Transcript El Reventador 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-orellanasucumb%C3%ADos-ante-reactivaci%C3%B3n-volc%C3%A1nreventador.html
Eruptive history continued
1. Basal Volcanic Complex
2. Intermediate volcano growth
3. 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.
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
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%3A
707141&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)