KVERT raised the Concern Color Code at Ebeko around 29 July from Green to Yellow. During 22-29 July, new fumaroles were noted in the volcano's active crater, and an explosion in the crater emitted hot steam. These types of strong changes in the crater had not been observed since 1982.
According to INETER, an eruption occurred at Concepción on the island of Ometepe on 28 July at dawn. Ash fell in the town of Moyagalpa (W of Ometepe island), and in the zones of Rivas, San Jorge, Buenos Aires, Potosí, and Belén. Seismic tremor was recorded at a seismic station N of the volcano, but no large earthquakes were recorded.
Rockfalls and associated minor ash plumes continued to be generated from Mount St Helen's growing lava dome during 27 July to 2 August. Measurements taken on 27 July revealed that emission rates of volcanic gases remained fairly constant, with 60 tons per day of sulfur dioxide and 880 tons per day of carbon dioxide. Analysis of a rock sample collected from the dome on 13 July showed no change in the composition of lava being extruded.
Seismic and volcanic activity at Soufrière Hills remained at elevated levels during 22-29 July. The seismic network recorded 29 volcano-tectonic, four hybrid, and five long-period earthquakes. It also recorded one explosion and 23 rockfalls.
Shiveluch's lava dome continued to grow during 22-29 July. On 23 July, a persistent thermal anomaly was visible on satellite imagery, and incandescence was observed at the lava dome. Shiveluch remained at Concern Color Code Orange.
Ash emissions occurred at Reventador during 27 July to 2 August, with plumes rising to 5.2 km (~17,000 ft) a.s.l.
A pilot observed an ash plume from Rabaul on 28 July at a height of 3 km (~10,000 ft) a.s.l. Ash was not visible on satellite data.
Several ash-and-steam emissions occurred at Popocatépetl during 27 July to 2 August, with the highest rising plume reaching 7.3 km (24,000 ft) a.s.l. on 29 July.
Wed, 27 Jul 2005, 06:00
A decrease in volcanic tremor at Kliuchevskoi during the end of the week of 22-29 July led KVERT to reduce the Concern Color Code from Orange to Yellow. On 22 July, weak ash-and-gas plumes rose to ~100 m above the crater (16,200 ft a.s.l.).
Read allWed, 27 Jul 2005, 06:00
On 30 July, small areas of surface lava were visible along Kilauea's PKK lava flow on the Pulama pali fault scarp. Background volcanic tremor was at normal levels at Kilauea's summit, and at moderate levels at Pu`u `O`o cone. There were periods of inflation and deformation.
Read allWed, 27 Jul 2005, 06:00
Seismicity was above background levels at Karymsky during 22-29 July. Based on interpretations of seismic data, ash-and-gas plumes may have reached heights of 2.5-3 km (8,200-9,800 ft) a.s.l. On 22 July, a weak thermal anomaly and a short E-drifting ash-and-gas plume were visible on satellite imagery.
Read allWed, 27 Jul 2005, 06:00
Satellite imagery showed an ash cloud from Karangetang on 2 August at a height of 4.6 km (~15,000 ft) a.s.l.
Read allWed, 27 Jul 2005, 06:00
During 29 July to 1 August, steam-and-ash emissions occurred from Colima. According to the Washington VAAC, the highest-rising emission reached 6.1 km (~20,000 ft) a.s.l. on 30 July.
Read allWed, 27 Jul 2005, 06:00
Satellite imagery of Cleveland during 22-29 July showed minor steaming from the volcano's summit, possible fresh localized ash deposits, and a weak thermal anomaly. According to AVO, these observations suggested that low-level volcanic unrest continued. Cleveland remained at Concern Color Code Yellow.
Read allWed, 27 Jul 2005, 06:00
During 27 July to 1 August, eruptive activity continued at Anatahan, with plumes rising several thousands of meters above the volcano. On 1 August the National Weather Service at Tiyan, Guam issued a volcanic ash advisory for the islands of Saipan and Tinian. A strong sulfur odor was reported by numerous residents, and ash was observed on the tips of aircraft at Saipan International Airport.
Read allWed, 20 Jul 2005, 21:35
Fuego volcano had a small explosive eruption on 17 July that produced an ash plume reaching a height of 3.5-4 km above the crater and producing small pyroclastic flows that traveled down Santa Teresa and Taniluyá ravines.
Read allWed, 20 Jul 2005, 06:00
During 20-26 July, volcanic and seismic activity were at relatively low levels at Tungurahua. Low-energy plumes were emitted that were composed of gas, steam, and occasionally small amounts of ash.
Read allWed, 20 Jul 2005, 06:00
DVGHM increased the Alert Level at Talang from 2 to 3 on 18 July due to an increase in seismicity at the volcano. During 15-18 July, the seismic network recorded 93 deep volcanic earthquakes, one low-frequency tremor, and three "felt shocks" around the N slope of the crater. Minor phreatic activity occurred at the southern and northern slope craters, with ash plumes rising 0.5-1.5 km above the crater (11,100-14,400 ft a.s.l.).
Read allWed, 20 Jul 2005, 06:00
DVGHM raised the Alert Level at Marapi from 1 to 2 on 18 July after the number of earthquakes increased dramatically during 8-14 July. During this period, the volcano's seismic network recorded 112 deep volcanic earthquakes. Normally, an average of 7 deep volcanic earthquakes occur in 1 week.
Read allWed, 20 Jul 2005, 06:00
During 20-26 July, several rockfalls at Mount St. Helens were triggered by earthquakes around M 3. Some of the rockfalls produced ash plumes that rose to low altitudes.
Read allWed, 20 Jul 2005, 06:00
Seismic and volcanic activity remained at elevated levels at Soufrière Hills during 15-22 July. The seismic network recorded 19 volcano-tectonic, 16 hybrid, and 13 long-period earthquakes. It also recorded 11 rockfalls and one explosion.
Read allWed, 20 Jul 2005, 06:00
Growth of Shiveluch's lava dome continued during 15-22 July. A gas-and-steam plume rose to ~3.5 km (~11,500 ft) a.s.l. on 19 July. Shiveluch remained at Concern Color Code Orange.
Read allWed, 20 Jul 2005, 06:00
During 7-17 July, scientists noted that a lava flow (lava number 5) was no longer flowing in a direction that threatened a highway or pipe lines. In addition, plumes of steam, gas, and ash rose to heights of 0.5-2 km above the crater (13,300-18,200 ft a.s.l.) and typically drifted NW.
Read allWed, 20 Jul 2005, 06:00
Several low-intensity emissions occurred at Popocatépetl during 21-25 July. On 21 July at 0906, an emission produced a plume to a height of ~2 km above the volcano's crater (~24,400 ft a.s.l.). Based on information from the Mexico City MWO, the Washington VAAC reported that ash visible on the web video camera rose to ~2.8 km above the crater (27,000 ft a.s.l.).
Read allWed, 20 Jul 2005, 06:00
Ash from Manam was visible on satellite imagery on 29 July. The height of the plume was not reported.
Read allWed, 20 Jul 2005, 06:00
Seismicity was above background levels at Kliuchevskoi during 15-22 July, with spasmodic volcanic tremor and shallow earthquakes occurring. A gas-and-steam plume rose ~5.5 km above the crater (~33,900 ft a.s.l.) on 19 July. Kliuchevskoi remained at Concern Color Code Orange.
Read allWed, 20 Jul 2005, 06:00
During 21-26 July, lava from Kilauea continued to enter the sea at the East Kamoamoa and East Lae`apuki entries. Small areas of surface lava were occasionally visible along the PKK lava flow. Background volcanic tremor was well above normal levels at Kilauea's summit and at moderate levels at Pu`u `O`o cone.
Read allWed, 20 Jul 2005, 06:00
Seismicity was above background levels at Karymsky during 15-22 July, with 350-700 shallow earthquakes occurring daily. Based on interpretations of seismic data, ash-and-gas explosions may have produced plumes to heights of 1-1.5 km above the crater (8,300-10,000 ft a.s.l.). An ash-and-gas plume extended about 11 km SE on 11 July.
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