| Country | Ecuador |
| Volcanic Region | Northern Andean Volcanic Arc |
| Landform | Volc Type | Composite | Stratovolcano |
| Last Known Eruption | 320 BCE |
| Coordinates | 0.353°S, 78.617°W |
| Elevation | 4,463 m (14,642 ft) |
| Volcano Number | 352021 |
 Google Earth Placemark with Features
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 Cite Volcano Profile
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The Global Volcanism Program has no Weekly Volcanic Activity Reports available for Atacazo.
The Global Volcanism Program has no Bulletin Reports available for Atacazo.
The Global Volcanism Program has no Weekly Reports available for Atacazo.
The Global Volcanism Program has no Bulletin Reports available for Atacazo.
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There is data available for 4 confirmed eruptive periods.
0320 BCE ± 16 years Confirmed Eruption (Explosive / Effusive) VEI: 5
| Episode 1 | Eruption (Explosive / Effusive) | Ninahuilca Chico II dome, N6 tephra | ||||||||||||||||||||||||||||||||||||||
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| 0320 BCE ± 16 years - Unknown | Evidence from Isotopic: 14C (uncalibrated) | ||||||||||||||||||||||||||||||||||||||
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List of 6 Events for Episode 1 at Ninahuilca Chico II dome, N6 tephra
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2490 BCE ± 40 years Confirmed Eruption (Explosive / Effusive) VEI: 5
| Episode 1 | Eruption (Explosive / Effusive) | Ninahuilca Chico I dome , N5 tephra | ||||||||||||||||||||||||||||||||||||||
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| 2490 BCE ± 40 years - Unknown | Evidence from Isotopic: 14C (uncalibrated) | ||||||||||||||||||||||||||||||||||||||
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List of 6 Events for Episode 1 at Ninahuilca Chico I dome , N5 tephra
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3490 BCE ± 100 years Confirmed Eruption (Explosive / Effusive) VEI: 4
| Episode 1 | Eruption (Explosive / Effusive) | Arenal II dome, N4 tephra | ||||||||||||||||||||||||||||||||||||||
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| 3490 BCE ± 100 years - Unknown | Evidence from Isotopic: 14C (uncalibrated) | ||||||||||||||||||||||||||||||||||||||
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List of 6 Events for Episode 1 at Arenal II dome, N4 tephra
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6910 BCE (in or before) Confirmed Eruption (Explosive / Effusive) VEI: 4
| Episode 1 | Eruption (Explosive / Effusive) | La Cocha II dome, N3 tephra | |||||||||||||||||||||||||||||||||
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| 6910 BCE (in or before) - Unknown | Evidence from Isotopic: 14C (uncalibrated) | |||||||||||||||||||||||||||||||||
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List of 5 Events for Episode 1 at La Cocha II dome, N3 tephra
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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.
Cones |
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| Feature Name | Feature Type | Elevation | Latitude | Longitude |
| Caracha, La | Stratovolcano | |||
Domes |
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| Feature Name | Feature Type | Elevation | Latitude | Longitude |
| Arenal I | Dome | 0° 22' 0.00" S | 78° 41' 0.00" W | |
| Arenal II | Dome | 4280 m | ||
| Cocha I, La | Dome | 3798 m | ||
| Cocha II, La | Dome | 3798 m | ||
| Cuscungo | Dome | |||
| Gallo Cantano | Dome | |||
| Ninahuilca
Minasguilca Chico |
Dome | 3834 m | 0° 22' 16.00" S | 78° 38' 20.00" W |
| Ninahuilca Chico I | Dome | |||
| Ninahuilca Chico II | Dome | |||
| Omoturco | Dome | 3566 m | 0° 24' 0.00" S | 78° 36' 0.00" W |
| Viudita, La | Dome | 3724 m | 0° 25' 0.00" S | 78° 37' 0.00" W |
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. 
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. There are no samples for Atacazo in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.
| Copernicus Browser | The Copernicus Browser replaced the Sentinel Hub Playground browser in 2023, to provide access to Earth observation archives from the Copernicus Data Space Ecosystem, the main distribution platform for data from the EU Copernicus missions. |
| MIROVA | Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity. |
| MODVOLC Thermal Alerts | Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales. |
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WOVOdat
Single Volcano View Temporal Evolution of Unrest Side by Side Volcanoes |
WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
GVMID Data on Volcano Monitoring Infrastructure The Global Volcano Monitoring Infrastructure Database GVMID, is aimed at documenting and improving capabilities of volcano monitoring from the ground and space. GVMID should provide a snapshot and baseline view of the techniques and instrumentation that are in place at various volcanoes, which can be use by volcano observatories as reference to setup new monitoring system or improving networks at a specific volcano. These data will allow identification of what monitoring gaps exist, which can be then targeted by remote sensing infrastructure and future instrument deployments. |
| Volcanic Hazard Maps | The IAVCEI Commission on Volcanic Hazards and Risk has a Volcanic Hazard Maps database designed to serve as a resource for hazard mappers (or other interested parties) to explore how common issues in hazard map development have been addressed at different volcanoes, in different countries, for different hazards, and for different intended audiences. In addition to the comprehensive, searchable Volcanic Hazard Maps Database, this website contains information about diversity of volcanic hazard maps, illustrated using examples from the database. This site is for educational purposes related to volcanic hazard maps. Hazard maps found on this website should not be used for emergency purposes. For the most recent, official hazard map for a particular volcano, please seek out the proper institutional authorities on the matter. |
| EarthScope Consortium SAGE seismic stations/networks | EarthScope Consortium operates the NSF Geodetic Facility for the Advancement of Geoscience (GAGE) and NSF Seismological Facility for the Advancement of Geoscience (SAGE). The linked map shows the location of seismic stations from all available networks (permanent or temporary) within a radius of 0.18° (about 20 km at mid-latitudes) from the given location of Atacazo. Users can customize a variety of filters and options in the left panel. Note that if there are no stations are known the map will default to show the entire world with a "No data matched request" error notice. |
| Large Eruptions of Atacazo | Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA). |
| EarthChem | EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS). |
