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What do recent eruptions at Steamboat Geyser in Yellowstone National Park mean?

Posted at 9:46 AM, May 03, 2018
and last updated 2018-05-03 11:46:56-04

The notoriously fickle Steamboat Geyser in Yellowstone National Park has erupted three times since March 15th. Before that, it hadn’t erupted since September 2014. So what does it mean?

Steamboat is the tallest active geyser in the world. Even the little eruptions we’ve seen this spring are 10 times the size of a typical Old Faithful blast. That means back in 2014, Steamboat was more than 20 times what you see at Old Faithful.

But Old Faithful got its name for a reason. You can practically set your watch by it. Not so much for Steamboat. After 1911 it went to sleep for 50 years. 

Then it roared to life in 1961, picked up the pace in 1962, and was spouting water at a twice a month rate through 1965. 

Then it slowed back down and eventually took a nine-year rest before shooting skyward again in 1982 and 1983.

So what’s going on? Well, scientists know what heats things up in Yellowstone.

Hank Heasler explained, “A mass of very hot molten rock, moving up towards the surface. As it moves up it starts to break the overlying rock.”

But what exactly causes Steamboat to wake up and go crazy at wild intervals? Scientists simply don’t really know. There are plenty of theories, but as for proof? We’re still waiting for that.

Still, most scientists who are posting about thermal activity in Yellowstone don’t think this is a prelude to a volcanic eruption. They’re not convinced that the dreaded "super volcano" is likely to awaken soon and most say any activity is likely to be small scale.

Sort of. Heasler said, “They may be even as large as a Mount St. Helen’s eruption, or even much smaller than that. Maybe an individual vent that puts out a very nice Hawaiian-type basalt flow.”

In the meantime, enjoy the water and steam show.


(MARCH 18, 2018) Steamboat Geyser, the tallest active geyser in the world, may have erupted on Thursday, according to Yellowstone National Park officials.

The last major eruption happened on September 3, 2014.

Park geologists compared first-hand reports with readings from remote U.S. Geological Survey thermal sensors and said the eruption may have been one in a series of minor eruptions.

The sensors are now offline, but staff are troubleshooting the equipment and may deploy new ones.

Steamboat Geyser’s activity is very irregular; it was dormant from 1911 to 1961.

According to the Park, only Waimangu Geyser in New Zealand has surpassed Steamboat Geyser to greater heights, but not in more than 100 years.

Steamboat’s minor and major eruptions are unpredictable, but major eruptions can reach heights of more than 300 feet. 

As usual for this time of year, roads to the Norris Geyser Basin are closed for spring plowing.

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