Ежемесячный отчёт Йеллоустоунской вулканической обсерватории за ноябрь 2021 г..

Video: ----- Some people have characterized the seasonal rise and fall of Yellowstone as being like breathing. During the summer there is a little pause in the overall trend of subsidence and sometimes even a short episode of slight uplift. The trend reverses in early winter. These summertime episodes are caused by groundwater recharge. As the snowmelt percolates into the subsurface, the ground expands like a sponge. The motion is detected by GPS stations. Norris Geyser Basin behaves a little differently than other GPS sites, but it too, has been showing a seasonal change. In the summers of 2019, 2020, and again in 2021, there has been a little bit of change (1 to 1.5 cm upwarp) during the summer. It wasn’t clear if this was “real” uplift or if it was the same seasonal pattern observed at other GPS stations in the caldera. But over the last month, the signal has turned around just like the other stations,