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Atacazo

Photo of this volcano
  • Ecuador
  • South America
  • Stratovolcano
  • 320 BCE
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 0.353°S
  • 78.617°W

  • 4463 m
    14642 ft

  • 352021
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Atacazo.

The Global Volcanism Program has no Weekly Reports available for Atacazo.

The Global Volcanism Program has no Bulletin Reports available for Atacazo.

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Eruptive History

There is data available for 4 Holocene eruptive periods.

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
0320 BCE ± 16 years Unknown Confirmed 5 Radiocarbon (uncorrected) Ninahuilca Chico II dome, N6 tephra
2490 BCE ± 40 years Unknown Confirmed 5 Radiocarbon (uncorrected) Ninahuilca Chico I dome , N5 tephra
3490 BCE ± 100 years Unknown Confirmed 4 Radiocarbon (uncorrected) Arenal II dome, N4 tephra
6910 BCE (in or before) Unknown Confirmed 4 Radiocarbon (uncorrected) La Cocha II dome, N3 tephra
Deformation History

There is no Deformation History data available for Atacazo.

Emission History

There is no Emissions History data available for Atacazo.

Photo Gallery

Atacazo stratovolcano, located 20 km south of Quito, is seen here from the west along the road to Guayaquil. The volcano contains a summit caldera that is partially filled by lava domes of Holocene age. Lava domes are also found on the SE flank. The only dated Holocene eruption took place about 2400 years ago, forming the Ninahuilca lava domes, the peaks below the center horizon.

Photo by John Ewert, 1992 (U.S. Geological Survey).
See title for photo information.
The Ninahuilca lava domes, which form the twin forested peaks below the right-center horizon, were created during an eruption about 2400 years ago. Growth of the lava domes within the summit caldera of Atacazo volcano was accompanied by plinian explosive eruptions and pyroclastic flows that traveled 35 km down valleys to the west.

Photo by John Ewert, 1992 (U.S. Geological Survey).
See title for photo information.
GVP Map Holdings

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.


Title: Brazil, Colombia, Ecuador, Panama, Venezuela
Publisher: DMA Aerospace Center
Country: S America
Year: 1981
Series: ONC
Map Type: Navigation
Scale: 1:1,000,000
Map of Brazil, Colombia, Ecuador, Panama, Venezuela
Smithsonian Sample Collections Database

There are no samples for Atacazo in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites