landform geohazards

1. By
Ryan Faircloth
Before and After

2. What happens during an earthquake?
• Tectonic plates fold either under or over one another causing the ground
to crack and crumble. They also could start a tsunami.
• An earthquake is the sudden, rapid shaking of the earth, caused by the
breaking and shifting of subterranean rock as it releases strain that has
accumulated over a long time.

3. How it is hazardous to humans
• It could cause lots of damage to their homes, personal items,
pets and their entire cities.
• Serious injury or even dead.

4. In What Areas do Earthquakes Occur
Most Often?
• Earthquakes occur most where there are lots
of plates and plate movement which is mostly
near the mountains.

5. How is an earthquake measured?
• A Richter Scale, (left) developed by Charles F. Richter in 1934, used a formula
based on amplitude showing how powerful the waves are that the shaking
produces.
• Seismometers (right) are instruments that measure motions of the ground.
Records of seismic waves.

6. Devastating Earthquakes 1 of 2
• The 2004 Indian Ocean Earthquake
• Sunday, December 26, 2004.
• It was an undersea earthquake, killing over 230,000 people in fourteen
countries.
• With a magnitude of Mw 9.1–9.3, it is the third largest earthquake ever
recorded on a seismograph.
• The earthquake had the longest duration of faulting ever observed,
between 8.3 and 10 minutes.

7. Devastating Earthquakes 2 of 2
• The 2010 Chile earthquake
• Saturday, February 27, 2010.
• Occurred off the coast of central Chile.
• Magnitude of 8.8 on the moment magnitude scale.
• Intense shaking lasting for about three minutes.
• It ranks as the sixth largest earthquake ever to be recorded
by a seismongraph It was felt strongly in six Chilean regions
that made up about 80 percent of the country's population.

8. Earthquake Protection
• "Drop, Cover, and Hold On" Drop to the floor, take cover under a sturdy desk or
table, and hold on to it firmly. Be prepared to move with it until the shaking stops.
• Build an emergency kit and make a family communications plan.
• Fasten shelves securely to walls. Place large or heavy objects on lower shelves.
Store breakable items such as bottled foods, glass, and china in low, closed
cabinets with latches

9. SOURCES
• Ready.gov
• http://www.earthquakecountry.info/roots/ste
p5.html
• http://www.onlinecolleges.net/10-most-devastating-
earthquakes-of-all-time/
• http://en.wikipedia.org/wiki/Seismometer