Earthquakes by Yasmin Robles

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Slide Notes

Earthquakes

Published on Apr 04, 2016

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PRESENTATION OUTLINE

2-6 EARTHQUAKES

By Jerry, Yasmin, Emileigh, Zoe, Megan, and Sianna

WHAT ARE EARTHQUAKES?

Photo by martinluff

Earthquakes are a movement of trembling of the ground that is caused by a sudden release of energy when rocks along a fault move.

Earthquake waves can be tracked to a point below Earths surface known as the focus. The focus is the location within Earth along a fault at which the first motion of an earthquake occurs.

WHAT CAUSES EARTHQUAKES?

Photo by CECAR - Climate and Ecosystems Change Adaptation R

Earthquakes occur mostly near boundaries of tectonic plates. Tectonic plate boundaries are the edge between two or more plates classified as divergent, convergent, or transform by the movement taking place between the plates.

Photo by Brigadier Chastity Crispbread

THE TYPES OF BOUNDARIES

Photo by shelby-dog

At a divergent boundary,plates pull apart, causing the crust to stretch.
Stress that stretches rock and makes rock thinner is called tension.

Convergent plate boundaries occur when plates collide, causing rock to be squeezed. Stress that shortens or squeezes an object is known as compression. Earthquakes that happen at convergent boundaries can very strong.

A transform boundary is a place where z tectonic plates slide pas teach other horizontally. Stress that distorts a body by pushing different parts of the body in opposite directions called shear stress.

EFFECTS OF EARTHQUAKES

Photo by Tex Texin

Many earthquakes do not cause major damage. Some earthquakes cause billions of dollars of destruction, human injuries, and loss of life. Tsunamis and danger to people and structures happen.

Photo by DFID - UK Department for International Development

Yasmin Robles