1 Seismic Profiles of Earth’s Interior Objective: Use seismic waves to determine the nature of Earth’s interior layers Scientists learn about Earth’s interior by using seismic waves or vibrations that travel through Earth’s layers during earthquakes. There are different types of seismic waves. P waves (Primary waves) are compressional vibrations that travel accordion style through solids and liquids. S waves (Secondary waves) are transverse. They travel in a snake-like fashion, but only through solid mediums. Surface waves travel in a variety of methods, but only along the solid crust. Seismic waves change speed and angle as they move through different mediums. In general, seismic waves travel faster through solids or rigid densely packed materials.
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1
Seismic Profiles of Earth’s Interior
Objective: Use seismic waves to determine the nature of Earth’s interior layers
Scientists learn about Earth’s interior by using seismic waves or vibrations that travel through Earth’s layers during earthquakes. There are different types of seismic waves. P waves (Primary waves) are compressional vibrations that travel accordion style through solids and liquids. S waves (Secondary waves) are transverse. They travel in a snake-like fashion, but only through solid mediums. Surface waves travel in a variety of methods, but only along the solid crust.
Seismic waves change speed and angle as they move through different mediums. In general, seismic waves travel faster through solids or rigid densely packed materials.
Crust
Mantle
Solid ironinner core
Liquid ironouter core
Radius = 6370 km
Distance to core is ~1/2 the radius (2900 km depth)