ES Earthquakes

The location within Earth along a fault at which the first motion of an earthquake occurs is called

• epicenter

• focus

• primary wave

• secondary wave

The point on Earth's surface directly above an earthquake's starting point is called

• epicenter

• focus

• primary wave

• secondary wave

Shear wave that causes particles of rock to move in a side-to-side direction perpendicular to the direction in which the wave is traveling is a

• epicenter

• focus

• primary wave

• secondary wave

Compression wave that causes particles of rock to move in a back-and-forth direction parallel to the direction in which the wave is traveling is a

• epicenter

• focus

• primary wave

• secondary wave

An instrument that records vibrations in the ground is called

• intensity

• magnitude

• seismograph

• seismogram

The amount of damage caused by an earthquake is its

• intensity

• magnitude

• seismograph

• seismogram

A tracing of earthquake motion that is recorded by a seismograph is called

• intensity

• magnitude

• seismograph

• seismogram

A measure of the strength of an earthquake is called

• intensity

• magnitude

• seismograph

• seismogram

The longer the lag time between the arrival of the P waves and S waves,

• the stronger the earthquake's vibrations

• the weaker the earthquake's vibrations

• the closer the earthquake occurred

• the farther away the earthquake occurred

When rocks along a fault slip into new positions, they release energy in the form of vibrations called

• focus waves

• tidal waves

• elastic waves

• seismic waves