EARTHQUAKE

Front

_____________ is a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.

Back

earthquake

Front

__________________is the study of earthquakes and seismic waves that move through and around the earth.

Back

Seismology

Front

The point within the earth where rock is under stress and where earthquake originates is called _________________________.

Back

Focus

Front

The point directly above the focus on the surface is called ___________________.

Back

Epicenter

Front

__________is a thin zone of crushed rock separating blocks of the earth's crust.

Back

Fault

Front

An instrument used to detect and record earthquakes is called _______________.

Back

Seismograph

Front

_______________is a measure of the “size,” or amplitude, of the seismic waves generated by an earthquake source and recorded by seismographs.

Back

magnitude

Front

_________________is a number (written as a Roman numeral) describing the severity of an earthquake in terms of its effects on the earth's surface and on humans and their structures.

Back

intensity

Front

What scale measures the strength of shaking produced by an earthquake and its effects on people, structures, and the environment?

Back

Mercalli scale

Front

Magnitude is measured using __________ scale and determined from measurements on seismographs.

Back

Richter scale