You rang?....one resident geologist coming up. Both Mt. Rose and Slide mountain are made of volcanic rocks, but they are not volcanos. Peavine is another one like that. The nearest old volcano is northwest of Tahoe City. Nevada's crust is only about 15km thick, which is why there is so much geothermal activity. The Sierra Nevada range was formed by plate subduction (sinking) offshore which made dozens of volcanos (similar to the Cascades). They have all eroded and what you see is likely what is left of their bases, including solidified magma.
We just got word that the Mogul earthquakes have fault motion similar to the San Andreas (meaning strike-slip), side to side moving southeast to northwest. Might even be connected to the San Andreas in some weird way. Earthquakes are flaring up all over Nevada and Calif. right now. UNR seismo dept. also saying that a 6.0 is possible. Verdi area had 6.0's in both 1914 and 1948.
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