2.1 occurred per day at depths of ~30 km. During the week, ash-and-gas, and gas-and-steam plumes were seen. The highest rising ash-and-gas plume reached ~1.5 km above the volcano on 10 September.
Read allWed, 10 Sep 2003, 06:00
During 10-16 September, surface lava flows were sometimes visible on Kilauea's coastal flat and upslope areas. 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 earthquakes at depths of a few kilometers.
Read allWed, 10 Sep 2003, 06:00
Volcanic activity remained at low levels at Etna's summit craters. Abundant SO2 and steam emissions occurred at Northeast and Bocca Nuova craters. An M 3.3 earthquake occurred near Etna beneath the Ionian Sea.
Read allWed, 10 Sep 2003, 06:00
Ash plumes from Dukono were visible on satellite imagery on 11 and 16 September, extending NE of the summit ~40 and 80 km, respectively.
Read allWed, 10 Sep 2003, 06:00
During a flight over Anatahan during the week of 7 September, USGS and Emergency Management Office (EMO) personnel did not see any ash emissions, only low-level steam-and-gas emissions. The floor of Anatahan's crater was covered by sediment-laden water. In East Crater there was an active geothermal system, consisting of mud pots, mini-geysers, and steam jetting from the crater walls.
Read allWed, 3 Sep 2003, 06:00
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.
Read allWed, 3 Sep 2003, 06:00
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.
Read allWed, 3 Sep 2003, 06:00
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.
Read allWed, 3 Sep 2003, 06:00
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).
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