the top layer of the earth, which consists of solid rock. Both the continental
masses) and oceanic crust (the land beneath the ocean) belong to the crust.
Epicenter - the point directly above the focus or source of the earthquake.
Fault - a break or separation in rock, usually between two or more tectonic plates.
Focus - the source of the earthquake inside the earth, where the rock first begins to break.
amount of shaking and type of damage at a particular location. Intensity
greater or weaker depending on the distance from the epicenter.
Liquefaction - this happens when loose, moist soil or sand is shaken so hard that individual grains separate, turning the earth into a soft, fluid slurry that can swallow entire buildings.
Lithosphere - the
uppermost layer of the earth, which consists of all solid rock. It includes
crust and the upper mantle.
Magnitude - the
amount of energy released from the earthquake. The size of the seismic
the epicenter, which can be determined by the size of the wavy lines on the seismogram.
Mantle - the
layer beneath the crust. The upper mantle is solid rock; the lower mantle
Mercalli Scale - a
subjective measure of the strength of an earthquake. It measures the degree
Richter Scale - an
objective measure of the strength of an earthquake. It measures the degree
Seismic Waves - vibrations
that move through the earth in a way similar to waves moving in water.
They can travel through solids and liquids.
Seismogram - written recording of the earth's vibrations, produced by a seismograph.
instrument that plots the intensity of earthquake waves on a roll of specially
Seismologist - scientist who studies earthquakes.
Tectonic Plates -
individual sections of the lithosphere of the earth. They fit together
in a way
similar to a jigsaw puzzle, but are always moving very slowly, floating on the molten rock of the
GO BACK TO JOURNEY
GO BACK TO MAIN MENU