Tag Archives: Anatahan

During 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. … Continue reading →

The 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 … Continue reading →

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. Sources: Emergency Management Office of the Commonwealth of the … Continue reading →

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 … Continue reading →

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 … Continue reading →

The 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 … Continue reading →

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 … Continue reading →

The 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 … Continue reading →

The 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 … Continue reading →

Low-level tremor at Anatahan continued during 21-29 December. On 31 December, the Washington VAAC reported that a gas-and-steam plume with low ash content was visible on satellite imagery and drifted NW. The Volcanic Alert Level remained at Advisory and the … Continue reading →