Geysers may become more active or become dormant. These disturbances generally last from a few days to more than a week. Thermal features of Norris Geyser Basin Back Basin Emerald Spring - Clear blue water combines with the yellow sulfur coated crater to create a breathtaking green color. This spring is 27 ft deep and the average temperature is 190 F. Steamboat Geyser - Erupting over 300 ft, Steamboat geyser is the world s tallest active geyser. For hours after the rare 3-40 minutes eruptions, Steamboat thunders with powerful jets of steam.
Full eruptions are entirely unpredictable.
There have been no eruptions between 1992-1995. Echinus the largest acid-water geyser known. Acid geysers are extremely rare, however most of the planet s acid geysers are found in the Norris Geyser Basin. Once a small hot spring that occasionally erupted, Porkchop geyser became a continuous spouter in the spring of 1985. The force of the spray caused a boisterous roar that could be heard from the museum.