Forces in the crust
Earthquakes and Seismic Waves
Monitoring Earthquakes
Earthquake Safety
Earthquacks
100
what type of stress happens when 2 plates push together?
compression
100
what is the fastest type of seismic wave?
a P-wave
100
what do seismographs measure?
They measure the size an duration of seismic waves.
100
should you leave heavy objects above your bed?
NO!!!!!
100
where was the 1906 earthquack?
San Francisco.
200
what are the names of the walls on a normal or reverse faults?
Foot wall and hanging wall
200
how many times stronger is an 8 magnitude earthquake than a 6 magnitude earthquake on the Richter scale?
100 times stronger.
200
how does a seismograph work?
with a pen that is stationary due to it being connected to a heavy weight while the paper is attached to the moving earth.
200
what do you do in the case of an earthquake?
Drop, cover and hold.
200
how many earthquacks happen each day?
Thousands.
300
how does a block mountain form?
2 normal faults form next to each other with their foot walls in the center.
300
what type of scale do scientists use to measure earthquakes?
The Moment Scale.
300
what does a tiltmeter measure?
It measures the tilt of the ground.
300
what can happen when there is an earthquake under a large body of water?
Tsunami!!!!
300
what killed the most people in the Fukushima earthquack in Japan?
The tsunami.
400
name 3 types of stress.
compression, tension, shearing
400
how do you tell your distance from the epicenter of an earthquake?
the longer the time between the P-wave and the S-wave, the farther you are from the epicenter.
400
how do we tell where faults are?
by using seismographs to measure where seismic waves reflect off faults
400
What do you call an earthquake that happens after a major earthquake?
An aftershock.
400
where was the strongest earthquack?
Chile.
500
what are anticlines and synclines?
when plates move and wrinkle the crust, anticlines are where the crust goes up and synclines are where it goes down.
500
Seismic waves carry energy from the _____(1) through the earth's ______(2) along the _______(3).
1. focus 2. interior 3. surface
500
what does a creep meter measure?
It measures the horizontal movement of the ground.
500
Where in the United States of America are earthquakes most common?
The West Coast.
500
where was the earthquack with the most deaths?
CHINA.
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