Point beneath Earth's surface where rock that is under stress reaches it's elastic limit, and breaks to form an earthquake. Seismic waves begin here.
Epicenter
Place above the focus point, on Earth's surface. Most of the damage occurs here.
Seismic Waves
Waves that travel in all directions, they carry the energy released from and earthquake. (P-waves, S-waves, surface waves)
P-Waves
These are the fastest moving waves, and the first to arrive. The motion compresses and expands like an accordion. Travel through both liquid and solid.
S-Waves
Second wave to arrive, moves up and down/side to side. Can only move through solids.
Surface Waves
Slowest moving waves, moves like an ocean wave (a rolling motion). These can cause the most damage.
Seismograph
Instrument that registers seismic waves, as well as the times each wave arrives.
Magnitude
The measure of how much energy is released during an earthquake.
Intensity
Measure of how much damage is caused by an earthquake. This is a written description.
Mercalli Scale
Used to measure earthquake intensity by describing the damage. Uses roman numerals.
Moment Scale
Used to measure magnitude of an earthquake of any size of distance. This is the most widely used scale.
Richter Scale
Used to measure magnitude of earthquakes that are small and near the recording center. This is an outdated scale.
Liquefaction
When the shaking of an earthquake turns loose soil into liquid mud, and the ground gives way causing building to collapse.
Tsunami
Very large waves produced when a fault in the ocean suddenly moves downward. (convergent boundary)
Foreshocks
Smaller earthquakes the occur before a major earthquake.
Aftershocks
Smaller earthquakes that can occur up to months after a major earthquake.
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renniagarcia93
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Answers & Comments
HERES THE DESCRIPTION
Focus Point
Point beneath Earth's surface where rock that is under stress reaches it's elastic limit, and breaks to form an earthquake. Seismic waves begin here.
Epicenter
Place above the focus point, on Earth's surface. Most of the damage occurs here.
Seismic Waves
Waves that travel in all directions, they carry the energy released from and earthquake. (P-waves, S-waves, surface waves)
P-Waves
These are the fastest moving waves, and the first to arrive. The motion compresses and expands like an accordion. Travel through both liquid and solid.
S-Waves
Second wave to arrive, moves up and down/side to side. Can only move through solids.
Surface Waves
Slowest moving waves, moves like an ocean wave (a rolling motion). These can cause the most damage.
Seismograph
Instrument that registers seismic waves, as well as the times each wave arrives.
Magnitude
The measure of how much energy is released during an earthquake.
Intensity
Measure of how much damage is caused by an earthquake. This is a written description.
Mercalli Scale
Used to measure earthquake intensity by describing the damage. Uses roman numerals.
Moment Scale
Used to measure magnitude of an earthquake of any size of distance. This is the most widely used scale.
Richter Scale
Used to measure magnitude of earthquakes that are small and near the recording center. This is an outdated scale.
Liquefaction
When the shaking of an earthquake turns loose soil into liquid mud, and the ground gives way causing building to collapse.
Tsunami
Very large waves produced when a fault in the ocean suddenly moves downward. (convergent boundary)
Foreshocks
Smaller earthquakes the occur before a major earthquake.
Aftershocks
Smaller earthquakes that can occur up to months after a major earthquake.