On 1 September, a plume from Barren Island was visible on satellite imagery at a height of ~3 km (10,000 ft) a.s.l. extending ~90 km NE of the summit. The current eruption of Barren Island began on 28 May.
A thermal feature at Cleveland was detected on several satellite images obtained on 31 August, but there was no evidence of eruptive activity at the volcano. Cleveland is not seismically monitored, so AVO did not assign it a Concern Color Code.
During 31 August to 6 September, several small explosions occurred at Colima. On 31 August during 1245-1330, a seismic signal associated with a lahar was recorded at the Monte Grande station. The lahar caused no damage.
During 22-28 August, a large number of long-period (LP) and hybrid earthquakes continued to be recorded at Cotopaxi. Increased seismicity was first recorded in late July. Most of the events recorded during the report period were small, and were recorded mainly at stations nearest to the crater.
A plume from Dukono was observed on satellite imagery on 2 September at a height of ~3 km (10,000 ft) a.s.l. extending NW.
Seismicity was above background levels at Karymsky during 26 August to 2 September. Interpretations of seismic data suggested that ash-and-gas plumes may have risen to 4.5 km (14,800 ft) a.s.l. An ash plume was visible at a height of ~5.8 km (19,000 ft) a.s.l. on 27 August.
During 1-5 September, volcanic activity at Tungurahua remained at low levels with small emissions of steam, gas, and variable ash content. On 1 September, ash fell in the Puela sector, ~ 8 km SW of the summit.
During 1-5 September, lava from Kilauea entered the sea at the East Lae`apuki area, and surface lava flows were visible on the Pulama Pali fault scarp. On 27 August, part of a lava bench (land built out from the sea cliff) collapsed. During the report period, background volcanic tremor was around normal levels at Kilauea's summit.
Wed, 31 Aug 2005, 06:00
During 22-28 August, there was a decrease in activity at Reventador in comparison to the previous week. Seismicity and gas emissions decreased at the volcano, and no surficial changes were observed. On 1 September a pilot reported an ash cloud to the Washington VAAC, but no ash was visible on satellite imagery.
Read allWed, 31 Aug 2005, 06:00
During 1-6 September, seismicity and gas emissions were above normal levels at Santa Ana as they had been since 27 July. Tremor continued to be recorded, and on 2 August a cluster of at least eight small earthquakes occurred. The earthquakes were not felt by local residents.
Read allWed, 31 Aug 2005, 06:00
Growth of Shiveluch's lava dome continued during 26 August to 2 September, and viscous lava continued to flow at the lava dome. Several ash plumes reached ~5.5 km (18,050 ft) a.s.l. The volcano remained at Concern Color Code Orange.
Read allWed, 31 Aug 2005, 06:00
Growth of the new lava dome inside the crater of Mount St. Helens continued during 31 August to 6 September, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. Images of the crater showed continued westward motion of the new lava dome.
Read allFri, 26 Aug 2005, 02:46
"Dozens of small earthquakes near a volcano in southwest Colombia were raising concerns Sunday of a possible eruption. More than 30 temblors have occurred within 10 kilometers (6.2 miles) of the Galeras volcano beginning Saturday Aug. 20, geologist Roberto Torres said. Several had a magnitude near 5 and seven were strong enough to be felt by people."
Galeras volcano is an active "4270-m high andesitic stratovolcano in the southwestern Colombia near the border to Ecuador" whose activity in May 2005 prompted the Colombia government to evacuate the area.
Thu, 25 Aug 2005, 14:45
From the GVP/USGS Weekly Volcanic Activity Report 17-23 August 2005:
Read allThu, 25 Aug 2005, 14:39
Activity at Kilauea is at low levels at present and only little lava can be seen: during the past week, the lava entry at the East Lae`Apuki point continued to be active, and a few surface lava flows were sometimes visible on the Pulama Pali fault scarp and the coastal flat. By 22 August, surface lava on the W branch of the PKK lava flow was no longer visible.
Thu, 25 Aug 2005, 14:35
Eruptive activity continues at Anatahan volcano in the Mariana Islands. Ash plumes, mainly observed by satellite and pilots, rise to heights of ~7.9 km (26,000 ft) a.s.l. Seismic activity continues at moderate levels.
Wed, 24 Aug 2005, 06:00
During 24-29 August, eruptive activity continued at Anatahan with ash plumes rising to a maximum height of ~6.7 km (22,000 ft) a.s.l. on the 25th. Volcanic tremor and sporadic long-period earthquakes continued to occur at the volcano.
Read allWed, 24 Aug 2005, 06:00
A plume from Barren Island was visible on satellite imagery on 25 August at a height of ~4.6 km (15,000 ft) a.s.l. Plumes were visible at a height of ~3 km (10,000 ft) a.s.l. on 29 and 30 August according to a pilot report and satellite imagery, respectively.
Read allWed, 24 Aug 2005, 06:00
AVO reduced the Concern Color Code at Cleveland from Yellow to "Not Assigned" on 27 August because there had been no evidence of activity at the volcano since a thermal feature was observed on satellite imagery on 11 August. Cleveland does not have a real-time seismic network; volcanoes without seismic networks are not assigned a color code of Green because without the seismic data, AVO has no definitive information that the level of activity of the volcano is at background.
Read allWed, 24 Aug 2005, 06:00
During 24-29 August, several small explosions occurred at Colima. Due to the threat of lahars forming on the volcano's flanks, Universidad de Colima advised avoiding the ravines of La Lumbre, San Antonio, Monte Grande (in Colima state), and La Arena (in Jalisco state).
Read allWed, 24 Aug 2005, 06:00
Volcano-tectonic earthquakes that began at Galeras around 19 August continued through 29 August. The earthquakes occurred at depths of 5-8 km and reached M 4.6. No surficial changes were observed at the volcano.
Read allWed, 24 Aug 2005, 06:00
Seismicity was above background levels at Karymsky during 19-26 August. Based on interpretations of seismic data, ash-and-gas plumes may have risen to 5.5 km (18,000 ft) a.s.l. On 22 August, three ash plumes reached heights around 3-4 km (9,800-13,100 ft) a.s.l. and extended ~130 km E.
Read allWed, 24 Aug 2005, 06:00
During 25-29 August, lava from Kilauea entered the sea at the East Lae`apuki area, and surface lava flows were visible on the Pulama Pali fault scarp and the coastal flat. Background volcanic tremor was around normal levels at Kilauea's summit. Volcanic tremor was at moderate levels at Pu`u `O`o.
Read allWed, 24 Aug 2005, 06:00
RVO reported that during 22-28 August, modest eruptive activity was observed at Langila's Crater 2. Occasional forceful emissions of ash produced plumes that rose ~1 km above the crater (or 7,600 ft a.s.l.) on 22 and 25 August, but reached only several hundred meters after that. The ash plumes drifted N and NW resulting in fine ashfall in downwind areas, including the town of Kilenge.
Read allWed, 24 Aug 2005, 06:00
Mild eruptive activity continued at Manam during 22-28 August, with occasional emissions of weak-to-moderate ash plumes on several days. Ash clouds emitted on 22 and 26 August rose several hundred meters above the volcano's crater and drifted NW, depositing ash in areas between the towns of Jogari and Kuluguma, and beyond to Boisa Island. Manam remained at Alert Level " Stage 1.".
Read allWed, 24 Aug 2005, 06:00
PHIVOLCS reported on 23 August that an aerial survey of Mayon conducted on 17 August revealed that lava had accumulated within the volcano's summit crater. The lava dome was extruding very slowly and the volume of lava was contained within the crater. PHIVOLCS warned that the volcano remains at Alert Level 2, and that people cannot enter the Permanent Danger Zone of 6 km radius around the volcano.
Read allWed, 24 Aug 2005, 06:00
During 22-28 August, ash emissions continued at Rabaul caldera's active Tavurvur cone. Ash plumes rose 800-1,500 m above the volcano (or 4,900- 7,200 ft a.s.l.) and drifted N and NW, depositing ash on the eastern part of Rabaul Town and beyond. Seismicity was at moderate-to-high levels, with most earthquakes associated with ash emissions and explosions.
Read allWed, 24 Aug 2005, 06:00
Growth of Shiveluch's lava dome continued during 19-26 August. During the report period, about ten shallow earthquakes were recorded, a large thermal anomaly was visible on satellite imagery, and fumarolic activity occurred. A photo taken by Yu Demyanchuk on 19 August showed a new viscous lava flow emitted from the lava dome.
Read all