Pump Geyser is a cone geyser

Geyser

A geyser is a spring characterized by intermittent discharge of water ejected turbulently and accompanied by a vapour phase . The word geyser comes from Geysir, the name of an erupting spring at Haukadalur, Iceland; that name, in turn, comes from the Icelandic verb geysa, "to gush", the verb...

 located in the Upper Geyser Basin of Yellowstone National Park

Yellowstone National Park

Yellowstone National Park, established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872, is a national park located primarily in the U.S. state of Wyoming, although it also extends into Montana and Idaho...

. It is in the Geyser Hill Complex which includes Aurum Geyser

Aurum Geyser

Aurum Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States, on Geyser Hill.Aurum can, at times, be very predictable. Other times it can be very erratic. Observations have led to the theory that Aurum's activity is linked to the meadow behind the geyser....

, Beehive Geyser

Beehive Geyser

Beehive Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. The tall cone resembles a beehive. Beehive's Indicator is a small, jagged cone-type geyser located about from Beehive.-History:...

, Big Cub Geyser

Big Cub Geyser

Big Cub Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States.Big Cub is part of the Lion's Group of geysers, a cluster of geysers that all share an underground connection. The other geysers in this group are Lion Geyser, Lioness Geyser, and Little Cub Geyser....

. Doublet Pool

Doublet Pool

Doublet Pool is a hot spring in the Upper Geyser Basin of Yellowstone National Park, Wyoming.Doublet Pool is deep and its temperature is approximately . Its scalloped edge is made of geyserite. Although geysers rarely occur in Doublet Pool, only two or three have been seen; the pool on the right...

, Giantess Geyser

Giantess Geyser

Giantess Geyser is a fountain-type geyser in the Upper Geyser Basin of Yellowstone National Park. It is known for its violent and infrequent eruptions of multiple water bursts that reach from . Eruptions generally occur 2 to 6 times a year. The surrounding area may shake from underground steam...

 and Lion Geyser

Lion Geyser

Lion Geyser is a cone-type geyser in in the Upper Geyser Basin of Yellowstone National Park in the United States. It is located in the Geyser Hill complex....

, among others.

Pump Geyser erupts almost constantly making splashes 2 to 3 feet high, and thumps without an apparent interval, though there are less productive periods. Then, in 1990, Pump became a true geyser, with intervals and durations of a few seconds. A small boil builds up to a heavy doming of the water which triggers bursting eruptions that spray water up to 15 feet high. After a few seconds of this, the activity dies down to a mere simmer, but, after a pause of a few seconds, the cycle starts anew.

It was most likely named by Frank Jay Haynes

Frank Jay Haynes

Frank Jay Haynes , known as F. Jay or the Professor, to almost all that knew him, was a professional photographer, publisher and entrepreneur from Minnesota who played a major role in documenting through photographs, the settlement and early history of the great Northwest...

, the park photographer from 1883 to 1916. It gets its name because its constant eruptions make a sound similar to that of old style mechanical pump

Pump

A pump is a device used to move fluids, such as liquids, gases or slurries.A pump displaces a volume by physical or mechanical action. Pumps fall into three major groups: direct lift, displacement, and gravity pumps...

.