Earthquake measurement

the place on Earth's surface directly above an earthquake's starting point

• seismograph

• seismogram

• epicenter

• focus

the tracing of earthquake motion made by a seismograph

• seismograph

• seismogram

• epicenter

• focus

the instrument located at or near Earth's surface that records seismic waves

• seismograph

• seismogram

• epicenter

• focus

the point inside Earth where an earthquake begins

• seismograph

• seismogram

• epicenter

• focus

What do seismologists use to determine when an earthquake began?

• an epicenter

• a seismogram

• a focus

• an intensity scale

What is probably the easiest way to find an earthquake's epicenter?

• the S-wave curve

• the P-wave curve

• the intensity scale

• the S-P time method

What kind of graph do seismologists use in the S-P time method?

• time-distance graph

• distance-intensity graph

• time-intensity graph

• time-strength graph

A scientist draws a circle around each of three seismograph stations to find what?

• a seismogram

• an earthquake's epicenter

• S waves

• P waves

What do seismologists use to measure earthquake strength?

• the Modified Mercalli Intensity Scale

• the S-P Time Scale

• the Richter magnitude scale

• the Earthquake Zone Scale

What is the measurement of the strength of an earthquake called?

• its intensity

• its richter

• its magnitude

• its frequency