EarthquakesIntroduction to Earthquakes

Aim, Learning Target and Agenda AIM:

How do I explain and illustrate what happens during an earthquake?

Learning Target: I can use explain and illustrate what happens during an

earthquake

Agenda Catalyst

Intro to C-squared

Earthquake footage

Earthquake vocab

Practice!

Do Now You have 4 minutes!

What is the name of the plate boundary where earthquakes usually occur? Divergent c. Convergent

Subducting d. Transverse

Arrows in the block diagram (at right) show the relative movement along a tectonic plate boundary. Between which two tectonic plates could this type of plate boundary exist?

Earthquake footage From a quake in California in 1989

http://video.nationalgeographic.com/video/player/environment/environment-natural-disasters/earthquakes/earthquake-montage.html

San Andreas Fault

Earthquake A natural, rapid shaking of the lithosphere

caused when rocks are displaced due to the release of energy stored in rocks; most caused by rapid movements along faults, but also associated with other events, such as volcanic eruptions.

Earthquakes occur at TRANSFORM boundaries

Some vocab!Fault – a crack in a landmass where

there has been displacement, shifting, ormovement of land on both sides

Focus - the place where an earthquake originates

Epicenter- the place on Earth’s surface lyingdirectly above the focus,or the origin of an earthquake

Energy builds up and is released in the form of...

Seismic waves – the energy waves given off by an earthquake. Also called earthquake waves.

Two types of seismic waves

P waves S waves

P for primary (meaning 1st)

S for secondary (meaning 2nd)

Faster Slower

Travels throiugh solid, liquids and gas

Travels through solids only

We can figure out information about the epicenter based on

seismograms.

Complete Practice Problems

What is the focus?  

What is the epicenter? 

Draw a picture that shows the focus, epicenter, and movement of the waves when an earthquake occurs. (Hint: draw a side view of the earth)

 How are P- and S-waves different?