Earthquake-INTENSITY VS MAGNITUDE

What does magnitude measure?

• The effects on people and structures

• The energy released at the source of an earthquake

• The distance to the epicenter

• The duration of ground shaking

What does intensity measure?

• The size of seismic waves on a seismogram

• The energy released during an earthquake

• The strength of shaking at a specific location

• The depth of the earthquake's hypocenter

Who developed the magnitude scale for measuring earthquakes?

• Charles Darwin

• Charles Richter

• Chang Heng

• Alfred Wegener

What two factors are used to calculate Richter magnitude?

• Time and distance to the epicenter

• Maximum amplitude and distance to the epicenter

• Intensity and shaking duration

• Ground displacement and frequency

Which tool records the motion of the ground during an earthquake?

• Seismometer

• Seismogram

• Seismograph

• Seismoscope

The earliest earthquake-recording device, invented in A.D. 132, was called:

• Seismograph

• Seismometer

• Seismoscope

• Richter scale

What is recorded on a seismogram?

• Ground displacement over time

• The magnitude of an earthquake

• The intensity of shaking

• The depth of the hypocenter

On a seismogram, the horizontal axis represents:

• Time

• Ground displacement

• Intensity

• Distance

What is the highest observed magnitude of an earthquake based on seismograph measurements?

• 7.5

• 8.9

• 9.5

• 10

What does the Modified Mercalli Intensity Scale measure?

• The energy released by the earthquake source

• The strength of shaking at specific locations

• The depth of the earthquake

• The frequency of seismic waves