George A. Algard, Guide to the Norris Geyser Basin (1974)
“ The fact that thermal features change may come as a surprise, but remember that geysers, hot springs and other thermal phenomena are subject to natural stresses just like plant and animal communities. Of course the changes in thermal activity result from a different set of factors than those affecting plants and animals. ”
George A. Algard, Guide to the Norris Geyser Basin (1974)
“ Because of constant change in the thermal features, the ground here is unstable and hazardous in many locations. Therefore, you are required to stay on designated trails and boardwalks at all times. This not only protects you from possible serious burns but also helps preserve the features as well. Remember also not to throw any objects into thermal features. Debris of any kind in a hot spring or geyser could clog the vent and destroy the feature. Because many scalding hot pools and run-off channels are near trails and boardwalks, pets are not permitted on the trails. ”
George A. Algard, Guide to the Norris Geyser Basin (1974)
“ Shifts in the earth’s crust (earthquakes) result in movements along cracks and fissures in the ground. These tremors usually cause changes in the underground “plumbing systems” of thermal features, thus altering activity patterns. Look for signs of recent activity variations as you walk along the trails, or ask a naturalist if there have been some recent changes. ”
