Printer Friendly

HOW AN EARTHQUAKE HAPPENS.

An earthquake usually occurs at a fault, a fracture in Earth's crust that separates two large, constantly moving slabs of rock. As the slabs push against each other, intense pressure builds. When the pressure becomes extreme, rocks on either side of the fault suddenly shift. The point where the slabs first shift is called the focus (1). Massive waves of energy released by the rupture travel upward from the focus, making land shake, toppling buildings (Gujarat, India, top), and loosening soil to cause landslides (Santa Tecla, El Salvador, bottom).The spot on Earth's surface directly above the focus is called the epicenter (2).
COPYRIGHT 2001 Scholastic, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2001, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

 Reader Opinion

Title:

Comment:



 

Article Details
Printer friendly Cite/link Email Feedback
Publication:Science World
Article Type:Brief Article
Date:Mar 12, 2001
Words:103
Previous Article:Shake Up.
Next Article:SEEING-EYE PONY.
Topics:


Related Articles
Reservoir linked to deadly quake in India.
Shakin' on the fault line.
Model offers grounds for midwestern quakes.
Earthquake Disaster.
Cargo moves on time despite quake.
IRAN - Dec. 26 - Earthquake Hits Bam; Over 30,000 Killed.
The Center for Community Earthquake Preparedness focuses on Earthquake Preparedness issues in Mississippi's Medical Community.
Some temblors probably were triggered by tides.
A great quake coming?

Terms of use | Copyright © 2014 Farlex, Inc. | Feedback | For webmasters