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Report on Sangay (Ecuador) — January 2009


Bulletin of the Global Volcanism Network, vol. 34, no. 1 (January 2009)
Managing Editor: Richard Wunderman.

Sangay (Ecuador) Thermal anomalies and a minor ash plume during 2008

Please cite this report as:

Global Volcanism Program, 2009. Report on Sangay (Ecuador) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 34:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN200901-352090



2.005°S, 78.341°W; summit elev. 5286 m

All times are local (unless otherwise noted)

Ash plumes were reported between October 2006 and December 2007 (BGVN 33:03). Thermal anomalies have been detected between 27 March and 4 December 2008 (table 2). A minor ash plume was seen on satellite imagery and by pilots drifting WNW on 24 September 2008.

Table 2. Thermal anomalies at Sangay based on MODIS-MODVOLC imaging during 1 January to 19 October 2008 (continued from the list in BGVN 33:03). No thermal anomalies were noted in 2008 prior to 27 March. Courtesy of Hawai'i Institute of Geophysics and Planetology (HIGP) Thermal Alerts System.

Date (UTC) Time (UTC) Pixels Satellite
27 Mar 2008 0320 1 Terra
08 Apr 2008 0345 1 Terra
26 Sep 2008 0325 1 Terra
26 Sep 2008 0625 1 Aqua
28 Sep 2008 1535 1 Terra
03 Oct 2008 0630 1 Aqua
05 Oct 2008 0320 1 Terra
15 Oct 2008 0355 1 Terra
15 Oct 2008 0655 1 Aqua
19 Oct 2008 0330 2 Terra
13 Nov 2008 0325 1 Terra
18 Nov 2008 0345 1 Terra
18 Nov 2008 0645 1 Aqua
04 Dec 2008 0345 1 Terra

Geological Summary. The isolated Sangay volcano, located east of the Andean crest, is the southernmost of Ecuador's volcanoes and its most active. The steep-sided, glacier-covered, dominantly andesitic volcano grew within horseshoe-shaped calderas of two previous edifices, which were destroyed by collapse to the east, producing large debris avalanches that reached the Amazonian lowlands. The modern edifice dates back to at least 14,000 years ago. It towers above the tropical jungle on the east side; on the other sides flat plains of ash have been sculpted by heavy rains into steep-walled canyons up to 600 m deep. The earliest report of a historical eruption was in 1628. More or less continuous eruptions were reported from 1728 until 1916, and again from 1934 to the present. The almost constant activity has caused frequent changes to the morphology of the summit crater complex.

Information Contacts: Washington Volcanic Ash Advisory Center, Satellite Analysis Branch (SAB), NOAA/NESDIS E/SP23, NOAA Science Center Room 401, 5200 Auth Rd, Camp Springs, MD 20746, USA (URL: http://www.ospo.noaa.gov/Products/atmosphere/vaac/); Hawai'i Institute of Geophysics and Planetology (HIGP) Thermal Alerts System, School of Ocean and Earth Science and Technology (SOEST), University of Hawai'i, 2525 Correa Road, Honolulu, HI 96822, USA (URL: http://modis.higp.hawaii.edu/).