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Chapter 8 Earthquakes and Earth's Structure

Across
The point on the surface directly above the focus
Expresses the energy released in an earthquake based on a calculation using the height of the largest earthquake body wave recorded on a specific type of seismograph
When pore pressure rises enough that they are no longer held together by frictional forces and loses its shear strength and behaves like fluids
Waves that arrive second to an observer
The boundary between the crust and mantle
A fracture when rock on either side of the fracture ruptures and the two sides move relative to one another
Small earthquakes that precede large quakes
Waves that travel through Earth's interior and carry some energy from the focus to the surface
The region in a subduction zone where earthquakes occur
Down
When rocks on opposite slip past one another at a continuous, snail-like pace
The initial rupture point, where abrupt movement creates an earthquake, typically lies below the surface
A fault that is vertical and the rocks on each side move horizontally
Expresses the energy of an earthquake through a calculation involving the amount of movement and the surface area and the shear strength of faulted rock
Travel fast and are the first waves to reach an observer
Waves that travel through rock
A sudden motion or trembling of Earth caused by he abrupt release of elastic energy that is stored in rocks.
Waves that radiate from the epicenter and travel along Earth's surface
Sea waves produced by an earthquake