- Cone-Type Geyser:
- A geyser whose eruption is jetted as a steady column of
water and steam from a vent with little or no surface
pool. It is not necessary that the vent be at the top of
a cone formation. Old
Faithful Geyser is a cone-type geyser.
- Cyclic:
- A geyser that has a series of
eruption at relatively short intervals separated from the
next series by a relatively long quiet period.
- Disturbance:
- When applied to Norris Geyser Basin, describes a basin
wide or partial basin change in not only geyser and pool
behavior but also water temperatures and chemistry. When
a disturbance occurs, many dramatic changes can take
place. Many previously quiet geysers and pools start
erupting. Other pools become murky or change color. And
many geysers erupt much more vigorously. Not all geysers
are affected positively though. The possibility of a
major Steamboat
eruption seems to be quenched by the onset of a
disturbance for instance. What causes the disturbance?
Well, one theory holds that the disturbance is the
manifestation of a second hot water reservoir interacting
with the surface features. This theory is supported by
the change in water chemistry. Disturbances were first
noted occurring in the Fall and covering the entire basin
but have since been recognized in other seasons and
sometimes only affecting small portions of the basin at a
time.
- Dormant:
- When a geyser is not active, it is dormant.
- Duration:
- The period of time from the start of an eruption to the
end of that eruption.
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- Fountain-Type Geyser:
- A geyser whose eruptions occur in a series of separate
burst, usually through a pool of water over the vent. Grand Geyser is a
fountain-type geyser.
- Fumarole:
- A steam vent. A fumarole is related to a hot spring but
the temperature is so high and the water supply so
limited that all water is emitted as steam and no pool is
able to form.
-
- Geyser Gazer:
- A geyser aficionado.
-
- Geyser Hill Wave:
- A theory proposed by T. Scott Bryan that attempts tie
together some of the activity seen on Geyser Hill. The
geyser hill wave can be thought of as a wave of energy
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