EARTHQUAKE

S

BY: Real Daisy

Flores Michelle

Arandia Sophia

What is an Earthquake?

Earthquakes are vibrations of the

earth.

Shaking of Earth's crust a forceful

trembling of the Earth's crust that

causes damage to edifices.

They are also

called, quake, tremor, temblor.

What Causes an Earthquake?

Earthquakes are outcomes of the rapid release of tectonic pressure through the fault line or volcanic activity.

When the earth releases energy in the earth’s crust, it creates seismic waves, which causes an earthquake.

An earthquake is a great shaking of Earth's surface. It is caused by the cracking and shifting of the platesis of rock that make up the planet's layered crust

P & S WAVES

There are different kinds of seismic waves, &

they all move in different ways. The 2 main

kinds of waves are ‘body waves’ and ‘surface

waves’.

P & S waves are considered ‘body waves’

Earthquakes create several kinds of seismic

waves including P, for "Primary" and S, for

"Secondary" waves.

For a better understanding you can visit:this

website with visual representations

P Waves

A P wave, or compressional wave, is a seismic

body wave that shakes the floor back and forth

like a coil

P waves are the fastest kind of seismic

wave, and therefore, the first to be recorded on

a seismograph.

P waves can move through solid rock and

fluids,(like water or the liquid layers of the

earth). It pushes and pulls the rock it moves

through; just like sound waves can push and

pull the air

S Waves

An S wave, or shear wave, is a seismic body

wave that shakes the ground back and forth

(perpendicular) to the direction the wave is

moving.

The second wave you feel in an earthquake is

called an S wave .

S waves are much more slower than P waves.

They can only go through a solid , not through

any liquid.

S waves move in a more shear motion

Largest Earthquakes in

California

Fort Tejon, California: Magnitude 7.9:

01/09/1857

San Francisco, California : Magnitude 7.8 :

04/18/1906

Imperial Valley, California : Magnitude 7.8 :

02/24/1892

Owens Valley, California : Magnitude 7.4 :

03/26/1872

Landers, California : Magnitude 7.3 :

06/28/1992

After Shock

After a large earthquake occurs, there is still a

danger and possibility of an after shock hitting.

After Shock: a smaller earthquake, sometimes

one of many, that follow a large scale

earthquake.

After Shocks occur because even though the

tension with the 2 plates is released, their

edges need to adjust to new positions. These

edges will not always be able to pass each

other smoothly, and this readjustment

generates smaller shocks.

Fault Lines