Wed, 1 Oct 2008, 06:00
On 1 October, the Volcanic Alert Level for Anatahan was lowered to Normal and the Aviation Color Code to Green. Seismicity remained low and there were no recent reports of significant plumes.
Wed, 6 Aug 2008, 06:00During 7-8 August, small sulfur dioxide plumes from Anatahan were visible on satellite imagery. On 8 August, seismicity decreased significantly. During 8-9 August, steam plumes with small amounts of ash rose to an altitude of 1.8 km (6,000 ft) a.s.l.
Wed, 30 Jul 2008, 06:00
During 30 July-5 August seismic tremor from Anatahan fluctuated. Gas-and-steam plumes possibly containing some ash were occasionally visible on satellite imagery at an altitude of 1.5 km (5,000 ft) a.s.l. and below.
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Wed, 23 Jul 2008, 06:00The USGS reported that seismic tremor from Anatahan slowly increased during 16-26 July. A diffuse sulfur-dioxide plume drifted W on 17 July. According to a Washington VAAC report a low-level plume possibly containing ash drifted 50 km NW on 26 July.
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Wed, 26 Mar 2008, 06:00
The USGS reported that seismicity at Anatahan decreased during 26-31 March. The Volcanic Alert Level was lowered to Advisory and the Aviation Color Code was lowered to Yellow on 31 March.
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Wed, 19 Mar 2008, 06:00The USGS reported that seismicity at Anatahan remained elevated during 19-25 March. Based on observations of satellite imagery, the Washington VAAC reported that diffuse gas-and-ash plumes drifted SW, NE, and E during 19-22 March. The Volcanic Alert Level remained at Watch and the Aviation Color Code remained at Orange.
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Wed, 12 Mar 2008, 06:00
The USGS reported that elevated seismicity at Anatahan continued during 12-13 March, then dropped to near background levels on 14 and 15 March. Based on observations of satellite imagery, the Washington VAAC reported that an ash plume was spotted around the summit area on 13 March and later that day drifted W and NNE. On 15 March, a possible diffuse ash plume was visible on satellite imagery drifting W.
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Wed, 5 Mar 2008, 06:00The USGS reported that levels of seismicity at Anatahan were elevated during 5-10 March, but decreased significantly on 11 March. On 5 March, diffuse ash plumes drifted as far as 120 km NW and 95 km SE. During 5-7 March, continuous ash emissions produced plumes that rose to altitudes less than 3 km (10,000 ft) a.s.l. and drifted NE, SW, and W.
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Wed, 27 Feb 2008, 06:00
The USGS reported that levels of seismicity at Anatahan were elevated during 27 February-4 March. During 27-29 February emissions of sulfur dioxide were detected by the satellite-based Ozone Monitoring Instrument (OMI). Based on observations of satellite imagery, the Washington VAAC reported that an ash plume drifted SSW on 28 February.
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Thu, 21 Feb 2008, 11:35The USGS reported a diffuse plumes from Anatahan and a increasing seismicity that was followed by new ash and steam plumes in the time of 17-20 February.
Wed, 20 Feb 2008, 18:08
Seismic tremor levels at Anatahan were relatively low during 8-13 February. On 9 February, a diffuse steam plume that contained ash was observed . The Volcanic Alert Level remained at Orange.
Wed, 20 Feb 2008, 06:00The USGS reported that emissions of sulfur dioxide from Anatahan were detected by the satellite-based Ozone Monitoring Instrument (OMI) during 20-25 February. Seismicity was elevated during 20-26 February, though levels varied greatly during 23-25 February. The Washington VAAC reported that plumes possibly containing some ash were visible on satellite imagery drifting WSW, SW, E, W, and SE during 20 and 23-24 February.
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Wed, 13 Feb 2008, 06:00
The USGS reported a diffuse plume from Anatahan, possibly containing some ash, was visible on satellite imagery drifting SW on 14 February. On 17 and 19 February seismicity increased. On 18 February, both a low-level steam plume that possibly contained ash and a sulfur dioxide plume were visible on satellite imagery drifting SW.
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Fri, 8 Feb 2008, 21:18The USGS reported elevated seismic tremor levels at Anatahan the last week in January until 5 February. The lake in the E crater has disappeared, and steam and sulfur dioxide plumes drifted generally W and SW. An ash plume rose to an estimated altitude of below 2.3 km and drifted W. The Volcanic Alert Level was raised to Watch and the Aviation Color Code was raised to Orange.
Wed, 6 Feb 2008, 16:43
There is a increased seismic level reported from Anatahan volcano on January 23 and on January 20-28 there was a sulfur dioxide plume. The volcanic alert level stays at Aviation Color Code at yellow.
Wed, 6 Feb 2008, 06:00The USGS reported that seismic tremor levels at Anatahan were relatively low during 8-13 February, except for short-lived increases during 8-9 and 12-13 February. On 9 February, a diffuse steam plume that possibly contained ash was observed on satellite imagery and drifted W. The Washington VAAC reported that more steam plumes possibly containing some ash were visible on satellite imagery on 11, 12, and 13 February and drifted NW and SE.
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Wed, 30 Jan 2008, 06:00
The USGS reported that elevated seismic tremor levels at Anatahan were detected during the last week in January through 5 February. Observations of satellite imagery showed that the lake in the E crater had disappeared, and steam and sulfur dioxide plumes drifted generally W and SW. On 3 February, an ash plume rose to an estimated altitude of below 2.3 km (7,500 ft) a.s.l. and drifted W.
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Wed, 23 Jan 2008, 06:00The USGS reported that elevated seismic tremor levels at Anatahan detected on 16 January were sustained through 23 January and episodic during 23-28 January. During 20-28 January, a sulfur dioxide plume was detected by the satellite-based Ozone Monitoring Instrument (OMI) and drifted W and SW. A steam plume was also detected on satellite imagery.
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Wed, 16 Jan 2008, 06:00
The USGS reported that on several days during 12-20 January, sulfur dioxide plumes from Anatahan were detected by the satellite-based Ozone Monitoring Instrument (OMI). Seismic tremor increased on 16 January and remained elevated on 20 January. The Volcanic Alert Level remained at Advisory and the Aviation Color Code remained at Yellow.
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Wed, 2 Jan 2008, 06:00The USGS reported that during 29 December-5 January 2008, low-level steaming and sulfur dioxide emission from Anatahan were visible on satellite imagery. Seismicity briefly increased on 2 January and then diminished. A report suggested that the lake level in the E crater had been dropping since September.
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