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Hydrothermal Changes in the Upper Geyser Basin, Yellowstone National Park, After the 1983 Borah Peak, Idaho, Earthquake

出版	USGS, 1985
URL	http://books.google.com.hk/books?id=Tzz7zgEACAAJ&hl=&source=gbs_api

註釋Hydrothermal features in Yellowstone have long been known to be sensitive to circulatory changes of hot fluids and gases following local seismic swarms or strong regional events. Just as the August 17, 1959, Hebgen Lake, Montana, earthquake (Ms 7.5), the June 30, 1975, Central Plateau - Norris earthquake (Ms 6.1), and the 1978-79 tremors near Mud Volcano all caused major changes in Yellowstone's thermal basins, the October 28, 1983, Borah Peak, Idaho, Upper Geyser Basin 240 kilometers east of the reported epicenter. A total of 37 features including Old Faithful Geyser are now known to have experienced changes in eruptive activity, temperature, and/or discharge. Evaluation of other possible causes for the thermal changes was made including self-sealing, disturbances, and local seismicity. Changes of Old Faithful Geyser's interval and duration patterns were analyzed and found to be similar to those following other strong regional earthquakes. However, many unanswered questions remain on the local hydrologic controls of the response of Yellowstone's thermal springs and geysers to major seismicity.