Wed, 30 Jun 2004, 06:00
During 2-6 July, thin plumes from Ulawun were visible on satellite imagery at heights around 3 km a.s.l. extending as far as ~90 km.
Wed, 30 Jun 2004, 06:00During 29 June to 5 July the level of volcanic and seismic activity diminished at Tungurahua in comparison to the previous week, with sporadic moderate explosions of ash and gas. The highest rising plume reached ~1.5 km above the volcano. During the report period, seismicity was at relatively low levels.
Wed, 30 Jun 2004, 06:00
Based on information from JMA, the Tokyo VAAC reported that several explosions occurred at Suwanose-jima during 30 June to 5 July. The highest rising plume reached ~1.9 km a.s.l.
Wed, 30 Jun 2004, 06:00Volcanic and seismic activity at Soufrière Hills were at low levels during 25 June to 2 July. The seismic network recorded 2 long-period earthquakes, 6 volcano-tectonic earthquakes, 5 hybrid earthquakes, and 8 rockfalls. A peak sulfur-dioxide flux of ~365 metric tons was measured on 27 June.
Wed, 30 Jun 2004, 06:00
Seismicity was above background levels at Shiveluch during 25 June to 2 July, with several shallow earthquakes occurring beneath the active lava dome. Gas-and-steam plumes were seen rising to ~3.5 km a.s.l. Shiveluch remained at Concern Color Code Orange.
Wed, 30 Jun 2004, 06:00During 1-6 July weak-to-moderate explosions occurred at the Santa María lava-dome complex, producing plumes to a maximum height of ~1.5 km above the volcano. Several partial lava-dome collapses produced avalanches that traveled down the sides of Caliente cone.
Wed, 30 Jun 2004, 06:00
On 4 July at 0615, a narrow plume of steam and/or ash from Masaya was visible on satellite imagery extending to the SW. By 0715 the plume extended ~12 km from the summit.
Wed, 30 Jun 2004, 06:00During 29 June to 6 July, lava continued to flow down the Pulama pali scarp and small amounts flowed into the sea. In addition, vents at Pu`u `O`o cone were incandescent. A few small earthquakes continued beneath Kilauea's summit, but no tremor was recorded.
Wed, 30 Jun 2004, 06:00
Seismicity at Karymsky was above background levels during 24-28 June, with 300-400 shallow earthquakes occurring. During 29-30 June, the number of earthquakes increased to 600-950. Based on interpretations of seismic data, daily ash-and-gas explosions may have risen to 2.5-4.5 a.s.l.
Read all
Wed, 30 Jun 2004, 06:00During 1-6 July, small explosions at Fuego produced plumes to ~1.4 km above the volcano that predominately drifted SW. Occasional avalanches of volcanic material traveled down ravines flanking the volcano.
Read all
Wed, 30 Jun 2004, 06:00
On 29 June and 4 July low-level volcanic activity continued at Colima, with an average of three ash explosions occurring daily. The resultant ash plumes did not exceed heights of 2 km above the crater.
Read all
Wed, 30 Jun 2004, 06:00On 2 July, the seismicity level at Anatahan rose nearly as high as it was in late April 2004. After the 2nd, seismicity declined slightly. The nature of the seismic signals suggested that Strombolian explosions occurred at intervals of tens of seconds to minutes.
Read all
Wed, 30 Jun 2004, 06:00
On 2 July an explosion at Sakura-jima produced a S-drifting ash cloud to a height of ~1.5 km a.s.l. Another explosion later that day produced an ash cloud to an unknown height.
Read all
Wed, 23 Jun 2004, 06:00At Tungurahua during 23-28 June, there were several emissions of steam, gas, and moderate amounts of ash. About 5-10 small-to-moderate explosions occurred daily. Plumes from eruptions rose to ~1.5 km above the crater. Seismicity was characterized by long-period earthquakes.
Read all
Wed, 23 Jun 2004, 06:00
Activity at Soufrière Hills remained at low levels during 18-25 June. Most seismic activity occurred during 18-20 June, with extremely low seismicity during the remainder of the report period. The upper portions of the lava-dome complex within the crater were visible for the first time since 7 May 2004, revealing that parts of the dome had been lost.
Read all
Wed, 23 Jun 2004, 06:00Seismic unrest continued at Shishaldin during 18-25 June, with weak tremor and occasional discrete low-frequency earthquakes occurring. A pilot reported seeing steam rise to low levels above Shishaldin's cone. Around that time, a possible weak thermal anomaly was visible on satellite imagery.
Read all
Wed, 23 Jun 2004, 06:00
Seismicity was above background levels at Shiveluch during 18-25 June. Shallow earthquakes up to M 1.75 were recorded, along with nearly continuous spasmodic tremor. Gas plumes rose to ~4 km a.s.l.
Read all
Wed, 23 Jun 2004, 06:00Weak-to-moderate explosions occurred at Santa María's Santiaguito lava-dome complex during 25-29 June. Plumes rose to ~1 km above the crater and there were sporadic, weak avalanches of volcanic material. On 28 June at 0622, a partial lava-dome collapse sent material down the W side of Caliente cone for ~40 minutes.
Read all
Wed, 23 Jun 2004, 06:00
Satellite imagery showed that ash emissions from Nyiragongo that began on 4 June appeared to have ceased by 22 June.
Read all
Wed, 23 Jun 2004, 06:00During 24-28 June, lava continued to flow down the Pulama Pali scarp, Paliuli, and into the sea. In addition, vents at Pu`u `O`o cone were incandescent. A few small earthquakes continued beneath Kilauea's summit, but no tremor was recorded.
Read all
Wed, 23 Jun 2004, 06:00
Seismicity remained above background levels at Karymsky during 18-25 June, with 300-350 shallow earthquakes occurring per day. Based on interpretations of seismic data, possible ash-and-gas explosions rose daily to 2.5-4.5 km a.s.l. Pilots saw an ash plume on 17 June rise to ~2.5 km a.s.l.
Read all
Wed, 23 Jun 2004, 06:00On 28 and 29 June, small explosions at Fuego produced plumes to ~0.8 km above the volcano that predominately drifted SW. Incandescence was visible in the crater at night.
Read all
Wed, 23 Jun 2004, 06:00
On 21 June low-level activity continued at Colima, with an average of three ash explosions occurring daily. The resultant ash plumes did not exceed heights of 2 km above the crater.
Read all
Wed, 23 Jun 2004, 06:00An eruption at Bezymianny produced an ash cloud that during 18-19 June extended more than 1,000 km E and SE from the volcano and possible ash deposits extended 190 km SE from the lava dome. Seismicity at Bezymianny did not exceed background levels during 20-23 June. The Concern Color Code at Bezymianny was reduced from Orange to Yellow around 25 June.
Read all
Wed, 23 Jun 2004, 06:00
During 14-16 June, the level of seismicity was significantly lower at Anatahan than during the previous week. After the 16th, seismicity returned to the higher levels seen before the 14th and remained there through 28 June. On the 28th a tropical storm knocked out the last seismic station on Anatahan, prohibiting further monitoring until it is repaired.
Read all
Wed, 16 Jun 2004, 06:00During 11-18 June, bursts of volcanic tremor continued intermittently at Veniaminof that may have been indicative of small, low-level ash emissions. On 16 June at 2350, a pilot observed an ash cloud that rose to a height of ~2.7 km a.s.l. The plume was also visible on satellite imagery.
Read all
Wed, 16 Jun 2004, 06:00
According to the Darwin VAAC, on 22 June an ash plume from Kerinci was observed drifting W at a height of ~3.8 km a.s.l. No ash was visible on satellite imagery.
Read all
Wed, 16 Jun 2004, 06:00According to a news article, people were prohibited from visiting Ijen due to an increase in activity beginning on 17 June. The chief of the national park was reported as saying, "There have been sulfuric rocks coming out of the edge of the crater and the fluid in it [crater lake] has turned from green to white and it has emitted hot foam. There are also increasing tremors.".
Read all
