A new seismic event began at Piton de la Fournaise on 2 May at 1903, following one month of relatively high seismic activity at the volcano (with 10-30 earthquakes per day and two minor seismic crises) and continuous inflation at the summit. At 1936, eruption tremor began. The high intensity of tremor near Bory crater indicated that an eruption probably started within or very close to the crater.
During 27 April to 4 May, emissions of gas and ash continued at Tungurahua. Volcano-tectonic earthquakes on 27 and 28 April preceded a slight increase in the number of sudden explosions at Tungurahua on 30 April. According to a news article, on 1 and 2 May ash fell in the towns of Cotaló and San Juan (W of the volcano).
According to the Tokyo VAAC, ash emitted from Suwanose-jima was reported on 28 April at a height of ~3 km a.s.l. extending SE. No ash was visible on satellite imagery. JMA reported that an explosion occurred on 1 May at 0906, but it was not known if an ash cloud was produced.
Volcanic activity at Soufrière Hills was at low levels during 23-30 April. Seismicity included low-level tremor, spasmodic tremor, and small numbers of long-period and hybrid earthquakes. A large hybrid earthquake on 29 April at 1540 resulted in a small amount of ash venting from the summit.
During 28 April to 4 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. Small partial collapses at the edge of the Caliente lava dome produced avalanches of incandescent volcanic material to the SW. An explosion on 27 April produced a pyroclastic flow that traveled ~3 km to the SW.
Based on a pilots report, the Washington VAAC reported that ash from an eruption at Sangay produced a plume to a height of ~6 km a.s.l. on 1 May at 1750. Ash was not visible on satellite imagery.
During 28 April to 4 May, lava from Kilauea continued to flow down the Pulama Pali and incandescence was observed in the crater of Pu`u `O`o. On 2 May, lava from the recently named Banana flow began pouring over Paliuli and advanced onto the coastal flat. By 4 May the lava-flow front was ~1 km from the ocean, the closest proximity to the coast since the fall of 2003.
During 28 April to 4 May, explosions at Fuego produced gas-and-ash clouds. On 28 April, an explosion produced an ash plume to ~1.5 km above the volcano, and ash was deposited ~4 km SW of the volcano in the villages of Panimaché I and Panimaché II. In addition, a small avalanche of volcanic material traveled W toward Santa Teresa Ravine.
Wed, 28 Apr 2004, 06:00
During 28 April to 4 May, Dukono occasionally emitted ash plumes that were visible on satellite imagery. Plumes rose to heights of ~3 km a.s.l.
Read allWed, 28 Apr 2004, 06:00
According to a news article, following the emission of new lava from Bagana on 27 April, local volcanologists and a team of provincial disaster delegates conducted an aerial inspection of the area around the volcano on 2 May. The team concluded that the lava flows were not an immediate threat to the safety of villagers near the volcano. A spokesperson for Papua New Guinea's national Disaster Center reportedly said, "the aerial inspection team noted a continual effusion of lava flowing in a south-westerly direction but there is a lot of vegetation in the area which is acting as a buffer.".
Read allWed, 28 Apr 2004, 06:00
Early on 28 April, the level of seismicity at Anatahan increased to its highest level since renewed seismic activity began on 24 April. At this time the lava dome probably increased in size. Seismicity decreased somewhat during the following ~5 days, but M 2-2.5 earthquakes and small explosions still occurred about every minute, and steam-and-ash emissions still rose several hundred meters above the volcano.
Read allWed, 28 Apr 2004, 06:00
Based on information from JMA, the Tokyo VAAC reported that an eruption at Sakura-jima on 28 April at 1820 produced a plume to a height of ~2.4 km a.s.l. that drifted SE. No ash was visible on satellite imagery.
Read allWed, 21 Apr 2004, 06:00
After a period of heightened seismicity at Veniaminof during 14-17 April that led AVO to increase the Concern Color Code from Green to Yellow, there was a marked decrease in the episodes of low-level volcanic tremor and small volcanic earthquakes through 26 April. A newly installed internet-based video camera located in Perryville allowed AVO to observe the volcano during clear weather. During the afternoon and evening of 25 April, more than 25 small steam-and-ash emissions were seen during an 8-hour period, producing clouds that rose 300-600 m above the active cone.
Read allWed, 21 Apr 2004, 06:00
A helicopter pilot reported to RVO that new lava was being emitted from Bagana around 1240 on 27 April. According to information from the village of Torokina, the lava flow was estimated to be about 8-9 km from the village. RVO was uncertain about the local topography between the volcano and Torokina, and therefore could not assess the degree of danger for the residents of the village from the lava flow.
Read allWed, 21 Apr 2004, 06:00
Volcanic activity at Tungurahua during 22-26 April was at moderate levels. On 21 April, a column of steam, gas, and ash rose to a height of ~1 km above the volcano and drifted NW. Ash fell in Bilbao, Cusúa, San Juan, Cotaló, Pillate, and Juive sectors.
Read allWed, 21 Apr 2004, 06:00
Volcanic and seismic activity at Soufrière Hills were at low levels during 16-23 April. Seismicity was characterized by periods of continuous and spasmodic tremor punctuated by long-period hybrid earthquakes. Continuous low-level tremor occurred on 16 April with a second episode during 18-19 April.
Read allWed, 21 Apr 2004, 06:00
Seismicity was above background levels at Shiveluch during 16-23 April, with a large number of weak earthquakes occurring 0-5 km beneath the active lava dome and ten M 1.5-2.7 earthquakes. Based on interpretations of seismic data, during 15-18, and 21 April six ash-and-gas explosions may have produced plumes to 4-7 km a.s.l. The highest rising observed plume (8 km a.s.l.) was produced from an ash-and-gas explosion on 18 April.
Read allWed, 21 Apr 2004, 06:00
The Darwin VAAC reported that an ash plume from Semeru was visible on satellite imagery on 21 April. The plume rose to ~4.6 km a.s.l. and drifted ESE.
Read allWed, 21 Apr 2004, 06:00
During 22-27 April, explosions at Santa María's Santiaguito lava-dome complex produced gas-and-ash plumes that rose to ~1 km above the crater. Small avalanches of incandescent volcanic material descended the SW side of the Caliente dome.
Read allWed, 21 Apr 2004, 06:00
During 22-27 April, lava from Kilauea continued to slowly flow down the Pulama Pali and incandescence was observed in the crater of Pu`u `O`o. During most of the report period, tremor was at low levels at Kilauea's summit. Tremor was at moderate levels at Pu`u `O`o.
Read allWed, 21 Apr 2004, 06:00
Seismicity was above background levels at Karymsky during 16-23 April, with 240-450 shallow earthquakes occurring per day. Based on interpretations of seismic data, ash-and-gas explosions may have produced plumes to 2.5-3.5 km a.s.l. daily.
Read allWed, 21 Apr 2004, 06:00
During 22-27 April, weak explosions at Fuego produced gas-and-steam clouds to ~1 km above the volcano. In addition, small avalanches of volcanic material occasionally traveled W toward Santa Teresa Ravine.
Read allWed, 21 Apr 2004, 06:00
During 21-27 April, Dukono occasionally emitted ash plumes that were visible on satellite imagery. Plumes rose to heights of ~3 km a.s.l.
Read allWed, 21 Apr 2004, 06:00
Seismicity at Anatahan increased abruptly on 24 April at 1052 to a level that had not been reached since the summer of 2003. Around 0600 on 26 April, seismicity leveled off. Later that day, during two 30-minute observation periods, scientists saw regular puffs of yellow/brown steam and ash emitted at 1- to 2-minute intervals.
Read allWed, 21 Apr 2004, 06:00
Based on information from JMA, the Tokyo VAAC reported that an eruption of Sakura-jima on 25 April produced an ash plume that rose to a height of ~2.4 km a.s.l. and extended N.
Read allWed, 14 Apr 2004, 06:00
On 14 April, the Darwin VAAC reported that Ulawun emitted an ash plume that rose to ~3 km a.s.l. and extended ~37 km NE.
Read allWed, 14 Apr 2004, 06:00
During 10-17 April, Veniaminof showed heightened seismicity with several episodes of volcanic tremor and earthquakes. Seismicity decreased significantly prior to the emission of a gas plume with some ash throughout 18 April. The most vigorous phase occurred at about 1730 on 18 April when the plume rose to ~0.5 km above the crater.
Read allWed, 14 Apr 2004, 06:00
During 13-18 April, activity at Tungurahua remained at low levels with few explosions reported. Seismicity was restricted to less than ten long-period earthquakes per day, with occasional episodes of tremor related to gas-and-steam emissions. Heavy rain during the afternoon and night of 13 April triggered a lahar that cut the La Pampa section of the Baños-Pelileo road.
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