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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 rupture, in medicine: see hernia.  travel upward from the focus, making land shake, toppling buildings (Gujarat, India, top), and loosening loosening /loo·sen·ing/ (loo´sen-ing) freeing from restraint or strictness.

loosening of associations
 soil to cause landslides (Santa Tecla, El Salvador Santa Tecla is a municipality in the La Libertad department of El Salvador. The municipality has 192,132 people in its municipality.

The city of Santa Tecla, El Salvador has more than 300,000 inhabitants (SIBASI 2001).
, bottom).The spot on Earth's surface Noun 1. Earth's surface - the outermost level of the land or sea; "earthquakes originate far below the surface"; "three quarters of the Earth's surface is covered by water"
 directly above the focus is called the epicenter (2).
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Publication:Science World
Article Type:Brief Article
Date:Mar 12, 2001
Previous Article:Shake Up.

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