Chaitén volcano (Chile), activity update: continuing strong ash eruptions, pyroclastic flows
Thursday May 15, 2008 10:03 AM |
Chaitén volcano continues to erupt strong ash plumes although none during the past weeks reached the intensity of the large explosion on May 2nd. Based on observations of satellite imagery, SIGMET reports, and pilot reports, the Buenos Aires VAAC reported that during 7-13 May ash plumes from Chaitén were continuously present and during 7-9 May rose to altitudes of 6.1-10.1 km (20,000-33,000 ft) a.s.l. The plumes drifted E and NE.
SERNAGEOMIN reported that on 7 May, seismicity from Chaitén increased and a large explosion was registered. On 8 May small pyroclastic flows traveled E and contacted the Rayas River, possibly causing steam plumes. During a break in the cloud cover, the ash-and-gas plume, present since 2 May, was seen rising to an altitude of 15.1 km (50,000ft) a.s.l. and drifting NE. The W side of the plume was darker and denser. ONEMI (Oficina Nacional de emergencia - Ministerio del Interior) reported ashfall in multiple areas on 7, 8, and 10 May.
On 12 May, the plume rose to an altitude of 8 km (26,200 ft) a.s.l. During an overflight conducted by SERNAGEOMIN, four more plumes of a similar altitude were generated by explosions and drifted NE. Several hectares of burned vegetation, likely from pyroclastic flows or lateral explosions, were noted on the N flank of the dome. Small pyroclastic flows may also have been responsible for completely burned forest to areas in the NE, and on the W and NW dome flanks. A lahar caused the banks of the Chaitén River to overflow about 200 m on each side, damaging about 40 houses and numerous cars that were partially or fully submerged. During an overflight on 13 May, evidence of pyroclastic flows on the N flank was observed. An ash-and-gas plume emitted from the lava dome drifted NE. The Alert Level remained at
Koppelingen / Bronnen:
Koppelingen / Bronnen:
- SI/USGS Weekly Volcanic Activity Report 7-13 May 2008
Thursday, May 08, 2008
This is a summary of the eruption events at Chaitén volcano: ... [meer...]
Saturday, May 03, 2008
The until now rather unknown Chilenean Chaitén volcano erupted violently on 2 May. Chaiten is a small, glacier-free caldera with a lava dome located 10 km NE of the town of Chaitén on the Gulf of Corcovado. There were no known historic eruptions and its last activity might go back several thousands of years. [meer...]