During 23-29 March, seismicity and volcanism continued at Shiveluch. Ash-and-gas plumes were observed from the town of Klyuchi rising to 2.5 km above the lava dome during 25-27 March. According to seismic data, on 23 March short-lived explosive eruptions sent ash-and-gas plumes to 5 km above the dome.
During 27 March-2 April, Popocatépetl emitted small clouds of steam, gas, and generally minor amounts of ash. In addition, episodes of harmonic tremor were recorded. Based on information from the Mexico City MWO, the Washington VAAC reported that on 26 March at 2132 seismicity suggested that an emission may have occurred.
According to a news report, a minor eruption occurred at Miyake-jima on 2 April shortly after 1000. While evacuated residents were visiting the island ash rose about 300 m above the volcano and fell around Miyake-jima.
During 18-24 March, several incandescent lava avalanches were observed traveling down Merapi's flanks, predominately SW to the upstream portions of the Lamat, Sat, and Senowo rivers and partly in a more southerly direction towards Bebeng River. The maximum run-out distance was ~2.5 km. No pyroclastic flows occurred during the report period.
During 27 March-2 April at Kilauea, activity continued at the rootless shields and surface lava flows were visible low on the Pulama pali scarp. On 27 March, just after 0300, a small earthquake beneath the caldera triggered more than 30 minutes of increased tremor and small earthquakes. Sharp deflation at Pu`u `O`o on 28 March accompanied a change in eruptive activity at the cone.
During 23-29 March, seismicity remained above background levels at Karymsky, with about 10 earthquakes occurring per hour. The character of the seismicity indicated that weak ash-and-gas explosions and avalanches probably occurred. Thermal anomalies that were 1-3 pixels large were visible on AVHRR satellite imagery, but ash was not.
During 18-24 March, lava avalanches traveled down Karangetang's flanks. On 23 March at 1115 a thunderous sound from the main crater was followed by lava avalanches down the Kahetang and Batu Awang rivers. During the report period, observers noted a thick plume rising 400 m above the crater rim and a 75-m-high "red reflection" rising above the volcano's summit.
Following almost 3 weeks of ash emissions from Etna's Bocca Nuova crater, around 25 March ash emissions began at Northeast Crater. The emissions appeared to coincide with a series of small earthquakes under the volcano's SE flank the night of 24-25 March. On the 27th and 28th ash from both craters rose in distinct puffs several hundreds of meters above the summit.
Wed, 20 Mar 2002, 06:00
During 20-25 March, several emissions of gas, steam, and ash occurred at Tungurahua. Strombolian activity occurred during the evening of 19 March; volcanic blocks were hurled 200 m and rolled down the volcano's NW flank, ash was emitted, incandescent material was visible, and roaring was heard. Ash fell in the sector of Chacauco.
Read allWed, 20 Mar 2002, 06:00
The level of volcanic activity at Soufrière Hills remained high during 15-22 March. Lava-dome growth continued to be focused on the E side of the summit region. Throughout the report period large (50-70 m high), fast-growing, spines developed on the dome's summit.
Read allWed, 20 Mar 2002, 06:00
A decrease in the level of activity at Shiveluch during 15-22 March led KVERT to reduce the Concern Color Code from Orange ("eruption may occur at anytime") to Yellow ("volcano is restless"). During the week, several gas-and-steam eruption clouds rose 300-1,500 m above the volcano's lava dome. Seismicity included earthquakes with magnitudes less than or equal to 2.2 at depths of 0-9 km, many local shallow seismic signals (from possible avalanches or weak gas-ash explosions), and episodes of weak intermittent volcanic tremor.
Read allWed, 20 Mar 2002, 06:00
Volcanic and seismic activity remained high at Semeru during 11-17 March. Observations on 12, 14, and 17 March revealed that a gray plume rose 300-400 m above the summit. Seismicity was dominated by 444 explosion earthquakes, and there was a decrease in the number of tectonic and deep volcanic earthquakes in comparison to the previous week.
Read allWed, 20 Mar 2002, 06:00
During 20-26 March, Popocatépetl emitted small clouds of steam, gas, and generally minor amounts of ash. In addition, episodes of harmonic tremor were recorded.
Read allWed, 20 Mar 2002, 06:00
During 11-17 March, 69 incandescent lava avalanches were observed traveling down Merapi's flanks, predominately SW to the upstream portions of the Lamat, Sat, and Senowo rivers and partly in a more southerly direction towards Bebeng River. The maximum run-out distance was ~2.5 km. No pyroclastic flows occurred during the report period.
Read allWed, 20 Mar 2002, 06:00
During 20-25 March, the rootless shields remained active at Kilauea and small surface lava flows were visible at the base of the lava fan and on the adjacent coastal flat. Generally, volcanic tremor remained at moderate levels at Pu`u `O`o, and long-period earthquakes and weak tremor continued below Kilauea's caldera. During 21-24 March a small amount of inflation was recorded at Pu`u `O`o, but during most of the report period no deformation was recorded at the volcano.
Read allWed, 20 Mar 2002, 06:00
After about one week of instrument downtime, the seismic station near Karymsky began to operate again. As was the case before the seismic station malfunction, seismicity was above background levels (10 earthquakes per hour). The character of the seismicity indicated that weak ash-and-gas explosions and avalanches possibly occurred.
Read allWed, 20 Mar 2002, 06:00
The emission of pink, lithic ash from Bocca Nuova crater that reportedly began on 9 March continued through 21 March. In addition, voluminous degassing occurred at Northeast Crater and there was minor fumarolic activity at Voragine and Southeast craters. No incandescence was visible at night.
Read allWed, 20 Mar 2002, 06:00
Universidad de Colima reported that as of 23 March volcanism continued at Colima and more small explosion earthquakes were recorded than during the previous week. Incandescent lava avalanches, generated from the fronts of block-lava flows, continued to travel 2-3 km down Colima's S, SW, and W flanks, and also sporadically traveled down the volcano's E flank. Block-lava flows extended 550 m down the SW flank and 2 km down the W flank.
Read allWed, 13 Mar 2002, 06:00
According to IRD-IG, during 4-6 March Strombolian activity at Tungurahua was accompanied by gas emissions that reached 1-2 km above the volcano. Incandescent ejecta rose 50-200 m above the western crater rim, tephra fell around the crater, and blocks rolled down the volcano's upper flanks. On the 5th and 6th small amounts of fine ash fell to the NW in Patate Valley and in Ambato Valley.
Read allWed, 13 Mar 2002, 06:00
According to a news article, INSIVUMEH staff stated that beginning on 11 March volcanic activity increased at Santa María's lava-dome complex, Santiaguito. Until at least 14 March, ash was emitted from nearly constant explosions and fractures opened on the volcano. Ash rose 600-900 m above the volcano and fell in the towns of Retalhuleu (25 km SSE of the volcano) and San Marcos, and in areas that border México.
Read allWed, 13 Mar 2002, 06:00
During 8-15 March, the level of volcanic activity at Soufrière Hills was higher than during the previous week. Activity began to increase on the 8th, remaining at elevated levels for the remainder of the report period. Lava-dome growth continued to be concentrated towards the E, sending rockfalls and small pyroclastic flows to the upper portions of the Tar River Valley.
Read allWed, 13 Mar 2002, 06:00
During 8-15 March, volcanic activity at Shiveluch continued and seismicity decreased, but remained above background levels. The highest rising observed gas-and-steam plume reached a height of 2.5 km above the volcano on the 13th. Seismicity included earthquakes with magnitudes less than or equal to 2.1 at depths of 0-9 km, many local shallow seismic signals (from possible avalanches or weak gas-ash explosions), and episodes of weak intermittent volcanic tremor.
Read allWed, 13 Mar 2002, 06:00
During 6-11 March, Popocatépetl emitted small clouds of steam, gas, and generally minor amounts of ash. In addition, episodes of harmonic tremor were recorded.
Read allWed, 13 Mar 2002, 06:00
During 12-19 March, bright glow was visible over Kilauea emanating from Pu`u `O`o crater and the rootless shield near 665-m elevation. The glow was widely visible in the Puna district. The most intense surface activity at the volcano occurred at the rootless shield.
Read allWed, 13 Mar 2002, 06:00
Monitoring data showed no signs of volcanism at Karymsky during 8-15 March. No seismic data were available due to seismic station malfunction. No thermal anomalies or volcanic plumes were observed on satellite images.
Read allWed, 13 Mar 2002, 06:00
Beginning around 9 March, near continuous, pulsating emissions of lithic ash were erupted from the NW vent of Bocca Nuova crater and an ash plume drifted dozens of km. The source vent of this activity was also the site of deep-seated explosions during the past 6 months. According to the Italy's Volcanoes website, the emissions might be caused by collapses within the conduit, which are thought to have occurred repeatedly following the July-August 2001 eruption.
Read allWed, 13 Mar 2002, 06:00
During 6-13 March, avalanches of incandescent volcanic material continued to flow 2-3 km down Colima's S, SW, and W flanks. Most activity occurred on the S and W flanks, while activity slightly diminished on the SW flank. Block-lava flows extended 320 m down the SW flank and had an estimated volume of 720,000 m3.
Read allWed, 13 Mar 2002, 06:00
Based on reports received from the town of Severo-Kurilsk, KVERT reported a continuation through 16 March of volcanism that began at Chikurachki on 25 January. On the 16th during 0700 to late evening ash fell in Podgorny settlement, ~20 km SE of the volcano. On a reconnaissance helicopter flight during 1100-1300, observers saw constant gas emissions and sustained ash explosions that rose 200 m above the volcano and extended more than 100 km SE.
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