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Alan Glennon, Department of Geography, University of California, Santa Barbara

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CTV News

Yellowstone National Park rattled by largest earthquake in 34 years
A U.S. Geological Survey team planned to tour the Norris Geyser Basin on Sunday to determine if the quake altered any of Yellowstone's geothermal features, such as geysers, mud pots and hot springs. Several people reported having felt shaking they ...
4.8 quake shakes Yellowstone National ParkGreat Falls Tribune

all 212 news articles »

5 strangest geysers of the West
SALT LAKE CITY — When most people think of geysers, they immediately associate the word with Yellowstone National Park. This is ... But unlike the Fly Geyser, and nearly all other geysers in the world, the Crystal Geyser isn't powered by geothermal ...

Toronto Sun

Yellowstone National Park Hit By Magnitude 4.8 Earthquake
Huffington Post
A U.S. Geological Survey team planned to tour the Norris Geyser Basin on Sunday to determine if the quake altered any of Yellowstone's geothermal features, such as geysers, mud pots and hot springs. Several people reported having felt shaking they ...
Bison running in Yellowstone doesn't signal volcano eruptionReno Gazette-Journal
Animals fleeing Yellowstone supervolcano?WND.com
Yellowstone volcano eruption could easily mark world's endThe Voice of Russia
Toronto Sun -CANOE
all 163 news articles »
NBC Montana

The Best Of Yellowstone National Park
National Parks Traveler
In the book of that title Mr. Leftridge, a former naturalist in Yellowstone, lays out chapter after chapter of "bests," from Best Geysers and Best Mudpots to Best Places to Fish and even Best Things to Do on a Rainy (or Snowy) Day. Of course, "best of ...
Study looks at Old Faithful area and developmentCasper Star-Tribune Online

all 42 news articles »
Austrian Tribune

Earthquakes in Yellowstone: 'Elevated but not unusual'
File photo of Norris Geyser Basin, near the epicenter of the magnitude 4.8 earthquake that rattled Yellowstone National Park in Wyoming on March 30, 2014. Photo by Jim Peaco / National Park Service / November 22, 2013. Via LA Times. Why is Yellowstone ...
Yellowstone 'fleeing bison' video goes viral, fuels super-volcano fearsThe Star Online
End-of-the-world eruption still a ways offThe Albany Herald
Volcanic Eruption at Yellowstone National Park Will Not End the World: ExpertsAustrian Tribune

all 70 news articles »

Yellowstone volcano eruption fear dismissed by scientists
Chicago Tribune
Yellowstone National Park assured guests and the public on Thursday that a super-volcano under the park was not expected to erupt anytime soon, despite an alarmist video that claimed bison had been seen fleeing to avoid such a calamity. ... that struck ...

Wall Street Journal

Planning a National Park Vacation? State Parks Are No-Frills Alternatives
Wall Street Journal
No, there aren't any geysers or sprawling lodges named for former presidents, but this 11,000-acre park in southeastern Idaho does have views of snow-capped Tetons and Yellowstone-caliber fly fishing and wildlife. Nestled in a massive caldera, the park ...


15 of nature's most spectacular shows
The cracking of mammoth chunks of ice in Alaska's Glacier Bay is a sight -- and sound -- to behold. Mount Yasur puts on fiery displays on .... Yellowstone National Park in the United States contains the world's largest collection of geysers, which are ...

Yellowstone supervolcano stirs up fears of future uncertainty, lethal eruptions
The Voice of Russia
Only then scientists realized that under woods, meadows, rivers, lakes and canyons there was pulsating magma. This explains the origin of hundreds of Yellowstone geyser.s. That was a wow – paradise in a volcano crater! The volcano erupted a total of ...

Deseret News

Utah's popular 'soda-pop geyser' is fizzling out
Deseret News
"Better than Yellowstone!" Chandler said of those good old days. "It would go up and stay!" Geo-engineering student Rick Lyons agrees. He's a University of Utah geo-engineering student who's writing his thesis on Crystal Geyser. "They used to have ...

and more »
What are geysers and why are they so rare?
Last update: 9 August 2008

A geyser is a hot spring that periodically erupts, throwing water into the air. Though that sounds simple, geysers are extremely rare. As of August 2008, the total of active geysers on earth numbered approximately 1000.

Pink Cone Geyser, Yellowstone, photo by Alan Glennon Conditions must be just right for geysers to occur. Three components must be present for geysers to exist: an abundant supply of water, an intense source of heat, and unique plumbing. Water is common in nature, heat can come from volcanic activity, but the plumbing is critical. For water to be thrown into the air, geyser plumbing must be water- and pressure-tight. Geyser scientists and observers have identified the volcanic rock rhyolite as being particularly effective at hosting geysers. Rhyolite is high in silica, which can deposit a water-tight seal along the walls of the geyser plumbing. Most of the geyser fields in the world are found in rhyolite or similar silica-laden rocks (like ignimbrite). The mixture of water, volcanic heat, and plumbing is exceptional at Yellowstone National Park. Over one-half of the world's geysers are located within the park's boundaries.

It is increasingly apparent that geysers must possess a fourth characteristic to exist: remoteness. Within the last fifty years, volcanic heat and abundant water have been increasingly harnessed to turn turbines for electricity production. Geothermal energy can be produced at any site where volcanic heat and water are readily available. Unfortunately, geyser fields are ideal for this type of energy production. Geothermal energy production steals the geysers' water, and destroys geyser activity (for example, Wairakei, New Zealand). A growing threat to geysers stems from mineral extraction. Hot groundwater may precipitate gold or other valuable minerals, and extraction may require removing the geyser plumbing itself. For example, in May 2003, mineral exploration at South Americas second largest geyser field (Puchuldiza, Chile), caused cessation in the fields geysers. Few realize the actual rarity of geysers. As a result, many geyser fields have been destroyed and many others are being threatened.

How do geysers work?

The following is an excerpt from Scott Bryan's GEYSERS OF YELLOWSTONE, 3rd edition, copyright 2001. It is reproduced here for educational purposes. Scott Bryan's book not only describes each Yellowstone geyser in detail, but also includes descriptions of geyser fields worldwide. It is probably the best book on geysers out there. Buy it or check it out!

The hot water, circulating up from great depth, flows into the plumbing system of a geyser. Because this water is many degrees above the boiling point, some of it turns to steam instead of forming liquid pools. Meanwhile, additional, cooler water is flowing into the geyser from the porous rocks nearer the surface. The two waters mix as the plumbing system fills.

Morning Glory Pool, Yellowstone National Park, Photo by Alan Glennon The steam bubbles formed at depth rise and meet the cooler water. At first, they condense there, but as they do they gradually heat the water. Eventually, these steam bubbles rising from deep within the plumbing system manage to heat the surface water until it also reaches the boiling point. Now the geyser begins to function like a pressure cooker. The water within the plumbing system is hotter than boiling, but "stable" because of the pressure exerted by all the water lying above it. (Remember that the boiling point of a liquid is dependent upon the pressure. The boiling point of pure water 212 degrees Farenheit (100 degrees Celsius) at sea level. In Yellowstone the elevation is about 7,500 feet, the pressure is lower, and the boiling point of water is only about 199 degrees Farenheit (93 degrees Celsius).

The filling and heating process continues until the geyser is full or nearly full of water. A very small geyser may take but a few seconds to fill whereas some of the larger geysers take several days. Once the plumbing system is full the geyser is about ready for an eruption. Often forgotten but of extreme importance is the heating that must occur along with the filling. Only if there is an adequate store of heat within the rocks lining the plumbing system can an eruption last for more than a few seconds. Again, each geyser is different from every other. Some are hot enough to erupt before they are completely full and do so without any preliminary indications of an eruption. Others may be completely full well before they are hot enough to erupt and so may overflow quietly for some time before an eruption occurs. But, eventually, the eruption will take place.

Because the water of the entire plumbing system has been heated to boiling, the rising steam bubbles no longer collapse near the surface. Instead, as more very hot water enters the geyser at great depth, even more and larger steam bubbles form and rise toward the surface. At first, they are able to make it all the way to the top of the plumbing system. But a time will come when there are so many steam bubbles that they can no longer simply float upwards. Somewhere they encounter some sort of constriction or bend in the plumbing. To get by they must squirt through the narrow spot. This forces some water ahead of them and up and out of the geyser. This initial loss of water reduces the pressure at depth, lowering the boiling point of water already hot enough to boil. More water boils, forming more steam. Soon there is a virtual explosion as the steam expands to over 1,500 times its original, liquid volume. The boiling rapidly becomes violent and water is ejected so rapidly that it is thrown into the air.

The eruption will continue until either the water is used up or the temperature drops below boiling. Once an eruption has ended. the entire process of filling, heating, and boiling will be repeated, leading to another eruption.

Old Faithful Geyser, Yellowstone - Alan Glennon 2004

In Depth

To reference this page, use the appropriate variation of the following format:

J. Alan Glennon. (2008) About Geysers, http://www.geyserworld.com, University of California, Santa Barbara, originally posted January 1995, updated August 9, 2008.

T. Scott Bryan (2001) The Geysers of Yellowstone, 3rd edition, University Press of Colorado: Boulder, pp.472.

For more information, contact:
J. Alan Glennon
Department of Geography
University of California
Santa Barbara, California 93106

e-mail: glennon(at)umail.ucsb.edu