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Volume estimation of the 1998 flank collapse at Casita volcano, Nicaragua: a comparison of photogrammetric and conventional techniques
Author(s) -
Kerle Norman
Publication year - 2002
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.351
Subject(s) - photogrammetry , geology , digital elevation model , volume (thermodynamics) , volcano , flank , magnitude (astronomy) , range (aeronautics) , remote sensing , geodesy , seismology , engineering , physics , quantum mechanics , astronomy , aerospace engineering , sociology , anthropology
In October 1998 a precipitation‐triggered flank collapse occurred at Casita volcano, Nicaragua, leading to a devastating lahar. In this paper the failure volume was calculated using a range of methods. Several pre‐ and post‐failure digital elevation models (DEMs) were created, based on photogrammetric, cartometric and surveying data. The wide range in resulting volumes prompted an assessment of the accuracies and potential problems associated with each of the datasets and techniques used. The best estimate for the failure volume is 1·6 × 10 6 m 3 . It is based on a vegetation‐corrected pre‐failure DEM, generated using automated digital photogrammetry, and a post‐failure surface based on a field survey carried out with a Total Station. The volume figure is approximately an order of magnitude higher than values reported in previous publications, all of which are based solely on field estimates. This demonstrates that values reported in the literature, if they are not based on rigorous quantitative analysis, must be regarded with caution. Copyright © 2002 John Wiley & Sons, Ltd.