Epicenter

What method do seismologists use in locating an epicenter?

• Focus Group Discussion

• Interview

• Observation

• Triangulation

As the distance from the epicenter decreases, the time interval between the arrival of the P-waves and the S-waves on the seismograph will _________________

• decrease

• increase

• remain the same

• zero

Where is the epicenter for this earthquake located based on triangulation?

• A

• B

• C

• D

Which of the statements best describes the relationship between lag time and distance from epicenter? 

• The longer the lag time, the closer the distance.

• The longer the lag time, the farther the distance. 

• The shorter the lag time, the farther the distance. 

• There is no relationship. 

How is the epicenter of an earthquake determined?

• By measuring the amplitude of seismic waves

• By calculating the difference in arrival times of P-waves and S-waves at multiple seismic stations

• By observing the damage pattern near the earthquake zone

• By tracking the aftershock sequence

An Earthquake that occurs 500 km away and has surface wave amplitude of approximately 200 mm has a magnitude of ​ (a)  

• 7.0

• 5.0

• 8.0

• 7.5

• 6.0

• 4.7

• 6.7

• 9.2

• 5.5

Tags

NGSS.MS-ESS3-2

How many seismograph stations are used to triangulate the epicenter?

• 1

• 2

• 3

• 4

Which of the following describes the epicenter of an earthquake?

• The location where the energy of the earthquake travel.

• The location where motion in an earthquake is detected last.

• The point on Earth’s surface directly above the earthquake’s focus

• The location along a fault where the first motion of an earthquake occurs.

Tags

NGSS.MS-ESS3-2

Which of the following statement correctly identifies the focus and epicenter of an earthquake in the given illustration?

• Point A is the focus and Point B is the epicenter.

• Point A is the epicenter and Point C is the focus

• Point A is the epicenter and Point B is the focus.

• Point A is the focus and Point C is the epicenter.

Tags

NGSS.MS-ESS3-2

Which of the following statements is TRUE about the focus and epicenter of an earthquake?

• The focus is the point on the surface directly below the epicenter while epicenter is the point where fault “slip” is initiated.

• The focus is the point on the surface directly above the epicenter while epicenter is the point where fault “slip” is initiated

• The focus is the point where fault “slip” is initiated while epicenter is the point on the fault directly beneath the focus

• The focus the point where fault “slip” is initiated while epicenter is the point on the surface directly above the focus.