I remember reading about a volcano in the western part of the USA that has been dormant for as long as anyone can remember, but recent measurements indicate there is an alarming change. It seems a dome is rising in what could be the center. I remember reading about a volcano in the western part of the USA that has been dormant for as long as anyone can remember, but recent measurements indicate there is an alarming change. It seems a dome is rising in what could be the center. There are no volcanoes in the western US right now that have actively growing domes.
Long Valley is a large silicic caldera complex that has shown some signs of perhaps inflating.
However, the evidence is not entirely clear. There was some seismic unrest back in the early 1980's and an extensive monitoring network was installed.