The 1,000-plus alphabetical listings range from historical volcanoes and quakes (both famous and obscure) to entries on specific seismic phenomena (everything from parasitic cones to jökulhlaup) and general geological principles, including a few excellent in-depth discussions on topics like plate tectonics and seismic wave types. The encyclopedia also contains a lengthy bibliography, a list of Internet resources, a chronological listing of notable quakes and eruptions, and a handful of unforgettable eyewitness accounts (after the eruption of Vesuvius in A.D. 79, apparently Pliny the Elder's party went out "having pillows tied upon their heads with napkins; and this was their whole defense against the storm of stones that fell around them").
With its clear, newspaper-style entries, the Encyclopedia of Earthquakes and Volcanoes will be navigable even to geo-newbies, but its a-to-z organization makes it more useful as a reference than as a stand-alone text. (Then again, given its liberal cross-referencing, you can easily find yourself led to a long, enjoyable read.) --Paul Hughes