The Big One: The Cascadia Earthquakes and the Science of Saving Lives

This is an excellent explanation of seismic processes as specifically relates to the Pacific Northwest, though it includes an overview of plate tectonics applicable anywhere in the globe. There is also a decent chapter on basic disaster preparedness. It seems to be geared to about 4th to 6th graders, though it would be very accessible to a scientifically inclined younger child with a little adult guidance, and it does not talk down to the reader or dumb down the information, so older students and adults could still get something out of it. Sort of a read-and-done for me on that account, but I will be donating it to my local library, since some adult or young person can certainly get something out of it.