Atacazo

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 0.353°S
  • 78.617°W

  • 4463 m
    14639 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.

Eruptive History


Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).


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

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.

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.

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