Grand Geyser - Yellowstone N.P., Wyoming
Posted by: Volcanoguy
N 44° 27.992 W 110° 50.244
12T E 512933 N 4923704
Quick Description: Grand Geyser is located in the Upper Geyser Basin of Yellowstone National Park.
Location: Wyoming, United States
Date Posted: 3/6/2012 7:10:50 PM
Waymark Code: WMDXHA
Grand Geyser is a fountain-type geyser. The interval between eruptions ranges from 6 to 15 hours with an eruption duration of 9 to 12 minutes. The eruptions reach heights of 150 to 180 feet. Grand’s eruptions are related to the activity of near by geysers, especially Vent Geyser and Turban Geyser which begin erupting shortly after Grand starts and then continue after Grand quits.
Information sources: The Geyser Observation and Study Association (visit link
) and Yellowstone National Park.com (visit link
Text of sign at Grand Geyser:
World’s Tallest Predictable Geyser
Known for the height and beauty of its eruptions, Grand Geyser’s activity is linked with that of nearby geysers. An intricate sequence of events that takes place over 7 to 15 hours culminates in explosions of boiling water and steam from Grand’s pool. A full eruption can last from 9 to 12 minutes and reach heights of 180 feet or more.
Grand Geyser is a fountain-type geyser.
Grand’s eruptions occur in one or more bursts from its crater or pool. There is a short wait between bursts.
Turban Geyser erupts every 15 to 22 minutes. Grand erupts at the onset of one of Turban’s eruptions.
The Grand “Group”
The prominent sinter bowl nest to Grand Geyser is Turban Geyser. A small crack left of Turban’s sinter shoulder is Vent Geyser. These three geysers share a subterranean source of hot water.
Turban Geyser erupts more frequently than the other two. Grand will erupt just before or after Turban erupts. The water level is Grand fluctuates with each Turban eruption, usually dropping noticeably. As an eruption of Grand Geyser nears, boiling water surges over the rim of its pool. Within seconds, Grands will erupt. Finally, Vent Geyser comes to life, jetting water to heights of 75 feet. Though Grands’s eruptions last only about 10 minutes, Vent and Turban can continue to erupt for an hour or more.