Mount Erebus

Mount Erebus
Richard Waitt, U.S. Geological Survey · Public domain · source
Name	Mount Erebus
Elevation m	3794
Location	Ross Island, Ross Sea, Antarctica
Range	Ross Island volcanoes
Type	Stratovolcano/shield with phonolite lava
First ascent	1908 (Ernest Shackleton expedition)

Mount Erebus is the second-highest volcano in Antarctica and the southernmost active volcano on Earth. Located on Ross Island near the Ross Ice Shelf, it hosts one of the few persistent convecting lava lakes and has been a focal point for research by national programs including the United States Antarctic Program, New Zealand Antarctic Programme, and the Australian Antarctic Division. The peak has historical significance for exploration by the British Antarctic Expedition (1907–09), Nimrod Expedition, and later scientific campaigns linked to the International Geophysical Year.

Geology and Volcanology

Erebus is a complex stratovolcano built on older shield volcano foundations of Ross Island volcanoes and overlies crust affected by the West Antarctic Rift System. Its magmatic products are dominated by alkaline, silica-undersaturated phonolitic melts and abundant xenoliths derived from the lower crust and upper mantle, evidence interpreted through petrology studies involving institutions such as the Victoria University of Wellington and the United States Geological Survey. The volcano’s plumbing includes a shallow conduit feeding a long-lived lava lake; geophysical surveys by teams from Scripps Institution of Oceanography and the University of Washington have used seismic tomography and magnetotellurics to image melt zones beneath the edifice. Tectonic context ties Erebus to the McMurdo Volcanic Group and to rifting processes associated with the Transantarctic Mountains.

Eruptive History

Erebus has exhibited a protracted history of both effusive and explosive activity documented since discovery during the Ross Expedition (1839–1843) and through systematic observations by 20th- and 21st-century programs. Historic explosive episodes produced phonolitic tephra dispersed locally across Ross Island and into the McMurdo Sound region, recorded in stratigraphic studies alongside deposits correlated with eruptions at Hut Point Peninsula and other local vents. Modern activity since the mid-20th century features Strombolian eruptions, degassing, and persistent lava-lake convection; monitoring efforts by the New Zealand Antarctic Research Programme and the United States Antarctic Program have documented gas emissions dominated by carbon dioxide and sulfur dioxide, with episodic ash emissions that impacted operations at McMurdo Station and raised concerns for aviation near Williams Field and Scott Base.

Glaciation and Ice Features

The summit region interacts directly with the polar cryosphere: cold-based and temperate glaciers on Ross Island, including outlet flow toward the Ross Ice Shelf, modulate erosion and produce ice-mantled fumarolic zones. Persistent low-temperature snowpack, wind scouring from the Southern Ocean-derived katabatic flows, and radiative regimes maintain snowfields and englacial cavities; researchers from the Scott Polar Research Institute and Ohio State University have investigated ice caves and fumarole-related ice pinnacles. Ice-impacted tephra layers provide a link between volcanic episodes and paleoclimate archives used by teams associated with the Wegener Institute and the British Antarctic Survey.

Ecology and Climate

Erebus lies within a hyperpolar desert influenced by the Antarctic Circumpolar Current and has an extreme cold, dry climate that constrains life to specialized niches. Microbial communities, chemosynthetic assemblages, and extremophile taxa colonize fumarolic soils and warmed substrates; ecological studies by the University of Canterbury, University of Colorado, and the National Science Foundation’s funded projects documented thermophilic bacteria and cryptogamic mats. Avifauna such as Adélie penguin colonies and transient skua populations occupy coastal zones of Ross Island, while seal species including Weddell seal occur in adjacent sea-ice habitats monitored by researchers from the University of Tasmania and the British Antarctic Survey.

Human Exploration and Research

Erebus attracted early explorers like James Clark Ross and later parties led by Ernest Shackleton and Robert Falcon Scott; scientific activity expanded with permanent support from bases including McMurdo Station and Scott Base. Field programs have included volcanology, geochemistry, seismology, and atmospheric chemistry conducted by universities such as Rutgers University, Pennsylvania State University, and the University of Alaska Fairbanks, and by agencies like the National Aeronautics and Space Administration for remote sensing campaigns. Notable incidents include the Air New Zealand Flight 901 crash in the vicinity of the Ross Island region, prompting search-and-rescue, legal, and safety developments involving Civil Aviation Authority of New Zealand. Long-term international collaborations continue under logistic frameworks of the Council of Managers of National Antarctic Programs.

Hazards and Monitoring

Hazards from Erebus include volcanic gas emissions, lava bombs, ballistic projectiles, ashfall affecting McMurdo Station and aviation infrastructure such as Pegasus Field, and localized lahars where meltwater interacts with tephra and ice. Monitoring networks employ seismic stations, infrasound arrays, gas spectrometers, infrared cameras, and satellite remote sensing by platforms associated with European Space Agency and National Oceanic and Atmospheric Administration to track unrest. Emergency planning integrates operators from Air New Zealand, national Antarctic programs, and research stations to mitigate risks to field parties, aircraft, and scientific installations on Ross Island.

Category:Volcanoes of Ross Island Category:Active volcanoes Category:Antarctic geography