BJU Earth science chapter 6

A low frequency shock wave traveling through the earth.

Break in rock that just relieves stress but doesn't cause motion

Where do earthquakes happen the most in the US?

the fastest body wave

A crack in a rock where movement can occur.

What is the increments of the Richter scale?

Most earthquakes people are able to feel.

Body wave that can't travel through the earth's core

The center of earthquake activity

What is the dip angle?

What is the fault line?

Blocks move next to each other

A transform fault

Energy of an earthquake

An instrument that detects and records earth waves.

What is the fault's strike?

What can cause earthquakes?

Two plates moving towards each other.

Upper block moves above the lower block

Not all rocks respond the same way to strain.

Subduction occurs at what type of boundary?

The amount of energy by which one unit of Richter scale would increase.

Allow a material to change shape without breaking.

Secondary earthquakes are caused by

Point on the earth's surface above the center of earthquake activity

Where are earthquakes most common?

An instrument that simply measures earth waves

What is the fault plane/face?

A joint is a miniature fault.

Most destructive wave

Plates moving past each other.

Which scale is used to report earthquakes to the public?

Two plates moving away from each other.

A device that detects changes in motion and can graph it on a computer.

Upper block drops relative to the lower block

What is the surface between two sections of rock that move to form a fault.

Type of stress most significant in earthquakes.