Since February the subterminal south east crater has undergone to several rock slidings of its inner walls and a large collapse pit has formed on the E side of the cone.
During 27 April to 3 May, volcanic and seismic activity were at relatively low levels at Tungurahua. Low-energy gas-and-steam plumes were emitted.
Harmonic tremor at Anatahan dropped dramatically on 1 May after being at high levels for several days. During 27 April to 1 May, the main ash-and-steam plume rose to ~3 km (~10,000 feet) a.s.l. According to a news article, the volcanic plume from Anatahan reached Philippine airspace on 4 May.
During 27 April to 2 May, mild ash-and-steam emissions from Canlaon produced plumes to a maximum height of 1 km above the volcano (11,300 ft a.s.l.). The sulfur-dioxide flux began to increase on 28 April, reaching 2,700 tons on 1 May. According to news reports, flights to and from nearby Kalibo airport were suspended on 3 May due to reduced visibility.
Seismicity at Karymsky was above background levels during 22-29 April, with 300-650 shallow earthquakes occurring daily. Possible ash-and-gas explosions rose to a height of ~1 km above the volcano's crater (~8,300 a.s.l.). The evenings of 26 and 27 April, Strombolian activity was seen in two of the volcano's crater.
During 27 April to 3 May, lava entered the ocean at the Kamoamoa entry. Numerous surface lava flows were visible on the coastal flat. Seismicity remained above background levels at Kilauea's summit, consisting of both tremor and long-period earthquakes.
Based on information from RVO, the Darwin VAAC reported that ash emissions from Langila rose to ~2.1 km (~7,000 ft) a.s.l. on 3 May. A very small plume and a hot spot were visible on satellite imagery.
During 28 April to 3 May a thin plume from Manam was visible on satellite imagery. RVO reported that mild eruptive activity continued at the volcano. Manam remained at Stage 2 Alert Level.
Wed, 27 Apr 2005, 06:00
On 25 April, a hot avalanche on Shiveluch lava dome's W side produced an ash plume that rose ~2 km above the 2.5-km-high lava dome (14,800 ft a.s.l.). During 22-29 April, gas-and-steam plumes rose to a maximum height of 1 km above the lava dome (11,500 ft a.s.l.). Shiveluch remained at Concern Color Code Orange.
Read allWed, 27 Apr 2005, 06:00
Steam venting that began at the NW side of Soufrière Hills'crater on 15 April continued during 22-29 April. An average sulfur-dioxide flux of 304 metric tons per day was measured during 4 days in the report week. This value was below the long-term eruption average of 500 metric tons per day.
Read allWed, 27 Apr 2005, 06:00
During 22-29 April, elevated levels of seismicity continued to be recorded at Spurr. Thermal imagery taken on 25 April revealed that temperatures in the summit melt-pit region were similar to those recorded in September 2004, with values as high as 40 degrees Celsius in scattered patches of exposed rock. The lake in the summit crater continued to be discolored, and there was a strong scent of sulfur in the area, indicating continued gas emission.
Read allWed, 27 Apr 2005, 06:00
During 27 April to 3 May, growth of the new lava dome inside the crater of Mount St. Helens continued, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. On the morning of 28 April there were reports of minor amounts of ashfall in the eastern part of the Portland metropolitan area.
Read allWed, 27 Apr 2005, 06:00
Based on information from JMA, the Tokyo VAAC reported that an eruption at Suwanose-jima on April 26 produced a plume to 1.2 km (4,000 ft) a.s.l. that extended E.
Read allWed, 27 Apr 2005, 06:00
Due to a decrease in seismicity at Talang during 24-28 April, DVGHM reduced the Alert Level from 3 to 2 (on a scale of 1-4) on 28 April. Visitors were still not permitted to enter within a 1 km radius of the crater.
Read allWed, 20 Apr 2005, 06:00
Soputan began to erupt on 20 April at 0630, with a plume reaching ~1 km above the volcano's summit (~9,100 ft a.s.l.) and drifting SE. In addition, lava fountains rose ~200 m above the volcano (~6,500 ft a.s.l.). During 20 April at 1720 to 21 April at 0900, lava fountains rose 75-100 m above the volcano (6,100-6,200 ft a.s.l.).
Read allWed, 20 Apr 2005, 06:00
During 20-25 April, volcanic and seismic activity were at relatively low levels at Tungurahua. Low-energy gas-and-steam plumes were emitted. On 20 and 21 April rain generated lahars that traveled down the volcano's W flank near the settlement of Bilbao (8 km W).
Read allWed, 20 Apr 2005, 06:00
Occasional seismic data from Anatahan revealed that seismicity appeared to increase during 24-25 April. During 20-25 April, a continuous thin plume of ash-and-steam rose to less than ~3 km (~10,000 ft) a.s.l. and drifted more than 185 km from the volcano.
Read allWed, 20 Apr 2005, 06:00
During 15-22 April, satellite imagery of Chikurachki lacked a thermal anomaly or ash plumes, so KVERT reduced the Concern Color Code from Orange to Yellow.
Read allWed, 20 Apr 2005, 06:00
Several explosions occurred at Colima during 20-25 April. According to the Washington VAAC, an explosion on 20 April produced an ash plume to a height of ~6.1 km (~20,000 ft) a.s.l.
Read allWed, 20 Apr 2005, 06:00
During 21-25 April, explosions at Fuego generated small lava avalanches to the W and SW. Also, lava flows traveled ~400 m W and ~250 m SW. Blocks of lava spalled from the front of the lava flows.
Read allWed, 20 Apr 2005, 06:00
Mild ash eruptions continued at Canlaon during 21-26 April, producing plumes as high as 1 km above the volcano (11,300 ft a.s.l.). Emissions on 21 April drifted SW and deposited small amounts of ash in the villages of Sagang, Mansalanao, Old Fabrica, Biak-na-Bato, Kamandag, Tinago, and Cabagnaan of the town La Castillana. Emissions on 22 April deposited ash in Manghanoy and Cabagnaan.
Read allWed, 20 Apr 2005, 06:00
Seismic activity at Karymsky was above background levels during 15-22 April, with 250-500 shallow earthquakes occurring daily. During 14-15 April, possible ash-and-gas explosions rose to 1.5 km above the crater (10,000 ft a.s.l.). Strombolian activity was observed on the evening of 20 April.
Read allWed, 20 Apr 2005, 06:00
During 21-25 April, there were fewer surface lava flows visible at Kilauea than during the previous week. On 24 April a small amount of lava began to enter the sea. Seismicity remained above background levels at Kilauea's summit, consisting mainly of tremor and some long-period earthquakes.
Read allWed, 20 Apr 2005, 06:00
Small explosions occurred at Pacaya during 21-25 April. A ~250-m-long lava flow was on the volcano's W flanks.
Read allWed, 20 Apr 2005, 06:00
Based on a pilot report to the Guayaquil MWO, the Washington VAAC reported that ash from Reventador was seen on 25 April around 0826 at a height of ~7.9 km (~26,000 ft) a.s.l. drifting S. Ash was not visible on satellite imagery.
Read allWed, 20 Apr 2005, 06:00
Several explosions occurred at Santa María's Santiaguito lava-dome complex during 21-25 April. Lava avalanches occurred down the SW flank of Caliente Dome. Ash plumes rose to ~1.2 km above the dome (~16,300 ft a.s.l.).
Read allWed, 20 Apr 2005, 06:00
During 15-22 April, gas-and-steam plumes rose to ~1.2 km above Shiveluch's 2.5-km-high lava dome (~12,100 ft a.s.l.). Satellite imagery showed a large thermal anomaly at the lava dome on 16, and 18-21 April, and a small anomaly associated with a pyroclastic flow on the 19th. Shiveluch remained at Concern Color Code Orange.
Read allWed, 20 Apr 2005, 06:00
Beginning on 15 April, vigorous steam-and-ash venting occurred on the NW side of Soufrière Hills crater. It was accompanied by tremor, which decreased during the following days and stopped on 18 April. Rainfall on 21 April caused a small mudflow in the Belham River Valley to the NE of the volcano.
Read all
