this stress force pulls on the crust and stretches the rock so it becomes thinner in the middle
What is tension?
100
This type of waves carry energy from an earthquake away from the focus, through Earth's interior, and across the surface.
What are seismic waves?
100
the measure of how strong an earthquake is known as its
What is magnitude?
100
this word means to study closely
What is monitoring?
100
this is the best way to protect yourself from falling objects and flying glass
What is drop,cover, and hold?
200
This stress force squeezes rock until it folds or breaks.
What is compression?
200
These seismic waves arrive first and compress and expand the ground like an accordion. They damage buildings
What are primary waves or p waves?
200
The device that records and measures seismic waves is called
What is seismograph?
200
this device measures vertical movment and the tilting or raising of the ground
What is a tiltmeter?
200
why when you are indoors, you crouch under sturdy items and cover your head and neck with your arms
What is avoiding things that might fall?
300
This stress force pushes a mass of rock in two opposite directions and causes rocks to break and slip apart and/or change their shape.
What is shearing?
300
These seismic waves come after the first set of waves and cannot travel through liquids.They vibrate side to side and up and down.
What are s waves?
300
this rating scale has 12 steps and rates earthquakes on the level of damage at a given place
What is a Mercalli scale?
300
This device measures horizontal movement and uses a wire stretched across a fault to measure the horizontal movement of the ground
What is a creep meter?
300
when you are outdoors and you sit down during an earthquake why do you do this
What is to avoid being thrown down?
400
When the two plates are moving apart this type of stress force takes place.
What is tension force?
400
These seismic waves produce severe ground movements and can make the ground roll like ocean waves.
What is surface waves?
400
this a rating scale that is the earthquake's magnitude based on the size of the earthquake's seismic waves
What is richter scale?
400
this device uses a laser beam to detect horizontal fault movement by the time it takes the laser beam to a reflector and back.
What is a laser ranging device?
400
Often these come down or break during earthquakes causing power outages, explosions or fires.
What is water mains , power lines, and gas mains?
500
one plate pushing against the other and squeezing rock into smaller parts
What is compression force?
500
This type of seismic waves can travel through both liquids, and solids
What is primary waves, or P waves?
500
geologists use this rating system to estimate the total energy released by an earthquake
What is a moment magnitude scale?
500
these devices use this device to measure changes in elevation and tilt of the land as well as horizontal movement along a fault. they can also be used to locate points and help ships and planes find their routes.
What is a GPA satellite?
500
When the ground gets too much moisture, and shakes the loose soil and it turns into mud, causing buildings to sink