Wed, 28 Jan 2004, 06:00
Volcanism at Soufrière Hills remained at very low levels during 23-30 January. The seismic network recorded 8 rockfalls, 10 hybrid earthquakes, 1 volcano-tectonic earthquake, and 1 long-period earthquake. Sulfur-dioxide emissions were between 500 and 700 tons per day (no measurements were possible on 24 and 25 January).
Wed, 28 Jan 2004, 06:00During 23-30 January, seismicity was above background levels at Shiveluch, with a large number of weak shallow earthquakes occurring at depths of 0-5 km beneath the lava dome. In addition, 5-7 shallow M 1.75-2.3 earthquakes occurred each day except for 22 January. Intermittent tremor was recorded all week.
Wed, 28 Jan 2004, 06:00
During 28 January to 2 February, small-to-moderate explosions occurred at Santa María's Santiaguito lava-dome complex. During 31 January to 2 February, collapses occurred at the SW edge of the lava dome within Caliente cone. Ash plumes were produced that rose to ~1 km above the lava dome, as well as small avalanches of volcanic blocks and ash.
Wed, 28 Jan 2004, 06:00During 23-30 January, seismicity was above background levels at Kliuchevskoi, with ~130 shallow M 1.9-2.3 earthquakes and a large number of weaker events occurring. Probable Strombolian activity was seen at the volcano on the evenings of 24 and 26 January. Gas-and-steam plumes rose to ~3 km above the volcano.
Wed, 28 Jan 2004, 06:00
During 29 January to 1 February mild volcanic activity occurred at Kilauea, with incandescence visible at vents in Pu`u `O`o's crater and small surface flows on the central or southern part of the rootless shield complex, an area ~0.5 km SW of Pu`u `O`o. Starting on 18 January, when the MLK vent formed, the distance across the summit caldera decreased significantly, ending a period of increasing extension rate since the Mother's Day event in May 2002. During the report period, weak tremor occurred at Kilauea's summit along with a few long-period earthquakes.
Wed, 28 Jan 2004, 06:00During 23-30 January, seismicity was above background levels at Karymsky, with 50-150 shallow earthquakes occurring daily. Gas-and-steam explosions produced plumes that rose to ~1 km above the volcano. Karymsky remained at Concern Color Code Orange.
Wed, 28 Jan 2004, 06:00
During 28 January to 2 February, small-to-moderate explosions occurred at Fuego. The highest rising ash plume was produced from an explosion on 29 January. The plume reached ~1.1 km above the crater and was accompanied by avalanches of volcanic material down Barranca Seca.
Wed, 28 Jan 2004, 06:00During January, an average of three explosions per day occurred at Colima. The resultant ash plumes rose 2-3 km above the crater and mostly drifted NE and ENE.
Wed, 21 Jan 2004, 06:00
During 21-26 January, Tungurahua continued to emit gas, steam, and ash. Emissions rose to ~1 km above the crater, with variable amounts of ash in the resultant plumes. On 22 January at 0626 an explosion sent a plume to ~2 km above the volcano.
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Wed, 21 Jan 2004, 06:00Based on information from the Japanese Meteorological Agency, the Tokyo VAAC reported that explosions at Suwanose-jima on 21 and 22 January produced ash plumes to unknown heights.
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Wed, 21 Jan 2004, 06:00
Activity at Soufrière Hills remained at low levels during 16-23 January, although there was a slight increase in seismic activity. The seismic network recorded 1 rockfall, 1 volcano-tectonic earthquake, and 38 long-period and 9 hybrid earthquakes. An unusual seismic event began on 18 January around 0600, consisting of a low-amplitude swarm of long-period earthquakes.
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Wed, 21 Jan 2004, 06:00Volcanic activity remained at relatively high levels at Shiveluch during 16-23 January. Several explosions occurred, producing ash plumes that rose to a maximum height of 6 km a.s.l. Ash explosions on 21 January were accompanied by pyroclastic flows with run-out distances of ~ 2 km.
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Wed, 21 Jan 2004, 06:00
During 21-27 January, weak-to-moderate explosions continued at Santa Maria's Santiaguito lava-dome complex. Avalanches of blocks of lava and ash descended the S and SW flanks of Caliente dome and explosions produced low-level ash plumes.
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Wed, 21 Jan 2004, 06:00Satellite imagery on 27 January showed a narrow ash plume emitted from Sangay that was at a height of ~6 km a.s.l. and drifting SW.
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Wed, 21 Jan 2004, 06:00
Seismicity was above background levels at Kliuchevskoi during 16-23 January, with ~130 shallow M 1.9-2.3 earthquakes and a large number of weaker events recorded. Ash explosions produced low-level plumes on 15 January that drifted NW. According to the Tokyo VAAC, an eruption on 24 January produced an ash plume to ~2.7 km a.s.l.
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Wed, 21 Jan 2004, 06:00On 22 January lava was emitted from the vent that formed at Kilauea on 19 January (the vent and lava flow S of Pu`u `O`o cone were named MLK in honor of the activity that began on Martin Luther King Jr.'s birthday). There were also surface lava flows at the W side of the Amalgamated Bend shield SW of Pu`u `O`o. By 26 January there were no surface lava flows at the MLK vent, and incandescence was only visible at the S part of the rootless shield complex.
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Wed, 21 Jan 2004, 06:00
During 16-23 January, seismicity was above background levels at Karymsky, with 200-300 shallow earthquakes occurring per day. Possible ash-and-gas explosions produced plumes that rose to 3 km above the volcano. Karymsky remained at Concern Color Code Orange.
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Wed, 21 Jan 2004, 06:00On the evening of 22 January two strong explosions at Fuego sent incandescent avalanches a maximum distance of 1 km toward Zanjón Barranca Seca, La Trinidad, and Río Ceniza ravines. The resultant plume rose ~1.5 km above the crater and drifted SSW. No ash fell in populated regions.
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Wed, 21 Jan 2004, 06:00
During 21-27 January, INETER continued to monitor seismicity at Cerro Negro. According to a news article, observers near the volcano reported ash clouds rising above the volcano, but scientists observing Cerro Negro on 19 January saw only gas emanating from cracks and fumaroles, casting doubt on the ash-cloud observations.
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Wed, 21 Jan 2004, 06:00During 16-23 January, following an eruption on the 14th, a lava dome continued to grow at Bezymianny, with viscous lava probably flowing from it. Precise seismic monitoring was hampered due to high-level volcanic tremor at nearby Kliuchevskoi volcano. On 22 January a gas-and-steam plume rose 3.5 km a.s.l. and extended NE.
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Wed, 14 Jan 2004, 06:00
During 14-19 January, Tungurahua continued to emit gas, steam, and ash. Emissions rose to ~1 km above the crater and drifted predominately N and NE, with variable amounts of ash in the resultant plumes. In addition, low-level seismicity occurred.
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Wed, 14 Jan 2004, 06:00During 11-12 January, explosions at Shiveluch produced ash plumes to 4 km a.s.l. that drifted W. The explosions were accompanied by pyroclastic flows with run-out distances around 1 km.
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Wed, 14 Jan 2004, 06:00
According to the Washington VAAC, satellite imagery showed a plume emitted from Sangay on 14 January around 0500 extendeding ~45 km E. The plume most likely contained ash. During this time a hotspot was also visible on satellite imagery.
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Wed, 14 Jan 2004, 06:00Seismicity increased from "normal" levels at Kirishima on 13 December, and the same day Dr. Kobayashi of Kagoshima University found new fumarole pits at the volcano's Ohachi Crater. A video camera at the volcano showed steam rising above the crater rim.
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Wed, 14 Jan 2004, 06:00
According to INETER, an unusually large amount of seismic tremor occurred at Cerro Negro from December 2003 to at least mid January. The tremor had variable intensity, but was too small to be felt by the population near the volcano. During visits to Cerro Negro on 6 and 10 January, scientists did not observe any surficial changes or measure a temperature increase at fumaroles in comparison to previous months.
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Wed, 14 Jan 2004, 06:00Video footage showed a strong explosion at Bezymianny on 14 January at 1053 producing an ash plume that rose to 6-8 km a.s.l. and extended ENE. A large pyroclastic flow probably traveled SSE down the volcano's flank.
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Wed, 14 Jan 2004, 06:00
According to the Japanese Meteorological Agency, a "mud eruption" occurred at Aso's Crater 1 on 14 January at 1541. The eruption was accompanied by volcanic tremor and ash emissions that rose to low levels above the crater. Small amounts of very fine ash fell in Takamori Town about 10 km ESE of the crater.
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Wed, 14 Jan 2004, 06:00Volcanic activity at Soufrière Hills remained at low levels during 9-16 January. The seismic network recorded 5 rockfalls and 1 long-period and 18 hybrid earthquakes. The sulfur-dioxide flux from the volcano was low at the beginning of the report period (less than 200 tons per day), increasing to around 350 tons per day after a minor ash-venting event on 9 January.
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