Earthquakes - Lacey Abbott

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Earthquakes:

Earthquakes Submitted To: Mr. Stirling Submitted By: Lacey Abbott

What is an Earthquake?:

What is an Earthquake? An earthquake is the result of a sudden release of energy in the Earth’s crust that creates seismic waves. It is the shaking of ground caused by the sudden breaking and movement of large sections (tectonic plates) of the earth's rocky outermost crust. The edges of the tectonic plates are marked by faults (or fractures). Most earthquakes occur along the fault lines when the plates slide past each other or collide against each other.

Common Places for earthquakes:

Common Places for earthquakes Most of the time earthquakes happen in the Ring of Fire. This Ring of Fire is the outline of the Pacific Ocean. If one earthquake happens it affects the whole Ring of Fire. This happens because of shock waves.

What causes earthquakes:

What causes earthquakes Earthquakes are caused by faulting, a sudden lateral or vertical movement of rock along a rupture surface . The plate tectonics, which is always moving, rub up against each other in some places(San Andreas Fault in California). At such places the motion isn’t smooth, the plates are stuck together at the edges but the rest of each plate is continuing to move, the rocks along the edges are distorted. As the motion continues, the strain builds up to the point where the rock cannot stand any more bending. The rock breaks and two sides move. An earthquake is the shaking that radiates out from the breaking rock.

Earthquake Effects:

Earthquake Effects Earthquakes produce various damaging effects to the areas they act upon. This includes damage to buildings, and some cases the loss of human life. The rumbling of earthquakes usually leads to destruction of structures such as buildings, bridges and dams. Earthquakes can also trigger landslides. Earthquakes that takes place in the ocean are also known to trigger tsunamis.

Types of earthquakes:

Types of earthquakes Tectonic Earthquakes- most common earthquake, they occur when rocks in the earth's crust break due to geological forces created by movement of tectonic plates. Volcanic Earthquakes- earthquakes that result from tectonic forces which occur in conjunction with volcanic activity.

PowerPoint Presentation:

3. Collapse Earthquakes- small earthquakes in underground caverns and mines that are caused by seismic waves produced from the explosion of rock on the surface. 4. Explosion Earthquakes- results from the explosion of nuclear and chemical devices.

Other interesting facts:

Other interesting facts It is estimated that there are several million earthquakes in the world each year. Earthquakes are one of the most powerful natural forces on earth and regularly affect people around the world . Earthquakes strike suddenly, violently, and without warning at any time of the year and at any time of the day or night .

Bibliography:

Bibliography http:// en.wikipedia.org/wiki/Earthquake http:// library.thinkquest.org/J001393/earthquakes/movie_play_b.htm http:// library.thinkquest.org/16132/html/quakeinfo/effects.html http:// scign.jpl.nasa.gov/learn/eq2.htm http://www.fema.gov/hazard/earthquake/facts.shtm http ://www.vtaide.com/png/George/earthquake.htm

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