Ch 8 – Intro to Earthquakes Spring 2016. Earthquakes 8.1 What Is an Earthquake? Focus is the point within Earth where the earthquake starts. Epicenter.

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Presentation transcript:

Ch 8 – Intro to Earthquakes Spring 2016

Earthquakes 8.1 What Is an Earthquake? Focus is the point within Earth where the earthquake starts. Epicenter is the location on the surface directly above the focus.  An earthquake is the vibration of Earth produced by the rapid release of energy  Focus and Epicenter Faults are fractures in Earth where movement has occurred.  Faults

Focus, Epicenter, and Fault

Slippage Along a Fault

Cause of Earthquakes 8.1 What Is an Earthquake?  Elastic Rebound Hypothesis Most earthquakes are produced by the rapid release of elastic energy stored in rock that has been subjected to great forces. When the strength of the rock is exceeded, it suddenly breaks, causing the vibrations of an earthquake.

Elastic Rebound Hypothesis

Cause of Earthquakes 8.1 What Is an Earthquake? An aftershock is a small earthquake that follows the main earthquake. A foreshock is a small earthquake that often precedes a major earthquake.  Aftershocks and Foreshocks