Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week’s contribution is from Michael Poland, geophysicist with the U.S. Geological Survey and scientist-in-charge of the Yellowstone Volcano Observatory.

The continuous GPS station at White Like, designated WLWY (GPS stations are always given four-character codes), is one of the most interesting in all of Yellowstone National Park. The station was installed in 1999 on the Sour Creek resurgent dome — one of two uplifted areas of Yellowstone caldera that formed due to magma accumulation shortly after the major caldera-forming eruption about 631,000 years ago (the other is the Mallard Lake dome, near Old Faithful).

The Sour Creek resurgent dome continues to d

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