What gases are emitted by Kīlauea and other active volcanoes?
Ninety-nine percent of the gas molecules emitted during a volcanic eruption are water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2). The remaining one percent is comprised of small amounts of hydrogen sulfide, carbon monoxide, hydrogen chloride, hydrogen fluoride, and other minor gas species.
Learn more: Volcanic Gas
Related Content
Does vog (volcanic smog) impact plants and animals?
Who monitors volcanic gases emitted by Kīlauea and how is it done?
Where and how do sulfur dioxide and volcanic gases (vog) affect air quality in Hawaii?
Should I cancel my plans to visit to Hawai`i Island because of sulfur dioxide (SO2) and vog?
What health hazards are posed by vog (volcanic smog)?
What is "vog"? How is it related to sulfur dioxide (SO2) emissions?
Does ash ever erupt from Kīlauea Volcano?
Why is it important to monitor volcanoes?
How are volcanic gases measured?
Is it dangerous to work on volcanoes? What precautions do scientists take?
Groundwater dynamics at Kīlauea Volcano and vicinity, Hawaiʻi
Kīlauea Volcano, on the Island of Hawaiʻi, is surrounded and permeated by active groundwater systems that interact dynamically with the volcanic system. A generalized conceptual model of Hawaiian hydrogeology includes high-level dike-impounded groundwater, very permeable perched and basal aquifers, and a transition (mixing) zone between freshwater...
Patrick, Matthew R.; Orr, Tim R.; Swanson, Don; Houghton, Bruce F.; Hurwitz, Shaul; Peek, Sara E.; Scholl, Martha A.; Bergfeld, Deborah; Evans, William C.; Kauahikaua, James P.; Gingerich, Stephen B.; Hsieh, Paul A.; Lee, R. Lopaka; Younger, Edward F.; Ingebritsen, Steven E.
Views of a century of activity at Kīlauea Caldera—A visual essay
The 2018 eruption of Kīlauea Volcano marked the end of the first sustained period of volcanic activity at Halemaʻumaʻu Crater in 94 years. The views of the lava lake (informally named “Overlook,” nestled within Halemaʻumaʻu) lasted for a decade and seemed timeless. But as we were recently reminded, the summit of Kīlauea is part of a dynamic system...
Patrick, Matthew R.; Orr, Tim R.; Swanson, Don; Houghton, Bruce F.; Gaddis, Ben; Kauahikaua, James P.
Kīlauea’s 2008–2018 summit lava lake—Chronology and eruption insights
The first eruption at Kīlauea’s summit in 25 years began on March 19, 2008, and persisted for 10 years. The onset of the eruption marked the first explosive activity at the summit since 1924, forming the new “Overlook crater” (as the 2008 summit eruption crater has been informally named) within the existing crater of Halemaʻumaʻu. The first year...
Patrick, Matthew R.; Orr, Tim R.; Swanson, Don; Houghton, Bruce F.; Patrick, Matthew R.; Orr, Tim R.; Swanson, Don; Houghton, Bruce F.; Wooten, Kelly M.; Desmither, Liliana; Parcheta, Carolyn; Fee, David
U.S. Geological Survey 2018 Kīlauea Volcano eruption response in Hawai'i—After-action review
The 2018 Kīlauea Volcano eruption lasted 107 days, and now ranks as the most destructive event at Kilauea since 1790, and as one of the most costly volcanic disasters in U.S. history. Multiple simultaneous hazard events unfolded, including sustained seismic activity leading to collapse at the summit of Halema'uma'u crater and severe damage to the...
Williams, Dee M.; Avery, Vic F.; Coombs, Michelle L.; Cox, Dale A.; Horwitz, Lief R.; McBride, Sara K.; McClymont, Ryan J.; Moran, Seth C.
Preliminary analyses of volcanic hazards at Kīlauea Volcano, Hawai‘i, 2017–2018
From 2017 to 2018, the U.S. Geological Survey (USGS) Hawaiian Volcano Observatory (HVO) responded to ongoing and changing eruptions at Kīlauea Volcano as part of its mission to monitor volcanic processes, issue warnings of dangerous activity, and assess volcanic hazards. To formalize short-term hazards assessments—and, in some cases, issue...
Neal, Christina A.; Anderson, Kyle R.
Volcanic air pollution hazards in Hawaii
Noxious sulfur dioxide gas and other air pollutants emitted from Kīlauea Volcano on the Island of Hawai‘i react with oxygen, atmospheric moisture, and sunlight to produce volcanic smog (vog) and acid rain. Vog can negatively affect human health and agriculture, and acid rain can contaminate household water supplies by leaching metals from building...
Elias, Tamar; Sutton, A. Jeff
One hundred volatile years of volcanic gas studies at the Hawaiian Volcano Observatory
The first volcanic gas studies in Hawai‘i, beginning in 1912, established that volatile emissions from Kīlauea Volcano contained mostly water vapor, in addition to carbon dioxide and sulfur dioxide. This straightforward discovery overturned a popular volatile theory of the day and, in the same action, helped affirm Thomas A. Jaggar, Jr....
Poland, Michael P.; Takahashi, T. Jane; Landowski, Claire M.; Sutton, A.J.; Elias, Tamar
Characteristics of Hawaiian volcanoes
Founded in 1912 at the edge of the caldera of Kīlauea Volcano, HVO was the vision of Thomas A. Jaggar, Jr., a geologist from the Massachusetts Institute of Technology, whose studies of natural disasters around the world had convinced him that systematic, continuous observations of seismic and volcanic activity were needed to better understand—and...
Poland, Michael P.; Takahashi, T. Jane; Landowski, Claire M.
The ongoing Puʻu ʻŌʻō eruption of Kīlauea Volcano, Hawaiʻi: 30 years of eruptive activity
The Puʻu ʻŌʻō eruption of Kīlauea Volcano is its longest rift-zone eruption in more than 500 years. Since the eruption began in 1983, lava flows have buried 48 square miles (125 square kilometers) of land and added about 500 acres (200 hectares) of new land to the Island of Hawaiʻi. The eruption not only challenges local communities, which must...
Orr, Tim R.; Heliker, Christina; Patrick, Matthew R.
Mauna Loa--history, hazards and risk of living with the world's largest volcano
Mauna Loa on the Island Hawaiʻi is the world’s largest volcano. People residing on its flanks face many hazards that come with living on or near an active volcano, including lava flows, explosive eruptions, volcanic smog, damaging earthquakes, and local tsunami (giant seawaves). The County of Hawaiʻi (Island of Hawaiʻi) is the...
Trusdell, Frank A.
Sulfur dioxide emission rates from Kilauea Volcano, Hawaii, 2007-2010
Kīlauea Volcano has one of the longest running volcanic sulfur dioxide (SO2) emission rate databases on record. Sulfur dioxide emission rates from Kīlauea Volcano were first measured by Stoiber and Malone (1975) and have been measured on a regular basis since 1979 (Elias and Sutton, 2007, and references within). Compilations of SO2...
Elias, T.; Sutton, A.J.
Kīlauea - An explosive volcano in Hawai‘i
Kīlauea Volcano on the Island of Hawai‘i, though best known for its frequent quiet eruptions of lava flows, has erupted explosively many times in its history - most recently in 2011. At least six such eruptions in the past 1,500 years sent ash into the jet stream, at the cruising altitudes for today's aircraft. The eruption of 1790...
Swanson, Donald A.; Fiske, Dick; Rose, Tim; Houghton, Bruce F.; Mastin, Larry
The National Volcano Early Warning System (NVEWS) will help USGS better monitor nation’s most dangerous volcanoes
In September 2004, USGS scientists detected sudden, but unmistakable, signs that Mount St. Helens was waking up. Volcano monitors had picked up the occurrence of hundreds of small earthquakes and other signals that the volcano’s crater floor had begun to rise. Within a week, several eruptions blasted clouds of ash into the atmosphere, and soon after, a new lava dome emerged in the crater.
Kīlauea Volcano Erupts
Today's update for June 21st, 2018 will be the last of the daily updates on this USGS feature story. We encourage you to keep checking the USGS Hawaiian Volcano Observatory (HVO) Kīlauea status website for daily activity updates. You can also visit the USGS Facebook page and the USGS Twitter feed as updates become available. For press inquiries, please email volcanomedia@usgs.gov.
EarthWord–Vog
Just like smog and fog, this EarthWord is not what you want to see while driving...
Living with Vog on an Active Volcano: New Resources
New informational products about the health hazards of volcanic air pollution known as “vog,” are available through a new interagency partnership.
EarthWord: Fumarole
Fumaroles are openings in the earth’s surface that emit steam and volcanic gases, such as sulfur dioxide and carbon dioxide. They can occur as holes, cracks, or fissures near active volcanoes or in areas where magma has risen into the earth’s crust without erupting. A fumarole can vent for centuries or quickly go extinct, depending on the longevity of its heat source.
New Study Looks at How People Cope with Vog
A new study to examine how people who live downwind of Kīlauea Volcano cope with volcanic gas emissions, or vog, is currently underway.
Kilauea’s Volcanic Gases and Their Environmental Impacts
U.S. Geological Survey Hawaiian Volcano Observatory scientists Jeff Sutton and Tamar Elias will update information on Kīlauea Volcano’s gas emissions and associated environmental impacts. Their presentation will be at the park’s Kīlauea Visitor Center Auditorium. Park entrance fees apply.
PubTalk 8/2018 — What on Earth is going on at Kilauea Volcano?
Title: What on Earth is going on at Kilauea Volcano?
- First significant summit explosions in nearly a century
- Largest summit collapse volume since at least 1800
- Voluminous fissure eruptions feeding channelized lava flow
- Unparalleled new opportunities for understanding the volcanic system
USGS HVO geochemist measuring gases released from Kīlauea Volcano
USGS Hawaiian Volcano Observatory geochemist measuring gases released from Kïlauea with a Fourier transform infrared (FTIR) spectrometer, an instrument that detects gas compositions on the basis of absorbed infrared light. The data obtained from FTIR measurements have been useful in identifying the many components of volcanic-gas emissions, which provide information on the
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Gas plume from Halemaʻumaʻu Crater, Kilauea Volcano
With stagnant winds present, the plume from Halema`uma`u Crater at the summit of Kilauea Volcano, stands straight up, showing off the distant, but bright, full moon.
Active lava lake at summit of Kīlauea volcano
Aerial photograph of active lava lake in Hale maʻumaʻu Crater at the summit of Kīlauea volcano.
Fumarole on Kīlauea Volcano, Hawaiʻi
Fumarole on Kīlauea Volcano, Hawaiʻi. Elemental sulfur vapor escaping from the fumarole has cooled to form yellow-colored crystals around its margins. Credit: Robert L. Christiansen.
Collecting Gas Sample at a Fumarole
USGS geologist Deborah Bergfeld collects a gas sample from a superheated (hotter than the boiling point) fumarole in Little Hot Springs Valley at Lassen Volcanic National Park.
Collecting Gas at a Boiling Pool
USGS geologist Laura Clor (right) and Rachel Teasdale (California State University – Chico, left) collect gas samples from a thermal feature at Sulphur Works in Lassen Volcanic National Park.
Monitoring Volcanic Gases on Kilauea's East Rift Zone II
Hawaiian Volcano Observatory Geochemist Jeff Sutton and CSAV international volcanology students visit a continuous gas monitoring site on Kilauea's east rift zone during field studies portion of the summer training course. Instrumentation at this site measures ambient concentration of noxious sulfur dioxide gas released from the volcano's vents, along with
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Monitoring Volcanic Gases on Kilauea's East Rift Zone
Hawaiian Volcano Observatory Geochemist Jeff Sutton and CSAV international volcanology students visit a continuous gas monitoring site on Kilauea's east rift zone during field studies portion of the summer training course. Instrumentation at this site measures ambient concentration of noxious sulfur dioxide gas released from the volcano's vents, along with meteorological
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Collecting Volcanic Gas Samples
Steven Ingebritsen (lower right, in blue hat) kneels in the warm mud as he collects samples of the gases emitted from the fumaroles on the north side of Crater Rock on Mount Hood. The samples are taken back to the laboratory for an analysis of the gases' chemical composition. By routinely collecting gas samples and comparing their composition to past measurements,
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Volcanic Gas Sampling
Christoph Kern acquires ultraviolet images of volcanic gas over the dome and crater of Mount St. Helens. Although practically invisible to the human eye, sulfur dioxide absorbs ultraviolet light and appears dark in images captured by the equipment. Sulfur dioxide is typically emitted from magma as it approaches the surface, so surveys are conducted on a regular basis at
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The Air We Breathe…It’s a Gas!
We live at the bottom of an ocean of air. Most adults take around 29,000 breaths a day, children breathe a little faster; but what is in this air we breathe? What are the gases in the air? How much of each gas is there? Do these gases have different weights? How cold are liquid nitrogen and dry ice, and where did those names come from? Come join us to explore these