Megan Lasher and Natalie Thompson Dept. of Geology, Colby College

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Presentation transcript:

Megan Lasher and Natalie Thompson Dept. of Geology, Colby College El Reventador Megan Lasher and Natalie Thompson Dept. of Geology, Colby College

Location: Northern Ecuador Photos courtesy of Google Maps ©

Plate tectonics of the Andes Reventador is located in the northern Andes, which are along the South American tectonic plate, next to the Nazca Plate. http://people.rit.edu/rhrsbi/GalapagosPages/Vulcanism2.html

The Basics Type: Stratovolcano Elevation: 11,683 ft Features: - 4 km.- wide caldera on the eastern side - A dome named “El Copote” - Flank vents - A steam and gas plume in the central cone

Eruptive history 22 times in recorded history, starting in 1541 Most active in the 20th and 21st centuries, with 15 eruptions recorded since 1912 http://www.andes.info.ec/es/actualidad/alerta-amarilla-napo-orellana-sucumb%C3%ADos-ante-reactivaci%C3%B3n-volc%C3%A1n-reventador.html

Eruptive history continued Basal Volcanic Complex Intermediate volcano growth Present-day Volcano Reventador

Eruption descriptions The most recent eruptions have been characterized by: 2002: Pyroclastic flows and major ash clouds accompanied lava flows from the summit and flank vents 2007: Lahars observed in June after ash emissions in May 2008: Categorized as a Strombolian explosion with two lava flows.

2.6 million people within 100km The 2002 eruption caused a layer Hazards 2.6 million people within 100km The 2002 eruption caused a layer of ash 3-5 mm thick The last eruption forced the Trans-Ecuadorian Oil Pipeline to shut down

Andesite/Basaltic Andesite Basalt/Picro-Basalt Dacite Rocks Andesite/Basaltic Andesite Basalt/Picro-Basalt Dacite Pyroclastic flows: black basaltic andesite, olivine, augite, hypersthene, hornblende http://poleshift.ning.com/profiles/blog/show?id=3863141%3ABlogPost%3A707141&page=26

Current Activity Tremors, earthquakes, explosions, steam emissions, incandescent lava flows Tourism Located in the Cayambe Coca Ecological Reserve Cameras and seismometers around El Reventador monitor the frequent seismic activity

Bibliography Smithsonian Institution: Global Volcanism Program, 2013, at http://www.volcano.si.edu/volcano.cfm?vn=352010, (accessed 22 January, 2015) Volcano Discovery, 2014, at http://www.volcanodiscovery.com/ecuador/reventador.html (accessed 22 January, 2015) Oregon State University: Volcano World, 2015, at http://volcano.oregonstate.edu/reventador (accessed 22 January, 2015) Vulkaner, 2014, at http://www.vulkaner.no/v/volcan/latinam/reventador_e.html (accessed 22 January, 2015) Ecuador Travel Guide: The Best of Ecuador, 2001, at http://www.thebestofecuador.com/revtrek.htm (accessed 22 January, 2015) Summit Post, 2006, at http://www.summitpost.org/el-reventador/154247 (accessed 22 January, 2015)