Day 8, 9 & 10, August 12, 13 & 14, 2016
Yellowstone has at least 1,283 geysers that have erupted in the park and approximately 465 of them are active in any given year. Geysers are characterized by the intermittent eruptions of super-heated water that ejects from them, with some of the water turning into steam as it hits the cooler air. They only occur where there is magma close to the surface of the earth, which is required to heat the water to the necessary temperature.
There are two types of geysers, a fountain geyser and a cone geyser. The fountain type is a geyser that erupts from a pool of water – Grand Geyser, the tallest predictable geyser on earth is a fountain geyser. A cone geyser erupts from cones or mounds of siliceous sinter – Old Faithful is a cone geyser.
Some of the geysers we saw were just bubbling quietly, not erupting. Not nearly as exciting as an erupting geyser, but mesmerizing in their own right…
We also saw White Dome Geyser erupting. We were in the car driving toward it, and by the time we got there it was done. It erupts every 15 minutes to 3 hours, most commonly every 20 – 30 minutes, but we didn’t stick around to see the next one. There is only so much time in a day at such a big park!
We did see Old Faithful erupt twice while we were in Yellowstone. Old Faithful is located in the Upper Geyser Basin of the park and is one of the most predictable geysers there. It erupts approximately once every 65 and 91 minutes – the interval between eruptions depends on the length of the last eruption. It shoots high into the air, between 106 and 185 feet, and each eruption lasts between 90 seconds and five minutes. What a sight to see!
Interestingly, Old Faithful was once used as a laundry. In 1882, General Philip Sheridan’s men were stationed in Yellowstone and they used to throw their dirty clothes into the geyser, to be ejected clean with the next eruption (I am not sure what happened if you didn’t catch them before they fell to the ground though). Apparently linen and cotton clothes came out just fine, but wool clothing got ripped to shreds. Don’t try this when you go folks… I have a feeling this type of behavior is frowned upon…
Next up – Mud Pots!