According to news articles, increased volcanic activity at Egon on 31 August led people from at least seven villages near the volcano to temporarily evacuate their homes. Local officials feared that about 2,000 people living on the mountainside were at risk. Reportedly, activity decreased after a few hours and most villagers returned home.
Based on information from JMA, the Tokyo VAAC reported that an eruption beginning at Asama around 2000 on 1 September produced an ash plume to an unknown height. Ash was not visible on satellite imagery. According to news articles, JMA raised the Alert Level from 2 to 3 and advised people not to visit the volcano.
During 25-31 August, volcanic and seismic activity were at low-to-moderate levels at Tungurahua. Emissions of gas, steam, and ash rose to low levels above the volcano and were accompanied by tremor. In addition, several long-period earthquakes occurred during the report period.
Seismic and volcanic activity at Soufrière Hills remained at low levels during 20-27 August. The seismic network recorded one hybrid earthquake and one rockfall. Sulfur-dioxide flux ranged between 175 and 310 metric tons per day.
On 25 August, a thin plume emitted from Semeru was visible on satellite imagery extending WSW. No ash was visible on the satellite imagery.
During 30 August to 1 September, several weak-to-moderate explosions at Santa Maria's Santiaguito lava-dome complex produced ash clouds to a maximum height of ~1 km above the volcano. Avalanches of lava blocks and ash traveled down the S flank of Caliente dome.
According to the Société Volcanologique Européenne website, the eruption that began at Piton de la Founaise on 13 August continued through 31 August. The main lava flow entered the sea, building a large lava bench.
During 25-31 August, surface lava flows were visible at Kilauea on the Pulama pali fault scarp, and all vents in the crater of Pu`u `O`o were incandescent. Seismicity was weak beneath Kilauea's summit. There was no tremor beneath Kilauea, and it was at moderate levels at Pu`u `O`o'.
Wed, 25 Aug 2004, 06:00
INGEOMINAS reported that at Galeras during 19 August to 1 September, there was a decrease in the level of seismicity and the number of ash emissions. Gas-and-steam emissions continued.
Read allWed, 25 Aug 2004, 06:00
During 30 August to 1 September, several small explosions at Fuego produced plumes to low levels.
Read allWed, 25 Aug 2004, 06:00
On 1 September, a thin ash plume emitted from Dukono was visible on satellite imagery at a height of ~3 km a.s.l. drifting NW.
Read allWed, 25 Aug 2004, 06:00
On 30 August, low-level activity continued at Colima with an average of less than three ash-containing explosions per day. The resultant plumes did not rise higher than 2 km above the crater and predominately drifted W.
Read allWed, 18 Aug 2004, 06:00
Episodes of volcanic tremor continued intermittently at Veniaminof during 13-20 August. Occasional small ash-and-steam emissions occurred during the report week that were similar to those observed over the previous 2 months. None rose above 3 km a.s.l.
Read allWed, 18 Aug 2004, 06:00
According to the Darwin VAAC, a thin ash plume emitted from Ulawun on 23 August rose ~3 km above the volcano and drifted SW.
Read allWed, 18 Aug 2004, 06:00
Volcanic and seismic activity at Tungurahua remained at low levels during 18-23 August. Emissions of gas, steam, and ash rose to low levels above the volcano and a small number of long-period earthquakes occurred.
Read allWed, 18 Aug 2004, 06:00
Due to a decrease in seismic and volcanic activity at Tengger Caldera, DVGHM decreased the Alert Level from 2 to 1 on 16 August. They warned that gas emissions could still be dangerous to visitors and recommended that people do not enter a 1 km radius zone around the volcano.
Read allWed, 18 Aug 2004, 06:00
Elevated levels of seismicity continued to be recorded at Spurr during 13-20 August. Seismicity reached a maximum of 70 earthquakes on 14 August, then declined to about 15 earthquakes per day the rest of the week. This was slightly higher than the level recorded during the previous weeks.
Read allWed, 18 Aug 2004, 06:00
Volcanic and seismic activity at Soufrière Hills remained at low levels during 13-20 August. The seismic network recorded one hybrid earthquake, one volcano-tectonic earthquake, and one rockfall. Sulfur-dioxide flux measurements were generally around 200 metric tons per day.
Read allWed, 18 Aug 2004, 06:00
Seismicity was above background levels at Shiveluch during 13-20 August, with weak earthquakes 0-5 km beneath the active lava dome. Gas-and-steam plumes rose ~3 km a.s.l. Shiveluch remained at Concern Color Code Concern Color Code Orange.
Read allWed, 18 Aug 2004, 06:00
On 24 August a thin plume emitted from Semeru was visible on satellite imagery extending to the WSW.
Read allWed, 18 Aug 2004, 06:00
During 18-23 August several explosions occured at Santa María's Santiaguito lava-dome complex, producing ash plumes to ~1.3 km above the volcano. Two partial lava dome collapses on 23 August produced pyroclastic flows to the SE.
Read allWed, 18 Aug 2004, 06:00
Based on a news article, Société Volcanologique Européenne reported that the eruption that began at Piton de la Fournaise on 13 August continued through 20 August. Lava flowed N of Piton Madore.
Read allWed, 18 Aug 2004, 06:00
During 21-24 August, surface lava flows were visible at Kilauea on the Pulama pali fault scap and all vents in the crater of Pu`u `O`o were incandescent. Seismicity was weak beneath Kilauea's summit. There was no tremor beneath Kilauea and it was at moderate levels at Pu`u `O`o'.
Read allWed, 18 Aug 2004, 06:00
INGEOMINAS reported that gas-and-ash emissions continued at Galeras as of 18 August. Ash fell in villages near the volcano, including La Florida, Sandoná, El Ingenio (within 15 km of the volcano), and farther afield in Samaniego and Sotomayor (between 20 and 40 km from the volcano).
Read allWed, 18 Aug 2004, 06:00
During 18-23 August, many weak-to-moderate explosions occurred at Fuego. The explosions expelled lava blocks to ~100 m above the crater and plumes rose to a maximum height of 0.5 km above the crater. Avalanches of incandescent volcanic material traveled to the mouths of several ravines on the volcano's flanks.
Read allWed, 11 Aug 2004, 06:00
During 6-13 August, frequent small ash-and-steam emissions from Veniaminof were visible on the web camera in Perryville and confirmed by AVO geologists working in the area. The emissions did not exceed a height of 3 km a.s.l. and were similar to those commonly observed in the past 2 months.
Read allWed, 11 Aug 2004, 06:00
An eruption began at Piton de la Fournaise on 13 August after an increase in seismicity during 9-11 August. On the 13th, fissures that opened on the upper part of the Dolomieu crater emitted 2- to 3-km-long lava flows that traveled toward the sea.
Read allWed, 11 Aug 2004, 06:00
INGEOMINAS reported that volcanic and seismic activity increased at Galeras on 11 August at 2349 when an eruption began that sentan ash-and-gas cloud to an unknown height and generated visible incandescence. According to the Washington VAAC, satellite imagery showed that an ash plume rose to a height of ~10.7 km a.s.l. It spread in all directions, but mainly to the NE, E, and SW.
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