BJU Earth science chapter 6

Energy of an earthquake

Most destructive wave

Subduction occurs at what type of boundary?

Secondary earthquakes are caused by

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

Most earthquakes people are able to feel.

A crack in a rock where movement can occur.

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

A joint is a miniature fault.

Which scale is used to report earthquakes to the public?

An instrument that simply measures earth waves

What is the dip angle?

What is the fault line?

A low frequency shock wave traveling through the earth.

Where are earthquakes most common?

Not all rocks respond the same way to strain.

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

Blocks move next to each other

Plates moving past each other.

Upper block moves above the lower block

Two plates moving towards each other.

What can cause earthquakes?

What is the fault's strike?

Upper block drops relative to the lower block

Two plates moving away from each other.

A transform fault

the fastest body wave

Allow a material to change shape without breaking.

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

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

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

The center of earthquake activity

Type of stress most significant in earthquakes.

What is the increments of the Richter scale?

What is the fault plane/face?

Where do earthquakes happen the most in the US?

An instrument that detects and records earth waves.