Why can geologists not predict earthquakes?
Foreshocks often don't register on seismographs.
Earthquakes depend on the weather, which is unpredictable.
Earthquakes are man made, not natural.
Activities along fault lines are unpredictable.
The movement of the ground due to rock breaking below the surface during an earthquake is known as _____.
ground heave
settlement
seismic activity
subsidence
What does it mean to say that the Richter scale is logarithmic?
Magnitude is cut in half for each step
There is ten-fold increase in ground shaking for each step
There is a ten-fold decrease for each step
Magnitude is doubled for each step
Which statement is FALSE about tectonic plates?
They sit on top of a fluid part of earth's interior.
They make up the earth's crust.
They fit together like puzzle pieces.
They have very specific movements.
What does the Richter scale measure?
The time and location an earthquake
The number of houses that are damaged
The amount of ground shaking and energy released.
The amount of ground shaking and energy of a volcano
A _____ is a machine that produces (a) _____.
seismogram, seismograph
seismograph, body wave
primary wave, secondary wave
seismograph, seismogram
The seismic waves that do most of the shaking are:
Rayleigh
Primary
Love
Body
How does fire danger increase during earthquakes?
Cities cannot afford enough firefighters to put them out.
There is not enough water available during large earthquakes
Fallen debris can be flammable, & electrical wiring.
Cities cannot afford enough firefighters to stop them.
What can you expect to happen after experiencing an earthquake?
You can assume that there will be no more earthquakes.
You should expect to feel aftershocks.
You should expect to feel foreshocks.
You can assume that geologists will be able to predict it.
Tsunamis are caused by earthquakes that occur _____.
underwater
in the Earth's core
in the plains
in the mountains
P-waves travel as _____ waves while S-waves travel as _____ waves.
horizontal, compressional
transverse, compressional
compressional, transverse
horizontal, transverse
Where is the epicenter of an earthquake found?
Underground, where the rock is breaking.
Underground, below the focus.
About a mile away from the focus.
Above ground, directly above the focus.
The elastic rebound theory explains how:
Fault slipping causes ground shaking.
Body waves travel faster than surface waves.
The epicenter is directly above the focus.
Ground shaking causes faults to slip.
An earthquake of Richter magnitude _____ produces 100 times more ground shaking than an earthquake of magnitude _____?
3,4
3,2
3,1
2,3
The magnitude of an earthquake is how _____.
fast its waves travel
long it lasts
much damage it does
big or strong it is
An earthquake of Richter magnitude _____ produces 100 times more ground shaking than an earthquake of magnitude _____?
3,2
3,1
3,4
2,3
What are the characteristics of an earthquake that make it so damaging?
Many cities do not have enough first responders.
Landslides and mudslides caused by earthquakes.
Cities can't afford to rebuild right away.
Earthquakes occur with little or no warning.
Which of the following choices describes a tsunami?
A portion of the ground that loosens and slides downhill
The shaking of the ground that liquefies water based soil
A huge sea wave resembling a large rising tide.
Buildings and roads on the Earth's surface that are shaken
Identify how liquefaction occurs during an earthquake.
Liquefaction occurs when a large ocean wave comes onto land.
Liquefaction occurs when the ground shaking loosens rock
Liquefaction occurs when ground shaking loosens moist soil
Liquefaction describes an effect such as ripples in a pond
Why do earthquakes occur?
Hurricanes
Climate change
Stress builds up around fault lines
Atmospheric pressure
How does a magnitude 4 earthquake differ from a magnitude 8 earthquake in regard to energy?
he magnitude 8 earthquake has 32,768 times energy
The magnitude 8 earthquake has 1,024 times the energy
The magnitude 8 has 1,048,576 times energy than the 4
The magnitude 8 earthquake has 128 times the energy
The point underground where the earthquake occurs is called the:
Aftershock
Foreshock
Focus
Epicenter