The Global Volcanism Program has no activity reports available for Ascensión.
The Global Volcanism Program has no Weekly Reports available for Ascensión.
The Global Volcanism Program has no Bulletin Reports available for Ascensión.
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 |
| Cat Hill | Cone - Crater | 85 m | ||
| Crater Cliff | Cone | 57 m | ||
| Hayes Hill | Cone | 32 m | ||
| Lady Hill | Cone | 360 m | ||
| Mountain Red Hill | Cone | 544 m | ||
| Perfect Crater | Pyroclastic cone | 311 m | ||
| Round Hill | Cone | 137 m | ||
| Sisters Peak | Cone | 445 m | ||
| Sisters Red Hill | Cone | 276 m | ||
| South Gannet Hill | Cone | 228 m | ||
| South Red Crater | Pyroclastic cone | 166 m | ||
| Southwest Red Hill | Pyroclastic cone | 223 m | ||
| Spoon Crater | Cone - Crater | 362 m | ||
| The Peak | Pyroclastic cone | 858 m | ||
| Thistle Hill | Cone | 329 m | ||
| Travellers Hill | Cone | 357 m | ||
Craters |
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| Feature Name | Feature Type | Elevation | Latitude | Longitude |
| Butt Crater | Crater - Cone | 226 m | ||
| Dark Slope | Crater - Cone | 233 m | ||
| Devils Cauldron | Caldera | 457 m | ||
| East Crater | Crater - Cone | 226 m | ||
| Green Top Crater | Crater | |||
| Hollands Crater | Crater - Cone | 199 m | ||
| Horseshoe Crater | Crater - Cone | 120 m | ||
| Saddle Crater | Crater - Cone | 129 m | ||
| Southeast Crater | Crater - Cone | 1146 m | ||
| Street Crater | Crater - Cone | 240 m | ||
| Table Crater | Crater - Cone | 195 m | ||
| Upper Valley Crater | Crater - Cone | 245 m | ||
Domes |
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| Feature Name | Feature Type | Elevation | Latitude | Longitude |
| Bears Back | Dome | 241 m | ||
| Boatswain Bird Islet | Dome | 98 m | ||
| Cross Hill | Dome | 265 m | ||
| Green Mountain | Dome | 759 m | ||
| Little White Hill | Dome | 168 m | ||
| Ragged Hill | Dome | 287 m | ||
| Riding School | Dome | 244 m | ||
| Weather Post | Dome | 607 m | ||
| White Hill | Dome | 525 m | ||
| Wig Hill | Dome | 145 m | ||
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There is data available for 3 confirmed Holocene eruptive periods.
1508 ± 180 years Confirmed Eruption VEI: 0
| Episode 1 | Eruption | South Sisters lava flow | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1508 ± 180 years - Unknown | Evidence from Isotopic: Ar/Ar | |||||||||||||||||||
|
List of 2 Events for Episode 1 at South Sisters lava flow
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1468 ± 120 years Confirmed Eruption VEI: 0
| Episode 1 | Eruption | Comfortless Cove lava flow | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1468 ± 120 years - Unknown | Evidence from Isotopic: Ar/Ar | |||||||||||||||||||
|
List of 2 Events for Episode 1 at Comfortless Cove lava flow
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0378 ± 370 years Confirmed Eruption VEI: 0
| Episode 1 | Eruption | Davidson lava flow | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0378 ± 370 years - Unknown | Evidence from Isotopic: Ar/Ar | |||||||||||||||||||
|
List of 2 Events for Episode 1 at Davidson lava flow
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There is no Deformation History data available for Ascensión.
There is no Emissions History data available for Ascensión.
A view to the NW from Green Mountain shows The Sisters (left) and Perfect Crater (right-center), cinder cones on the flanks of the Ascensión Island volcano, which lies just west of the Mid-Atlantic Ridge. The isolated island contains numerous cones and lava domes. Many volcanic features on Ascensión have a very youthful appearance, and three eruptions have been dated within the past 2,000 years, the most recent being the South Sisters flow, possibly only 500 years old.
The surface of the nearly 14-km-wide Ascensión Island is composed of mafic and felsic eruptive products including scoria cones, lava flows, and pyroclastic flow deposits, some of which are seen in this July 2020 Planet Labs satellite image monthly mosaic (N is at the top). The larger, eroded edifice in the SE is Green Mountain with White Hill farther E. Numerous scoria cones with summit craters are visible across the island.Maps are not currently available due to technical issues.
The following 64 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections, and may be availble for research (contact the Rock and Ore Collections Manager). Catalog number links will open a window with more information.
| Catalog Number | Sample Description | Lava Source | Collection Date |
|---|---|---|---|
| NMNH 111123-230 | Obsidian | -- | -- |
| NMNH 111313-1 | Granite | -- | -- |
| NMNH 111313-10 | Granite | -- | -- |
| NMNH 111313-11 | Granite | -- | -- |
| NMNH 111313-12 | Granite | -- | -- |
| NMNH 111313-13 | Granite | -- | -- |
| NMNH 111313-14 | Granite | -- | -- |
| NMNH 111313-15 | Granite | -- | -- |
| NMNH 111313-16 | Granite | -- | -- |
| NMNH 111313-17 | Granite | -- | -- |
| NMNH 111313-18 | Granite | -- | -- |
| NMNH 111313-19 | Granite | -- | -- |
| NMNH 111313-2 | Granite | -- | -- |
| NMNH 111313-20 | Granite | -- | -- |
| NMNH 111313-21 | Granite | -- | -- |
| NMNH 111313-3 | Granite | -- | -- |
| NMNH 111313-4 | Granite | -- | -- |
| NMNH 111313-5 | Granite | -- | -- |
| NMNH 111313-6 | Granite | -- | -- |
| NMNH 111313-7 | Granite | -- | -- |
| NMNH 111313-8 | Granite | -- | -- |
| NMNH 111313-9 | Granite | -- | -- |
| NMNH 112291-1 | Granite | -- | -- |
| NMNH 112292-1 | Fumarole Deposit | -- | -- |
| NMNH 112293-1 | Basalt | -- | -- |
| NMNH 112294-1 | Concretion | -- | -- |
| NMNH 112295-1 | Trachyte (?) | -- | -- |
| NMNH 112296-1 | Basalt | -- | -- |
| NMNH 112297-1 | Trachyte (?) | -- | -- |
| NMNH 112298-1 | Basalt | -- | -- |
| NMNH 112299-1 | Granite (?) | -- | -- |
| NMNH 112300-1 | Basalt | -- | -- |
| NMNH 112302-1 | Gneiss | -- | -- |
| NMNH 112303-1 | Gneiss | -- | -- |
| NMNH 112304-1 | Gneiss | -- | -- |
| NMNH 112305-1 | Gneiss | -- | -- |
| NMNH 112306-1 | Gneiss | -- | -- |
| NMNH 112307-1 | Gneiss | -- | -- |
| NMNH 112308-1 | Gneiss | -- | -- |
| NMNH 112309-1 | Gneiss | -- | -- |
| NMNH 112310-1 | Gneiss | -- | -- |
| NMNH 112311-1 | Basalt (?) | -- | -- |
| NMNH 112312-1 | Gneiss | -- | -- |
| NMNH 112313-1 | Gneiss | -- | -- |
| NMNH 112314-1 | Gneiss | -- | -- |
| NMNH 112315-1 | Gneiss | -- | -- |
| NMNH 112316-1 | Gneiss | -- | -- |
| NMNH 112317-1 | Gneiss | -- | -- |
| NMNH 112318-1 | Basalt | -- | -- |
| NMNH 112319-1 | Basalt | -- | -- |
| NMNH 112320-1 | Granite | -- | -- |
| NMNH 112321-1 | Gneiss (?) | -- | -- |
| NMNH 112322-1 | Welded (?) Tuff | -- | -- |
| NMNH 112323-1 | Basalt | -- | -- |
| NMNH 112324-1 | Granite | -- | -- |
| NMNH 112325-1 | Granite | -- | -- |
| NMNH 113436-1 | Obsidian | -- | -- |
| NMNH 113436-2 | Obsidian | -- | -- |
| NMNH 113436-3 | Obsidian | -- | -- |
| NMNH 113436-4 | Obsidian | -- | -- |
| NMNH 113436-5 | Obsidian | -- | -- |
| NMNH 113436-6 | Obsidian | -- | -- |
| NMNH 116268 | Olivine Basalt | GREEN MT | -- |
| NMNH 36281 | Hyalo-Liparite Obsidian | -- | -- |
| 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. |
| IRIS seismic stations/networks | Incorporated Research Institutions for Seismology (IRIS) Data Services map showing 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 Ascensión. 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. |
| UNAVCO GPS/GNSS stations | Geodetic Data Services map from UNAVCO showing the location of GPS/GNSS stations from all available networks (permanent or temporary) within a radius of 20 km from the given location of Ascensión. Users can customize the data search based on station or network names, location, and time window. Requires Adobe Flash Player. |
| DECADE Data | The DECADE portal, still in the developmental stage, serves as an example of the proposed interoperability between The Smithsonian Institution's Global Volcanism Program, the Mapping Gas Emissions (MaGa) Database, and the EarthChem Geochemical Portal. The Deep Earth Carbon Degassing (DECADE) initiative seeks to use new and established technologies to determine accurate global fluxes of volcanic CO2 to the atmosphere, but installing CO2 monitoring networks on 20 of the world's 150 most actively degassing volcanoes. The group uses related laboratory-based studies (direct gas sampling and analysis, melt inclusions) to provide new data for direct degassing of deep earth carbon to the atmosphere. |
| Large Eruptions of Ascensión | 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). |
