Understanding Earthquake Measurement Scales

Mr. Stano introduces the anatomy of earthquakes and the tools used to record them, such as seismographs and seismograms. He explains how triangulation helps find an earthquake's epicenter using data from three seismographs. The video covers two scales for measuring earthquakes: the Meral scale, which assesses intensity based on observed damage, and the RoR scale, which measures magnitude based on energy release. The video concludes with a brief mention of seismic waves, to be discussed next time.

What is the primary purpose of a seismograph?

• To detect volcanic eruptions

• To record the size and magnitude of earthquakes

• To measure the temperature of the Earth's core

• To predict future earthquakes

How many seismographs are needed to accurately locate an earthquake's epicenter?

• Four

• Three

• Two

• One

What is the process called that uses three seismographs to find an earthquake's epicenter?

• Bisection

• Triangulation

• Interpolation

• Quadrangulation

Which scale measures earthquake intensity based on observed damage?

• Seismic scale

• RoR scale

• Merali scale

• Richter scale

What is the range of the Merali scale?

• 1 to 10

• 1 to 12

• 1 to 15

• 1 to 20

Why might a massive earthquake score low on the Merali scale?

• Because it causes little observable damage

• Because it occurs in a densely populated area

• Because it is detected by only one seismograph

• Because it releases a lot of energy

What does the RoR scale measure?

• The depth of the earthquake

• The duration of an earthquake

• The speed of seismic waves

• The magnitude of an earthquake

How does the RoR scale represent an increase in magnitude?

• As a tenfold increase

• As a hundredfold increase

• As a linear increase

• As a logarithmic increase

What is the energy release difference between a 3.0 and a 2.0 earthquake on the RoR scale?

• Ten times as much

• Twenty times as much

• Twice as much

• Five times as much

Which scale would likely show a higher reading for an earthquake in a remote area with little damage?

• Merali scale

• RoR scale

• Neither scale

• Both scales equally