6.1 Forces in Earth’s Crust
Name the 3 types of Stress
Tension, Compression, Shearing
What is an earthquake?
An earthquake is a shaking and trembling that results from the movement of rock beneath the earth surface.
what is a tiltmeter?
A tiltmeter measures, tilting or raising of the ground
Geologist can determine earthquake risk by doing what?
locating where faults are active, and were past earthquakes have occurred
What has to be broken before you can use it?
An egg
What are the 3 kinds of faults?
Normal fault, Reverse fault, Strike-slip fault
What is a Focus?
Focus is the area beneath earth's surface, where the rock that is under stress breaks triggering an earthquake
What is a Creep meter?
A creep meter uses a wire stretched across a fault to measure horizontal movements of the ground
How do earthquakes cause damage?
it can cause great damage cause of earthquakes damage include shaking liquefaction, aftershock, and tsunami
I’m tall when I’m young, and I’m short when I’m old. What am I?
A candle
what is Syncline?
A fold in rock that bends downward to form a valley
What is the Epicenter?
The point on the surface directly above the focus is called the epicenter
What is a Laser ranging device?
A laser ranging device uses a laser beam to detect horizontal fault, movements, the device times a laser beam as a travels to a reflector and back
How is shaking produced?
The shaking produced by seismic waves can trigger landslides or avalanches shaking can also damage or destroy buildings and bridges
What is full of holes but still holds water?
A sponge
what is an anicline?
A a fold in rock that bends upward into an arch
What are the 3 types of seismic waves?
P waves
S Waves
Surface waves
How are GPS Satellites used during an earthquake?
Scientist can monitor changes in elevation as well as horizontal movements along faults using a network of earth, orbiting satellites, called the global positioning system, which was developed to help ships and planes.
What can cause a tsunami?
When an earthquake jolts the ocean floor plate movement causes the ocean floor to rise slightly and push water out of its way. The water displaced by the earthquake may form a large wave called a tsunami.
What question can you never answer yes to?
Are you asleep yet?
What is a Plateau?
A large area of flat land elevated high above sea level, some plateaus form when forces in earth's crust push up a large flat block of rock
what does the Moment magnitude scale do?
The moment magnitude scale is a rating system that estimates the total energy released by the earthquake
What is Friction?
Friction is the force that opposes the motion of one surface as it moves across another surface.
Name ways we can stay safe from an earthquake?
over you head, get under a table, if you are outside stay away from trees, go to a field.
Create safer building, make utilities safer
What is always in front of you but can’t be seen?
The future