Chapter 6 terms

Epicenter

the location on Earth's surface directly above an earthquake's focus

Earthquake

A measurable movement of the earths crust

Intensity

A measure of the concentration of energy or the effects of the energy released

Richter scale

A scale that rates the magnitude of the intensity of an earthquake

Seismometer

Instrument used to measure horizontal or vertical motion during an earthquake.

Stress

Measure of force exerted within an object

P wave

The first earthquake wave that reaches a seismic station from an earthquake

Focus

The point of an earthquakes origin deep within the earth

S wave

The second earthquake wave that reaches a seismic station from an earthquake

Magnitude

The size or intensity of some measurable quantity