I'm trying to imagine how Supervolcano could have been made more boring. Nothing comes to mind. This is Vol. 3, with at least one more in the works. As near as i can tell, the author set out to demonstrate that destroying half the country and inaugurating a new Ice Age could be less interesting that episodes of Ozzie and Harriet set in Turku. It's a tough challenge, but he did it.
Twelve hundred pages. Recall the old saw that warfare is long periods of boredom punctuated by instants of stark terror? Turtledove doesn't believe in punctuation.
In Book 1, the Yellowstone volcano blows. Ten pages of running like Hell, and then 200 pages of getting to know a dysfunctional family that you really wish you hadn't. Oh, there's a serial killer, but he/she has nothing to do with the plot and nothing really happens except that he/she (avoiding spoilers) kills a few people. Oh, and a middle-aged lady gets pregnant. Woohoo.
Book 2, nothing happens. I mean, really, nothing. People in LA endure the hardship of not having reliable Internet service or fresh bananas. There's a moment of potential when an extremely unlikeable character encounters a survivalist enclave in the middle of devastated and uninhabitable Kansas (Is that redundant?), but it's Ok, they only are on stage long enough to take a potshot at our heroine, who skedaddles. End of plot thread. Meanwhile, her brother continues to hunt moose in Maine. Then a caffeine jolt: Turtledove gets tired of the serial killer thread so he tells us who the killer is -- totally from left field.
Book 3, unlikeable heroine gets ripped off by Balkan terrorist boyfriend who turns out to have hacker skills. Who knew? Everybody gets older... like the story. Main character gets shot and applies for pension. Pension comes. Stay tuned.