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Earthquakes (Where do Earthquakes occur? (Most Earthquakes occur along the…
Earthquakes
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Mapping Earth's Interior
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Seismometer - Measures and records ground motion and can be used to determine the distance seismic waves travel
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- Find the arrival time difference.
- Find the distance to epicenter.
- Plot the distance on a map.
Seismic Waves
During an earthquake, a rapid release of energy along a fault produces seismic waves.
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Scientists use wave motion, wave speed, and the type of material that the waves travel through to classify seismic waves.
Primary Waves - causes particles in the ground to move in a push-pull motion. First waves. accordion motion. Weakest of 3 waves. Travels threw solids and liquids.
Secondary Waves - Second Waves. Are slower than P-waves. They cause particles to move up and down at right angles relative to the direction the wave travels. Perpendicular movement (snake). Slower moving wave, only travels through solids
Surface Waves - 3rd and last wave. Slowest Wave. Wave like movement. Cause particles in the ground to move up and down in a rolling motion. Most energy/damage.
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What are Earthquakes?
Earthquake - Are the vibrations in the ground that result from movement along breaks in Earth's lithosphere.
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The greater the force applied to a fault, the greater the chance of a large and destructive earthquake.
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