There are many lakes in that basin (aptly called Lakes Basin) - One is Mary Lake and one is Horseshoe Lake. The monitoring and tree kill is around Horseshoe lake. (at least one of the tree kill areas) - not that I'd camp out at Lake Mary either!

I was fortunate enough to hear a lecture given by the gentleman in the picture in the page linked below (I'm bad for remembering names!)

Canie

• CO2 monitoring Long Valley Caldera