During 30 March to 3 April, volcanic activity at Tungurahua was at relatively low levels, but emissions of steam and ash occurred and incandescence was visible in the crater. On 4 April at 1902 an explosion produced a plume containing a moderate amount of ash that rose to 800 m above the crater.
Seismic and volcanic activity were at moderate levels at Soufrière Hills during 26 March to 2 April. Seismicity was dominated by near-continuous low-to-moderate tremor. Vigorous steam venting was visible from several areas of the crater, but no new lava-dome growth occurred.
According to KVERT, during 26 March to 2 April seismicity was above background levels at Shiveluch. About 14 shallow earthquakes up to M 2 occurred during 25 and 28-31 March. Based on interpretations of seismic data, 15 ash-and-gas explosions may have produced plumes to 5 km a.s.l. during 25 and 28-31 March.
During 31 March to 6 April, weak-to-moderate explosions continued at Santa Maria's Santiaguito lava-dome complex, producing plumes to 1.3 km above the volcano. Several partial lava-dome collapses produced avalanches down the volcano's S flank. A strong explosion on 1 April at 1706 caused a partial lava-dome collapse and produced a pyroclastic flow that traveled ~4 km SW toward the Nimá II river.
During 31 March to 5 April, surface lava flows were visible at the southern part of Kilauea's rootless-shield complex, which is along the Mother's Day lava tube several hundred meters S of Pu`u `O`o cone. Incandescence was also visible from several vents in the crater of Pu`u `O`o. Seismicity was at low levels at Kilauea's summit, and tremor at Pu`u `O`o remained moderate.
Seismicity remained above background levels at Karymsky during 26 March to 2 April, with 240-380 shallow earthquakes occurring per day. Based on interpretations of seismic data, plumes from ash-and-gas explosions may have reached 3.5 km a.s.l. every day.
During 31 March to 6 April, weak-to-moderate explosions continued at Fuego. The highest rising ash plume produced from the explosions reached ~1.2 km above the volcano on 5 April and drifted SSE. Lahars flowed down Seca Ravine on 30 March, and near the village of Sangre de Cristo on 3 April.
During 31 March to 6 April, ash clouds emitted from Dukono were sometimes visible on satellite imagery at a height of ~3 km a.s.l.
Wed, 31 Mar 2004, 06:00
A seismic swarm began beneath Anatahan on 31 March. During 31 March to at least 4 April, volcanic seismicity was at its highest level since the eruption of May-June 2003, with events as large as M 2.5. The earthquakes were usually followed by tremor-like signals that scientists believed indicated steam and/or ash emissions to altitudes well below 1 km.
Read allWed, 31 Mar 2004, 06:00
According to a report from John Seach, during March an active lava lake was present in Ambrym's Mbwelesu crater.
Read allWed, 24 Mar 2004, 06:00
Tungurahua remained at a low level of activity with constant degassing only interrupted by sporadic small explosions. During the night of 28-29 March incandescent material was observed avalanching on the upper slopes.
Read allWed, 24 Mar 2004, 06:00
On 23 March at around 1000 a seismic swarm began at South Sister that lasted ~48 hours. Over 300 volcano-tectonic earthquakes up to M 1.9 were recorded. The earthquakes were located in the NE quadrant of the area of on-going uplift.
Read allWed, 24 Mar 2004, 06:00
Based on a report by an observer from The Wilderness Lodge, a news article indicated that Kavachi recently began to erupt after a long quiet period.
Read allWed, 24 Mar 2004, 06:00
During 19-26 March, activity remained elevated at Soufrière Hills. The seismic network recorded four long-period and seven hybrid earthquakes. Continuous low-level tremor was interrupted by several periods of moderate-level tremor lasting from less than 1 hour to 12 hours.
Read allWed, 24 Mar 2004, 06:00
During 19-26 March, seismic activity was above background levels at Shiveluch with many shallow earthquakes up to M 1.75 recorded. Based on interpretations of seismic data, a pyroclastic flow occurred on 19 March and explosions produced gas-and-ash plumes on 19-20 and 25 March that might have reached 6-7 km a.s.l. on two occasions and 3.5-4.5 km a.s.l. on nine other occasions.
Read allWed, 24 Mar 2004, 06:00
Weak to moderate explosions at Santa María's Santiaguito lava dome produced plumes up to 1 km above the vent. Light ashfall occurred in nearby areas on several occasions during the reporting period. On 25 March incandescent avalanches derived from the S flank of the Caliente dome flowed to the SE along various routes.
Read allWed, 24 Mar 2004, 06:00
Popocatépetl remained at a low level of activity for the reporting period, occasionally producing gas-and-steam plumes. On 25 March the volcanic alert status was lowered to Yellow-1.
Read allWed, 24 Mar 2004, 06:00
During 24-30 March, two surface lava flows were active at the southern part of Kilauea's rootless-shield complex: the MLK flow and the Kuhio flow. The summit-deflation event that began on 20 March ended on 23 March, with only minor inflation and deflation events recorded after 23 March. A weak swarm of low-frequency earthquakes and a 2-hour period of moderate-to-strong volcano-tectonic earthquakes were recorded during 24-25 March.
Read allWed, 24 Mar 2004, 06:00
Based on information from the Japanese Meteorological Agency, the Tokyo VAAC reported that Kikai erupted on 24 March at 1755 and on 25 March at 0715, producing plumes that reached a height of ~1.5 km a.s.l. and extended S and NW, respectively. No ash was visible on satellite imagery.
Read allWed, 24 Mar 2004, 06:00
During 19-26 March seismicity was above background levels at Karymsky with 250-300 shallow earthquakes per day. Based on interpretations of seismic data, daily explosions may have produced ash-and-gas plumes to a height of ~3.5 km a.s.l. Karymsky remained at Concern Color Code Orange.
Read allWed, 24 Mar 2004, 06:00
During 24-30 March, sporadic weak explosions and three strong explosions were recorded at Fuego. On 26 March a strong explosion produced an ash plume that reached ~1 km above the vent and caused incandescent avalanches in the Zanjón Barranca Seca and Trinidad ravines. On 29 March two explosions within 7 minutes produced gas-and-ash plumes that reached heights of ~1 km above the vent.
Read allWed, 24 Mar 2004, 06:00
According to the Darwin VAAC, during 24-28 March ash plumes were visible on satellite imagery reaching a height of ~3 km a.s.l. On 24 March one of these plumes extended ~185 km E.
Read allWed, 24 Mar 2004, 06:00
Based on information from the Japanese Meteorological Agency, the Tokyo VAAC reported that explosions at Sakura-jima on 26 March at 1715 and 27 March at 0607 produced plumes that extended S and rose to ~2.5 km a.s.l. and ~2 km a.s.l., respectively.
Read allWed, 17 Mar 2004, 06:00
During 16-23 March, degassing continued at Tungurahua with occasional explosions of steam, gas, and ash. In the afternoon of 15 March a lahar traveled in the Pampas sector.
Read allWed, 17 Mar 2004, 06:00
Seismic and volcanic activity at Soufrière Hills during 12-19 March increased in comparison to the previous week. Seismicity was dominated by moderate-to-strong tremor beginning around 0300 on 15 March, with five episodes of moderate tremor. The tremor was accompanied by gas-and-ash venting.
Read allWed, 17 Mar 2004, 06:00
During 12-19 March, seismicity was above background levels at Shiveluch, with a large number of shallow earthquakes up to M 2 occurring beneath the volcano. Spasmodic volcanic tremor was also recorded. Based on interpretations of seismic data, ash-and-gas explosions may have produced plumes to a maximum height of 5 km a.s.l.
Read allWed, 17 Mar 2004, 06:00
During 15-23 March, several small-to-medium explosions at Santa María's Santiaguito lava-dome complex produced ash-and-gas plumes to ~1.5 km above the crater. Incandescent avalanches of volcanic material traveled SW from the lava dome. In addition, ash fell in proximal areas.
Read allWed, 17 Mar 2004, 06:00
Eruptive activity, which began at Rabaul caldera's Tavurvur cone in October 2002, ceased on 17 February. During 1-17 February, emissions of "light-to-pale ash clouds" were accompanied by occasional moderate explosions that produced thick ash plumes. The ash plumes rose 1-2 km above the summit and drifted E and NE, resulting in ashfall in Duke of York, Rabaul Town, and other villages.
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