Seismic geyser in Yellowstone’s Upper Geyser Basin during an eruption in 1969

Seismic geyser in Yellowstone’s Upper Geyser Basin during an eruption. Based on the study of George Marler and USGS scientist Donald E. White on the effects of the August 1959 Hebgen Lake, Montana, earthquake on hot springs in Yellowstone’s Upper Geyser Basin, fumaroles in what was eventually called “Seismic Geyser” (not listed in the U.S. Board on Geographic Names) were active until late 1962 or early 1963. During the 1962–1963 winter, one or more explosive events enlarged the eastern fracture into a crater. The crater acted as a geyser since 1963, and the western fracture gradually ceased fumarolic activity. Photo by George Marler, Yellowstone National Park, in 1969.