Long Valley.
Not Mono Lake.
Mammoth Mountain.
Phreatic eruptions have happened quite often at Mono Lake and Mammoth Mountain.
BTW, the Long Valley Caldera risk is VERY HIGH while Yellowstone is HIGH.
Nearly every single volcano in the Cascades are at a very high risk level. Alaska has several at very high risk levels also.
BTW, the Long Valley volcano was the abt third largest KNOWN super volcanic eruption on this continent.
There is one on the Utah Nevada border that was most likely bigger, but that one is extinct. Dont remember the name. They are still studying that one.
I read that Mt. Suribachi on Iwo Jima, a Japanese island that was in the news about 76 years ago is also at somewhat of a risk—and could set off a nasty tidal wave if it blows.
“There is one on the Utah Nevada border that was most likely bigger, but that one is extinct. Dont remember the name. They are still studying that one.”
Dammeron Valley...? There’s a couple cinder cones in the region north of St. George: Santa Clara “volcano” and Veyo — both named for nearby towns. I actually have been on the flanks of the Santa Clara volcano; long ago extended family created something of a stir up in that caldera with some old tires, scrap lumber and blasting caps. Locals thought the thing might be sputtering to life.
There is also an extinct super volcano in the Dakotas