The greatest uplift appeared to be in the area of Le Hardy Rapids on the Yellowstone River, a few miles downstream from the lake's outlet. The results of the resurvey showed dramatically that the central part of the park had indeed risen. These benchmarks were originally installed and their elevations and locations precisely determined in 1923. Geological Survey (USGS) resurveyed a series of benchmarks along roads throughout Yellowstone National Park. To test this idea, in 1975≧7 scientists from the University of Utah and the U.S. In this way, the water level of Yellowstone Lake would appear to rise at the south end. If the entire area was being pushed up, perhaps the ground at the north end of the lake was rising more than the south end, like a giant bathtub lifted at one end. Scientists reasoned that these observations could be explained by southward tilt of the area around Yellowstone Lake, including the lake basin itself. At the same time, the water level at the lake's outlet on its north side appeared little changed. One important clue was found along the south shore of Yellowstone Lake, where trees were dying because their trunks were partly below water and a boat dock had become completely submerged. In the early 1970s, Earth scientists found evidence that this system was more active than even these spectacular hydrothermal (hot water) features had suggested. ![]() However, the area's many geysers and hot springs indicate that the underlying volcanic system remains active. No actual volcanic eruption has occurred in the Yellowstone National Park region of Wyoming, Montana, and Idaho since a lava flow poured out about 70,000 years ago. (Photo courtesy of Christine Puskas, University of Utah.) Global Positioning System (GPS) stations like this one in the Norris Geyser Basin can detect changes in elevation and horizontal shifts of 1 inch or less per year, helping scientists understand the processes that drive Yellowstone's active volcanic and earthquake systems. Geological Survey, and other scientists to assemble a more precise and detailed picture of Yellowstone's ground movements. More recently, new and revolutionary satellite-based methods for tracking the Earth's shifting ground motions have enabled University of Utah, U.S. In the 1970s, a resurvey of benchmarks discovered the unprecedented uplift of the Yellowstone Caldera of more than 28 inches (72 cm) over five decades. Geological Survey (USGS), the University of Utah, and Yellowstone National Park to strengthen scientists' ability to track activity that could result in hazardous seismic, hydrothermal, or volcanic events in the region In 2001, the Yellowstone Volcano Observatory was created by the U.S. Since the 1970s, scientists have tracked rapid uplift and subsidence of the ground and significant changes in hydrothermal (hot water) features and earthquake activity. ![]() The world-famous Yellowstone geysers and hot springs are fueled by heat released from an enormous reservoir of magma (partially molten rock beneath the ground). Tracking Changes in Yellowstone's Restless Volcanic System Information about geysers is available at (University of California, Santa Barbara).Tracking Changes in Yellowstone's Restless Volcanic System | USGS Fact Sheet 100-03 You can learn more about the geysers and geology of Yellowstone National Park at (National Park Service). ![]() Geyser bashing: Distant quake alters timing of eruptions. That’s a long, long way over which an earthquake’s effects can be felt! A spring that’s normally clear turned muddy. A few springs that are normally calm surged into a raging boil. The quake influenced some of the park’s hot springs, too. The famous geyser Old Faithful wasn’t affected at all. The researchers think underground vibrations traveling all the way from Alaska loosened mineral deposits that normally regulate geyser eruptions. Others, such as Lone Pine Geyser, erupted less often. Some geysers, such as Daisy Geyser, erupted more often for a few weeks after the quake. ![]() Of those, eight changed their patterns for a few weeks after the quake, records show. The park uses instruments to monitor 22 geysers around the clock. Geysers are spouts of water that shoot out of the ground at periodic intervals. The earthquake had an especially large effect on some of the geysers in the park. 3, 2002, affected underground activity in Yellowstone more than 3,100 kilometers away, say geologists from the University of Utah in Salt Lake City. Amazingly, an earthquake that shook Alaska on Nov. Scientists recently turned up a new surprise at Yellowstone. Yellowstone’s Castle Geyser erupted less often after underground vibrations from a large earthquake in Alaska rippled through the park in November 2002. With more than 10,000 geysers, hot springs, and steaming volcanic vents, there’s always something spewing, spouting, or bubbling over. Underground, Yellowstone National Park in Wyoming is an exciting place.
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