Choose the word which is different from the rest.

The answer is D. Crater.

A crater is a bowl-shaped depression in the ground that is formed by the impact of a meteorite or other object. Seismology is the study of earthquakes. The epicenter is the point on the Earth’s surface directly above the focus of an earthquake. The focus is the point within the Earth where an earthquake originates. The Richter scale is a logarithmic scale that measures the magnitude of earthquakes.

Crater is the only option that is not directly related to earthquakes. The other options are all related to earthquakes in some way.