An interactive geothermal heat map plots 1,723 U.S. hot springs over a heat-flow model to show where subterranean heat reaches the surface fastest. It pairs each spring with measured water temperature where available and flags attributes useful to visitors (soakability, access, camping, photos). Key summary statistics: 1,596 springs have heat-flow data, the median heat flow at springs is about 102 mW/m² - roughly 1.6 times the U.S. average of 65 mW/m² - and the hottest ground measured reaches about 257 mW/m². The map explains that most springs cluster in the West because crustal stretching and faulting brings hot rock closer to the surface; the East has only scattered springs that circulate unusually deep.
Rankings list springs with the highest modeled heat flow (Steamboat Springs, multiple California sites) and the hottest measured waters (geyser fields, fumaroles and boiling pools such as The Geysers and several Alaskan and Nevada sites), noting many extreme-temperature features are unsafe to soak. State-by-state medians show Colorado, Wyoming, Idaho, California and Utah among the highest. Landsat thermal imagery highlights geothermal areas from orbit. Data come from the Stanford Thermal Earth Model, Landsat/USGS, and federal/open datasets; the heat-flow CSV is available under CC BY 4.0.
Summary generated by AI from the linked article. hn.today is not affiliated with Hacker News or Y Combinator.
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