Earthquakes

The epicenter of an earthquake is

• The point below the surface where rock begins to break and the first motion occurs
• The seismic station closest to the earthquake
• The place where the greatest damage occurs
• The point on the surface directly above the focus

The Richter Scale measures:

• the amount of radon gas released

• the movement of rock at a fault line and the actual magnitude

• the magnitude of an earthquake as measured at a seismic station

• the intensity of an earthquake

The Modified Mercalli Scale rates the amount of damage from an earthquake

• true
• false

Which travels fastest, always arriving first at a seismograph?

• P waves

• S waves

• Body waves

An earthquake scored high on the Richter scale but low on the Mercalli scale. Why?

• it probably happened in an area with no people
• it was a fast and shallow earthquake

• because it damaged a lot
• impossible to tell

Liquefaction is when...

• the soil behaves like liquid due to an earthquake's shaking and squeezing forces

• seawater is forced onto land by an earthquake

• magma rises to the surface due to an earthquake's shaking and squeezing forces

• buildings are damaged, crumbling like liquid

Tags

NGSS.MS-ESS3-2

Which of the following amplifies the S waves during an earthquake?

• Loose, unconsolidated underlying soil

• Strong, rigid rocks underground

• Closeness to a volcano
• Altitude of the epicentre

Tags

NGSS.MS-PS4-2

An instrument that detects and measures earthquakes is a 

• seismogram
• focus seismic map
• focus
• seismograph 

Tags

NGSS.MS-ESS3-2

How much bigger is a magnitude 8 earthquake compared to magnitude 6 one on the Richter Scale?

• 1 time bigger

• 10 times bigger

• 100 times bigger

• 1000 times bigger

The place on the Earth's surface, above the origin of the earthquake.

• Epicenter

• Focus

• Surface

• Crust

Tags

NGSS.MS-ESS3-2