Did you know that the earth is always moving? Even as you read this, the ground under your feet is shifting very, very slowly. Because it happens so slowly, you

150 original photos, figures & tables on the New Madrid Seismic Zone of faults, fissures, & scars in the landscape still visible from the great earthquakes of 1

Examines earthquakes, discussing what causes them, how they are measured, and how they can cause tsunamis. Includes a section on the San Francisco earthquake of