Detailed cartography of Cotopaxi’s 1877 primary lahar deposits obtained by drone-imagery and field surveys in the proximal northern drainage

Andrade, S. Daniel, Saltos, Emilia, Nogales, Valeria, Cruz, Sebastián, Lee, Gareth and Barclay, Jenni (2022) Detailed cartography of Cotopaxi’s 1877 primary lahar deposits obtained by drone-imagery and field surveys in the proximal northern drainage. Remote Sensing, 14 (3). ISSN 2072-4292

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Abstract

Cotopaxi is an active volcano in Ecuador, whose eruptions are characterized by producing destructive primary lahars which represent a major risk for the country. The hazard assessment related to such lahars relies largely on the knowledge of the latest event, which occurred on 26 June 1877, for either scenario definition or simulation calibration. A detailed (1:5000 scale) cartography of the deposits belonging to that eruption has been obtained in the proximal northern drainage of Cotopaxi. The cartography was performed through a combination of geological fieldwork, as well as the analysis and interpretation of high-definition imagery obtained by drone surveys combined with the Structure from Motion technology for image processing. Such imagery included red and green visible bands, and a near-infrared band, which allowed the obtention of NDVI imagery where the primary lahar deposits were identified and cartographed with support of fieldwork data. Both data sources are mutually complementary, and the final cartography would be impossible if any of them were not available. The results obtained represent a significant advance for the level of detail with respect to previous cartographic works. Moreover, they should allow an improved calibration of the new generation of numerical models that simulate lahar flow for hazard assessment at Cotopaxi.

Item Type: Article
Additional Information: The following datasets are freely available online at https://zenodo.org/deposit/5866730 (accessed on 17 November 2021) (doi:10.5281/zenodo.5866730): (1) Drone-NDVI imagery at 25cm/pixel for the four surveyed plains; (2) Geospatial vector layer of the geological fieldwork control points; (3) Geospatial vector layer of the cartographed 1877 deposit contact lines; (4) Geospatial vector layer for the cartographed 1877 deposit polygons. E.S and S.C. were funded by Escuela Politécnica Nacional (Ecuador) through the grant number PIMI 1608 (for S.D.A.). Additionally, V.N. was funded by the UK United Kingdom Research and Innovation (UKRI) Collective Fund using Official Development Assistance (ODA) funding through the UKRI GCRF: Urban Disaster Risk Hub—Tomorrow’s Cities (UKRI grant number NE/S00900/1).
Uncontrolled Keywords: 1877 eruption,cotopaxi volcano,drone-imagery,geological mapping,lahar hazard assessment,primary lahars,earth and planetary sciences(all) ,/dk/atira/pure/subjectarea/asjc/1900
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 17 Feb 2022 12:30
Last Modified: 25 Apr 2022 00:20
URI: https://ueaeprints.uea.ac.uk/id/eprint/83553
DOI: 10.3390/rs14030631

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