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Downstream aggradation owing to lava dome extrusion and rainfall runoff at Volcán Santiaguito, Guatemala

Persistent lava extrusion at the Santiaguito dome complex (Guatemala) results in continuous lahar activity and river bed aggradation downstream of the volcano. We present a simple method that uses vegetation indices extracted from Landsat Thematic Mapper (TM) data to map impacted zones. Application of this technique to a time series of 21 TM images acquired between 1987 and 2000 allow us to map, measure, and track temporal and spatial variations in the area of lahar impact and river aggradation. Harris, A.J.L., Vallance, J.W., Kimberly, P., Rose, W.I., Matías, O., Bunzendahl, E., Flynn, L.P., and Garbeil, H., 2006, Downstream aggradation owing to lava dome extrusion and rainfall runoff at Volcán Santiaguito, Guatemala, in Rose, W.I., Bluth, G.J.S., Carr, M.J., Ewert, J.W., Patino, L.C., and Vallance, J.W., Volcanic hazards in Central America: Geological Society of America Special Paper 412, p. 85–104, doi: 10.1130/2006.2412(05). For permission to copy, contact editing@ geosociety.org. ©2006 Geological Society of America. All rights reserved. *E-mail: harris@higp.hawaii.edu