Chapter 12: Earthquakes Study Guide
22 test answers
Unlock all answers in this set
Unlock answers 22question
body wave
answer
a seismic wave that travels through the body of a medium
Unlock the answer
question
moment magnitude
answer
a magnitude scale based on the size of the fault area that moves, how far fault blocks move, and the rigidity of rocks
Unlock the answer
question
surface wave
answer
a seismic wave that travels along the surface of a medium
Unlock the answer
question
modified Mercalli scale
answer
a scale that measures earthquake intensity
Unlock the answer
question
P wave
answer
Primary wave: the fastest seismic wave, can travel through solids, liquids and gases, the first wave seismographs pick up
Unlock the answer
question
S wave
answer
Secondary wave: second fastest wave,can only travel through solids
Unlock the answer
question
Tsunami's can be caused by
answer
volcanic eruptions, undersea landslides and undersea earthquakes
Unlock the answer
question
Tsunami's are not caused by
answer
tornados
Unlock the answer
question
This is what you should do if you are indoors (with no reasonable exit) during an earthquake
answer
crouch under a desk
Unlock the answer
question
Focus
answer
this is the location of the first motion of an earthquake (also known as the hypocenter)
Unlock the answer
question
foreshock
answer
a small earthquake
Unlock the answer
question
Epicenter
answer
the point on Earth's surface directly above the earthquake's focus
Unlock the answer
question
What may happen to a building during an earthquake
answer
it may sway or collapse
Unlock the answer
question
How do scientists find the epicenter of an earthquake
answer
by comparing the arrival times of P waves and S waves at several seismograph stations
Unlock the answer
question
This is how to succeed
answer
study, ask questions, be responsible and complete your tasks
Unlock the answer
question
What do we study to help forecast earthquakes?
answer
seismic gaps, foreshocks, rock changes
Unlock the answer
question
Why do earthquakes usually occur at plate boundaries?
answer
Rock in environments near tectonic plate boundaries experience great stress.
Unlock the answer
question
What is the epicenter of an earthquake?
answer
the point on Earth's surface directly above the earthquake's focus
Unlock the answer
