Save
or

or

taken

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

focusNode
Didn't know it?
click below

Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size     Small Size show me how

# Chapter 19 Vocab

### Vocab

TermDefinition
Stress Forces per unit area that act on a material- compression,tension, and shear
Strain deformation of materials in response to stress
Elastic Deformation Causes materials to bend and stretch; proportional to stress, so if the stress is reduced or returns to zero the strain or deformation is reduced or disapears
plastic deformation Permanent deformation caused by strain when stress exceeds a certain value
Fault Fracture or system of fractures in earth's crust that occurs when stress is applied too quickly or stress is too great
Seismic waves The vibrations of the ground during an earthquake
Primary waves seismic wave that squeezes and pushes rocks in the same direction that the wave travels, know as a p-wave
Secondary waves Seismic wave that causes rock particles to move at right angles to the direction of the wave, known as an s-wave
Focus Point of the initial fault rupture where an earthquake originates that usually lies at least several kilometers beneath earth's surface
Epicenter Point on earth's surface directly above the focus of an earthquake
Seismometers instrument used to measure horizontal or vertical motion during an earthquake
Seismogram Record produced by a seismometer that can provide individual tracking of each type of seismic wave
Richter Scale Numerical rating system used to measure the amount of energy released during an earthquake
Magnitude Measure of energy released during an earthquake, which can be described using richer scale
Amplitude The size of the seismic waves; an increase of 1 in the scale represents an increase in amplitude of a factor of 10
Moment Magnitude Scale Scale used to measure earthquake magnitude- taking into account the size of the fault rupture
Modified Mercalli scale Measures earthquakes intensity on a scale from 1 to 10
Soil Liquefaction Process associated with seismic vibrations that occur in areas of sand that is nearly saturated;resulting in the ground behaving like liquid
Tsunami Large powerful ocean wave generated by the vertical motions of the seafloor during an earthquake
Seismic Gaps place along an active fault that has not experienced an earthquake for a long time
Created by: Deonna2014

Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

• SPACEBAR - flip the current card
• LEFT ARROW - move card to the Don't know pile
• RIGHT ARROW - move card to Know pile
• BACKSPACE - undo the previous action

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
 "Know" box contains: Time elapsed: Retries:
restart all cards