Mud flowed from Dieng's Sileri crater during the night of 20 July, traveling as far as 25 m S of the crater rim. The temperature of the crater on 21 July was 74° C, which had not increased much since last measured. On 22 July the Alert Level at Dieng was raised to 2 (on a scale of 1-4).
Activity decreased at Soputan after an eruption occurred on 18 July. During 21-25 July, incandescent lava on the volcano's W slope gradually cooled and on 22 July volcanic tremor stopped. Ash explosions sporadically occurred, but their density and maximum height decreased.
Based on information from an aircraft report, the Darwin VAAC reported that an ash plume emitted from Semeru rose to ~4.5 km a.s.l. on 31 July at 1120. No ash was visible on satellite imagery.
During 30 July-5 August, moderate emissions of mainly gas, steam, and sometimes ash occurred at Popocatépetl.
Seismicity was above background levels at Kliuchevskoi during 24 July to 1 August. During 24-28 July, 14-17 earthquakes with magnitudes less than 2.1 occurred each day. The number of earthquakes decreased to 9 on 29 July, and 7 on 30 July.
During 30 July- 5 August at Kilauea, surface lava flows were visible on the coastal flat and upslope on the Pulama pali and beginning around 3 August at the Holei pali. Surface lava flowed to within 1.1 km of the sea. Generally, seismicity at Kilauea's summit continued at moderate levels, with 1-2 small low-frequency earthquakes per minute occurring at shallow depths beneath the summit caldera.
During the end of July, heightened seismicity occurred in the eastern area of Etna. Also, vigorous degassing continued at Northeast crater, and less intense degassing occurred at Bocca Nuova crater. Four small earthquakes with magnitudes up to 2.6 occurred on 30 July between the villages of Milo and Zafferana on the volcano's E flank.
During 9-14 July, ash explosions at Dukono produced ash plumes to heights of 800-900 m above the volcano. Ash fell around the towns of Mamuya and Galela. During 15-23 July ash plumes rose to low levels, with a plume reaching ~1 km above the volcano on 22 July.
Wed, 30 Jul 2003, 06:00
Based on information from the Control Tower at Colima airport, the Washington VAAC reported that an emission from Colima on 3 August at 0739 produced a plume to ~7.6 km a.s.l. On 4 August at 0845 a small ash emission occurred that was visible on satellite imagery. The Mexico City MWO reported that the cloud rose to ~ 6 km a.s.l. and drifted W.
Read allWed, 30 Jul 2003, 06:00
During 27-30 July, no seismicity was recorded at Bezymianny and visual observations were not possible due to meteorological clouds obscuring the volcano. A thermal anomaly was visible on satellite imagery on 28, 29, and 31 July, and 1 August. The Concern Color Code remained at Yellow.
Read allWed, 23 Jul 2003, 06:00
According to INGV-CT, the eruption that began at Stromboli on 28 December 2002 ended on 22 July. Strombolian activity occurred almost continuously in July, with spatter often falling outside the rim of Crater 1 (the NE crater). Mainly degassing and sporadic ash emissions occurred at Crater 3 (the SW crater), with Strombolian explosions becoming more common during the second half of July.
Read allWed, 23 Jul 2003, 06:00
A large explosion at Bezymianny on 26 July at 2220 produced an ash plume that rose to a height of ~8 km a.s.l. and drifted W. KVERT raised the Concern Color Code from Green to Red, the highest level.
Read allWed, 23 Jul 2003, 06:00
During 18-25 July, volcanic and seismic activity at Soufrière Hills were at very low levels, with only a few events triggering the seismic network. The pattern of earthquakes during the week indicated that lava-dome growth within the explosion crater had probably restarted, although this could not be confirmed because Soufrière Hills was obscured by low-level meteorological clouds. Sulfur-dioxide flux declined somewhat in comparison to the previous week.
Read allWed, 23 Jul 2003, 06:00
Based on information from INSIVUMEH, the Washington VAAC reported the occurrence of small eruptions at Santa María around 22 July, one of which produced an ash column to ~4.5 km a.s.l. Satellite imagery indicated that the plume from an eruption on 23 July around 0730 drifted W.
Read allWed, 23 Jul 2003, 06:00
During 23-29 July, moderate emissions of mainly gas, steam, and sometimes ash occurred at Popocatépetl. Aerial photography taken on 21 July revealed than an external lava dome was not visible at the bottom of the crater. A significant explosion occurred on 25 July at 2053, throwing incandescent fragments on Popocatépetl's slopes.
Read allWed, 23 Jul 2003, 06:00
Based on an aircraft report, the Darwin VAAC reported that an eruption from Leroboleng on 29 July at 0900 lasted 10 minutes and produced an ash cloud to a height of ~7.3 km a.s.l.
Read allWed, 23 Jul 2003, 06:00
Seismicity was above background levels at Kliuchevskoi, with 6-17 M 1.8-2.4 earthquakes occurring each day at depths of ~30 km and at shallower levels. Gas-and-steam plumes rose to a maximum height of ~1 km above the crater. Kliuchevskoi remained at Concern Color Code Orange.
Read allWed, 23 Jul 2003, 06:00
During 23-28 July at Kilauea, surface lava flows were visible on the coastal flat and upslope on the Pulama pali. No lava flowed into the sea. Generally, seismicity at Kilauea's summit continued at moderate levels, with 1-2 small low-frequency earthquakes per minute occurring at shallow depths beneath the summit caldera.
Read allWed, 23 Jul 2003, 06:00
During 12-14 July, JMA recorded seismic signals at Aso that were associated with five small phreatic eruptions. Around 1400 on 27 July continuous volcanic tremor started. Such activity had not been recorded at Aso since November 1995.
Read allWed, 16 Jul 2003, 06:00
Seismic and volcanic activity were at relatively low levels at Tungurahua during 16-22 July, with emissions of steam and gas forming low-level plumes.
Read allWed, 16 Jul 2003, 06:00
After a lava-dome collapse at Soufrière Hills on 12 July volcanic activity was at relatively high levels until 13 July when it slowly subsided. On the 13th activity had declined to very low levels, then the following morning a sudden vulcanian explosion occurred at the lava dome. Two more explosions occurred during the next 2 days.
Read allWed, 16 Jul 2003, 06:00
High levels of volcanic and seismic activity occurred at Soputan during mid-July. On 17 July at 1900 the Alert Level was raised to 2 (on a scale of 1-4) after incandescence was seen at the lava dome for about a day. Around 1150 the amplitude of volcanic tremor increased and at 1900 an increased level of incandescence was seen.
Read allWed, 16 Jul 2003, 06:00
An ash cloud from Semeru was visible on satellite imagery on 21 July at 2316 extending ~75 km to the WSW.
Read allWed, 16 Jul 2003, 06:00
Rainfall at Reventador during 7-13 July remobilized ash on the volcano's flanks, causing lahars down Montana River. Travel on the Baeza highway was interrupted. Permanent tremor associated with degassing was recorded.
Read allWed, 16 Jul 2003, 06:00
During 16-22 July, moderate emissions of mainly gas and steam occurred at Popocatépetl. On 19 July at 0920 a moderate explosion produced an ash plume that rose ~3 km above the crater. After the event the volcano returned to its previous level of activity characterized by frequent and small steam-and-ash emissions.
Read allWed, 16 Jul 2003, 06:00
Seismicity was above background levels at Kliuchevskoi during 11-18 July. Several earthquakes occurred each day with magnitudes of 1.3-2.2 at depths around 30 km and at shallower levels. Explosions sent ash clouds to a height of ~1 km above the volcano and during 12-16 July ash clouds reached ~2 km above the volcano.
Read allWed, 16 Jul 2003, 06:00
During 16-22 July at Kilauea, surface lava flows were visible on the coastal flat and upslope on the Pulama pali and Paliuli. No lava flowed into the sea. Generally, seismicity at Kilauea's summit continued at moderate levels, with 1-2 small low-frequency earthquakes per minute occurring at shallow depths beneath the summit caldera.
Read allWed, 16 Jul 2003, 06:00
Based on an aircraft report, the Darwin VAAC stated that a thick ash plume was visible above Karangetang at a height of ~7.5 km a.s.l. Ash was not visible on satellite imagery.
Read all
