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Tejal Patel

on 23 May 2016

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Transcript of Earthquakes

Earthquake Hazards
What is an earthquake?
Seismic Waves
-waves of energy produced at the focus of the earthquake
Recording Seismic Waves By Using Seismographs
records size, direction, time, and arrival times of P and S-Waves
modern seismographs record the ground motion with electronic signals
designed to record either vertical or horizontal ground movement
Types of Seismic Waves

By: Tejal Patel, Vivian Wang, Veronika Orlovska, and Ian Britton
It's ok. Don't be so sad that our presentation is over...
Because it's not.
How are earthquakes measured?
Quiz Time!!!
a sudden rupture or movement of rocks on a fault
a fault ruptures when rocks are strained and they can no longer stretch or bend
the record of seismic waves
used to calcuate size and location of earthquakes
records the ground motion

Question #1
Question #2
Question #3
Question #4
Question #5
What are the three types of seismic waves?
How are earthquakes measured?
What are four earthquake hazards?
What are seismographs?
What is an earthquake?
Thanks for watching, we hope you enjoyed our Presentation.
Magnitude Scale
Richter Magnitude Scale
Moment Magnitude Scale
Modified Mercalli Scale
Measuring an Earthquake's Size
Earthquakes and Plate Boundaries
When rocks along the fault rupture they sends waves
Elastic strain energy are released from the rocks
Earthquakes start at a focus
Plate boundaries are what create faults and earthquakes
Several types of plate boundaries
Earthquakes occur when there is strain on rocks on faults
Primary Waves
- compressional waves
- causes particles in rock to move back and forth
Secondary Waves
- shear waves
- causes particles in rock to move perpendicular to the wave
Surface Waves
- travel along surface of earth
- slowest type of wave

can cause a flammable item to fall over
gas pipes can rupture
electric wires can rip
When an earthquake occurs there are many hazards such as fires, landslides, liquefaction, and tsunamis

weak points crumble and fall
destroys houses, block roads, disrupt gas pipes, and electric lines
causes a extremely high water pressure in the soil
causes the soil to be more like a liquid than a solid.
sudden upward or downward movement
causes a giant wave called a tsunami.
can devastate a large region
Full transcript