Science Chapter 9 Lesson 1

Seismic waves change speed and direction as they travel through earth's interior. S-waves do not travel through earth's outer core because it is liquid.

Describe earth's interior.

An earthquake focus is a location inside earth and epicenter is the location on earth's surface directly above the earthquake's focus.

Distinguish between an earthquake focus and an earthquake epicenter.

moves up and down in a rolling motion. It's wave property?

SURFACE WAVE

1000

Approximately how much more energy is released in a magnitude 7 earthquake compared to a magnitude 5 earthquake?

California, Oregon, Washington, Alaska

Identify areas in the US that have the highest earthquake risk.

forces pull two blocks of rock apart. The block of rock above the fault moves down relative to the block of rock below the fault. The location is divergent plate boundaries.

Normal

has a push-pull motion. It's wave property ?

Primary wave

forces push two blocks of rock together. The block of rick above the fault moves up relative to the block of rock below the fault. The location is convergent plate boundaries.

Reverse

moves up and down at right angles. It's wave property ?

SECONDARY WAVE

two blocks of rock slide horizontal past each other in opposite directions. The location is transform plate boundaries

Strike slip

Seismologists use an instrument called a seismometer and the ground motion is recorded on a seismogram.

Use the terms "seismogram" and "seismometer" in a sentence.

26

What is the value of Roman numeral XXVI?

seismogram

What measurements would you make to evaluate earthquake risk in your hometown.