Lobby > Exhibits > Why Geysers Erupt > Geyser Ingredients > Heat >Norris Geyser Basin

THERMAL DISTURBANCES

Periodically, Norris Geyser Basin experiences large-scale changes that last a few weeks. This phenomenon is so common that it is known as a thermal disturbance. The water levels in hydrothermal features change, temperatures and pH levels fluctuate, and eruptive patterns become different.

The thermal disturbances at Norris are not fully understood. Some scientists think they result from a subterranean eruption within the underground reservoir that supplies water to the area's hydrothermal features. Other researchers speculate thermal disturbances may be due to fluctuations in the geyser basin's water supply.

In late summer, when there is less cool surface water, changes in temperature and pressure might occur in the groundwater system feeding the hydrothermal vents, with the result that the deeper reservoir becomes overheated.

Other scientists theorize that thermal disturbances may be related to earthquakes or due to fluctuations within the underlying magma chamber.

Next | 1 > 2 > 3 > 4 | Next Section: Water