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?Sylvan Springs, a mile and a half off the highway, produced a brand-new mud volcano on a wooded slope. Its crater is 75 by 50 feet and it churns and pumps continually, throwing out gray, soupy mud and bouncing the tree trunks that fall into it up and down.
?Fountain Paintpot, in the Lower Geyser Basin, demonstrates greatly increased thermal activity. The Paintpot is bubbling and boiling, with new fumaroles sending out smoke and with white plumes emerging from cracks in the nearby parking lot.
?Mount Holmes, a 10,300-foot mountain, lost part of its northeast face in a rockslide 3,000 feet high and a mile wide at the bottom.
?Secret Valley, between Madison Junction and Norris, disgorged a mud slide which came down the mountain and spread out through the forest.
?Obsidian Cliff, between Mammoth and Norris, gave way, covering the road with fragments of volcanic glass. The new face of the cliff, jagged and shiny, now glistens brightly new in the sunlight.
These are only a few of the more dramatic results of the quake. In the course of our week-long stay, traveling around the park and hiking into the woods with some of the first surveying parties to penetrate these areas, we saw many more.
The most astonishing of the new developments is the activity of Sapphire Pool. Before the quake the water in this 30-foot crater was a beautiful blue. During its miniature eruptions it sent small quantities of water gurgling out among odd-shaped limestone deposits called "biscuits."
It continued this activity for several weeks after the initial quake. Then, following one of the aftershocks on September 5, the pool began erupting violently. In 72 major eruptions at about two-hour intervals it sent boiling water 75 to 150 feet high. This action stopped on September 13, and the pool subsided to a violent boiling until September 29. At 6:35 p.m. on that date another tremor occurred and Sapphire went into action again. Since then it has continued to erupt at intervals of 30 minutes to one and a half hours.
During my investigation of earthquake results in the park I spent parts of three days watching the fascinating behavior of Sapphire. The great limestone mound in which the crater is located was scoured by the hot floods of successive eruptions. "These limestone biscuits around the pool used to be a beautiful green," explained Robert N. McIntyre, the chief park naturalist. "Now you can see that the big eruptions have burned them to a dull gray and the limestone layers over the whole mound are being flaked off."
Steam rose from the water as the pool slowly filled before each major outbreak. I watched a number of these but none was as great as the eruption I was to see at 3 p.m. on October 18.