Earthquakes

What is the difference between a seismometer and a seismogram?

• A seismometer is the instrument that detects earthquake wave and a seismogram is the record of the earthquake.

• A seismometer is the record of an earthquake and the seismogram is the instrument that detects earthquakes.

• A seismometer records larger earthquakes and a seismogram records smaller quakes.

• There is no difference between a seismometer and a seismogram the terms can be used interchangeably.

What is the best description of the movement you saw when your group used the slinky to make a P-wave.

• The coils of the slinky stretched out and then stopped.

• The coils of the slinky bunched up and the the compressed coils appeared to travel down the length of the slinky and back.

• The coils of the slinky waved side to side like a snake.

• The coils of the slinky bunched and waved only part way down the length.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Which of the following statements is NOT true about P-wave.

• P-waves travel faster the S-waves.

• P-waves compress layers of rock as they pass through.

• P-waves cause an up and down movement to the earth as they pass through.

• P-waves do not travel through fluids, so they cannot be detected if they pass through the liquid core.

What is the best description of the movement you saw when your group used a slinky to model a S-wave.

• The coils of the slinky moved side to side up and down the length of the slinky, kind of like a snake.

• The coils of the slinky bunched up and the the compressed coils appeared to travel down the length of the slinky and back.

• The coils of the slink made curves up and down like ocean waves.

• The coils of the slinky did not seem to change shape at all.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Which of the following statements is NOT true about S-waves?

• S-waves are surface waves that move the ground from side to side.

• S-waves are the fasted and always come before P-waves.

• S-waves cannot travel through fluids.

• S-waves generally cause more damage during an earthquake.

How are the "focus" and "epicenter" of an earthquake related to one another? (Choose all correct answers. Hint more than 1)

• The focus is below ground and the epicenter is on earth surface.

• The epicenter is directly above the focus.

• The focus is the place under the epicenter where the energy of an earthquake is released.

• The epicenter is below ground and comes into focus on the surface.

• Both the epicenter and the focus are where the energy is released.

The earthquake recorded above was felt in the 3 cities shown. (Note that the the graph is showing the same time but different time zones.)

Mark ALL of the true statements about this earthquake that you can determine from the seismogram.

• The P-wave from this earthquake hit Sitka Alaska at 8:09 local time.

• The earthquake recorded occurred closer to Sitka than the other two cities

• Charlotte is the closest city to this earthquake.

• The time between the p-wave and the first s-wave in Honolulu is 6 minutes.

• The time between the P-wave and the S-wave at Charlotte was only 2 minutes.

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS3-2

During the 1964 earthquake in Alaska, the earthquake was "over" after the first shock.

• True

• False

During the 1964 Alaska earthquake, only 122 people lost their lives. This was remarkable because the earthquake was very strong (9.2 magnitude).

Which of the following is NOT a reason that the death count was low.

• Few people died because the earthquake occurred on a Holiday so there was no school and many businesses were closed.

• There were not many deaths due to the tsunami because the earthquake that triggered it was at low tide.

• Relatively few people were killed because the earthquake waves did not travel very far.

• There were fewer deaths because earthquake occurred in an area that was not densely populated.