Show:
Earthquake Basics
Measurement
Hazards
Earth's Layers
Grab Bag
100
Vibration of earth caused by a rapid release of energy.
What is an Earthqake?
100
Waves that compress and expand particles as they move through Earth.
What are P waves?
100
The most obvious cause of earthquake damage, mostly involves surface waves.
What is seismic shaking?
100
Innermost composition layer of Earth, composed of the same material as meteorites.
What is the Core?
100
An area along a fault where no earthquake activity has occurred for some time.
What is a seismic gap?
200
A fracture in Earth where movement has occurred.
What is a fault?
200
Waves that shake particles at right angles; also known as "transverse" waves.
What are S-waves?
200
When stable ground becomes saturated with water and cannot support buildings.
What is liquefaction?
200
Layer of semi-melted rock which is responsible for the moving of earth's plates.
What is the Asthenosphere?
200
Graph used to calculate distance between a seismograph and the epicenter.
What is a travel-time graph?
300
The place on the surface of earth above where the earthquake starts.
What is the epicenter?
300
The machine used to amplify and record ground motion.
What is a seismograph?
300
When soil and rocks slide down a slope.
What is a landslide?
300
Physical liquid layer responsible for Earth's magnetic field.
What is the outer core?
300
The actual paper or computer record of ground shaking.
What is a seismogram?
400
The point within Earth where an earthquake starts
What is the focus?
400
The familiar but outdated logarithmic scale used to measure earthquakes.
What is the Richter scale?
400
A large destructive seismic wave.
What is a tsunami?
400
Sphere of rock which consists of the crust and top layer of the upper mantle.
What is the Lithosphere?
400
Major area of seismic activity, also called the "ring of fire."
What is the circum-Pacific Belt?
500
The idea that earthquakes are produced by the rapid release of energy stored in rock which has been subjected to great forces.
What is the Elastic Rebound Hypothesis?
500
The most commonly used scale today, uses displacement, area of break, and strength of material to calculate energy released by earthquake.
What is the Moment Magnitude Scale?
500
Knowing safety procedures, building safer buildings, and tsunami warning systems in coastal areas.
What are ways to reduce earthquake damage?
500
A wave which does not travel through the outer core, which helped us realize that the outer core was liquid.
What is an S wave?
500
Boundary between the crust and the mantle.
What is the Moho Boundary?