Seismologists have just registered an earthquake in Seward, Alaska, that is big enough to produce a tsunami. The ocean depth is 4,000 meters. Use the wave speed formula to approximate the tsunami's ...

Something is not quite right inside the Earth's core. When seismic waves from earthquakes ripple through its solid center, they hit a speed bump. The seismic vibrations should zip along about 30 ...

Review subduction zones and how earthquakes occur in these zones. (See Activity Answer for more information.) Draw a subduction zone on the board and review with students how the December 26, 2004, ...