Volcanic and seismic activity at Soufrière Hills remained at low levels during 21-28 May. Seismicity was dominated by signals from mudflows associated with the heavy rain of 21 May. The mudflows occurred during about 1420-1636 and were followed by a swarm of 44 small earthquakes.
Seismic unrest continued at Shishaldin during 21-28 May. It was characterized by weak seismic tremor and occasional discrete low-frequency earthquakes. Meteorological clouds obscured views of the volcano. Shishaldin remained at Concern Color Code Yellow.
On 21 May, observations of Shiveluch from a helicopter revealed pyroclastic flows and partial destruction of the lava dome. Ash deposits were concentrated in the central sector of the southern volcanic slope. During 21-28 May seismicity was above background levels, with a large number of shallow earthquakes occurring.
During 31 May to 1 June, weak-to-moderate explosions at Santa María's Santiaguito lava-dome complex produced gas-and-ash plumes that rose ~1.5 km above the crater. Small partial collapses at the edge of the Caliente lava dome produced avalanches of incandescent volcanic material down the SW flank.
On 26 May at 0643 a small emission from Popocatépetl of steam, gas, and small amounts of ash produced a plume that reached a height of ~1.5 km above the volcano's crater. Ash fell in Tetela del Volcán, Morelos. Also, an M 2.4 volcano-tectonic microearthquake occurred 2 km E of the crater.
The Toulouse VAAC reported that during 26 May to 1 June there were weak but steady emissions from Nyiragongo and neighboring Nyamuragira (~13 km NW from Nyiragongo). The Goma volcano observatory confirmed that ash fell within a radius of 60 km of both volcanoes.
The Toulouse VAAC reported that during 26 May to 1 June there were weak but steady emissions from Nyamuragira and neighboring Nyiragongo (~13 km SE from Nyamuragira). The Goma volcano observatory confirmed that ash fell within a radius of 60 km of both volcanoes.
Kilauea's Banana lava flow reached the sea on 30 May near the eastern end of the Wilipe`a lava delta. This was the first time lava had reached the sea since July 2003. The interaction of the water and lava was not explosive.
Wed, 26 May 2004, 06:00
Based on information from JMA, the Tokyo VAAC reported that Kikai erupted on 1 June at 1330. The resultant ash cloud rose to an unknown height and drifted W.
Read allWed, 26 May 2004, 06:00
During 31 May to 1 June moderate volcanic and seismic activity continued at Fuego, with several explosions producing ash plumes. The highest rising plume reached ~1.5 km above the volcano on 31 May. This explosion also produced avalanches of volcanic material down the ravines of Taniluyá and Santa Teresa.
Read allWed, 26 May 2004, 06:00
During 26-31 May, Dukono occasionally emitted plumes that were visible on satellite imagery at a height of ~3 km a.s.l.
Read allWed, 26 May 2004, 06:00
During late May low-level activity continued at Colima, with an average of two ash-containing explosions per day. The eruption clouds did not exceed 2 km above the volcano's crater and predominately drifted W.
Read allWed, 26 May 2004, 06:00
An ash plume from Bagana was visible on satellite imagery during 26-27 May. The plume reached a height of ~3 km a.s.l. and extended ~130 km NW.
Read allWed, 26 May 2004, 06:00
During 26 May to 1 June, elevated seismicity at Anatahan consisted of discrete explosion signals. Every few minutes explosions threw volcanic material hundreds of meters out of the crater, and steam and ash likely rose a few hundred meters.
Read allWed, 19 May 2004, 06:00
Unrest continued at Veniaminof during 14-21 May, characterized by intermittent volcanic tremor. The tremor was similar to seismic signals recorded the previous month in association with small ash plumes, suggesting that ash bursts continued. A pilot report on 18 May indicated the presence of an ash plume rising to heights of 300-900 m above the volcano's summit and extending ~32 km NE.
Read allWed, 19 May 2004, 06:00
According to DVGHM, the news reports of an eruption at Sirung around 13 May were false. There was no activity at the volcano.
Read allWed, 19 May 2004, 06:00
DVGHM reported a sudden increase in seismicity at Awu beginning on 16 May when 12 volcanic earthquakes were recorded. In addition, tremor was recorded during 1110-1540. Gas plumes rose ~75 m above the crater that were thicker than earlier in the month, but they did not change color or form clumps.
Read allWed, 19 May 2004, 06:00
During 19-24 May, small-to-moderate emissions of gas, steam, and ash continued at Tungurahua. The highest rising plume reached ~2.5 km above the volcano on 23 May. On the morning of 19 May a mudflow occurred in the Pampas sector, but it did not affect the highway.
Read allWed, 19 May 2004, 06:00
Volcanic and seismic activity at Soufrière Hills during 14-21 May remained at low levels. On 21 May intense rainfall produced large mudflows in the Belham Valley. At the peak of the activity, the entire width of the valley floor at Belham Bridge was flooded and standing waves up to 2 m high were observed.
Read allWed, 19 May 2004, 06:00
During 14-21 May seismic unrest continued at Shishaldin, characterized by weak seismic tremor and small explosions. On 16 May, a pilot reported an ash plume that rose ~300 m above the volcano's summit. Satellite imagery from 17 May showed a vigorous plume emanating from the summit that may have contained small amounts of ash.
Read allWed, 19 May 2004, 06:00
The Darwin VAAC reported that a thin ash plume from Semeru was visible on satellite imagery on 23 May around 0625. The plume reached a height of ~4.3 km a.s.l. and extended ~110 km SSE.
Read allWed, 19 May 2004, 06:00
During 18-21 May, weak-to-moderate explosions at Santa María's Santiaguito lava-dome complex produced gas-and-ash plumes that rose to ~1 km above the crater. Many of the moderate explosions were accompanied by avalanches of incandescent volcanic material. On 20 May around 1800 a small partial collapse at the edge of the Caliente lava dome produced an avalanche of incandescent volcanic material to the SW that reached the base of the dome.
Read allWed, 19 May 2004, 06:00
Strong rain on 15 May caused several lahars to travel down Reventador's flanks. They persisted through 16 May.
Read allWed, 19 May 2004, 06:00
The eruptive episode that began at Piton de la Fournaise on 2 May stopped on 18 May. This followed 2 days of high eruptive activity when numerous pahoehoe lava flows and Pele's hair were produced. Around 1550 on the 18th the amount of eruption tremor decreased, completely stopping at 1615 and signaling the eruption's end.
Read allWed, 19 May 2004, 06:00
The Toulouse VAAC reported that satellite imagery showed a weak eruption of Nyiragongo on 21 May. Activity intensified during the evening of 24 May. By the evening of 25 May, the volcano was no longer visible on satellite imagery due to meteorological clouds in the area.
Read allWed, 19 May 2004, 06:00
The Toulouse VAAC reported that satellite imagery showed a weak eruption of ash at Nyamuragira on 25 May.
Read allWed, 19 May 2004, 06:00
During 19-21 May, the Banana lava flow traveled toward down the Pulama pali toward the sea, reaching within ~200 m of the sea cliff before stopping on the morning of 21 May. Around this time, a few incandescent areas were visible along the flow. During 19-23 May, tremor was at low levels at Kilauea's summit and at moderate levels at Pu`u `O`o.
Read allWed, 19 May 2004, 06:00
During 18-21 May, moderate volcanic activity continued at Fuego. Several explosions produced ash plumes, with the highest one reaching ~1.2 km above the volcano on 20 May. On 21 May, avalanches of incandescent volcanic material traveled toward the ravines of Seca (to the W) and Taniluya (to the SW).
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