Quality of Life

Climate

Earthquake History

The Northeast Louisiana Economic Development Region is located in Seismic Zone 1, which means that an area is 10% channel active, peak acceleration level of 0.1g (1/10 the ascimation of gravity) will occur in the next 50 years. All states that have one or more historical incendences since quakes have been recorded even all of those outside the seismic zones identified in the earthquake region.

United States Government site shows earthquake and tectonic plates. It is educational and gives history as well as pictorial examples. “An earthquake is the shaking of the ground caused by an abrupt shift of rock along a fracture in the Earth, called a fault. Within seconds, an earthquake releases stress that has slowly accumulated within the rock, sometimes over hundreds of years.”

The size of an earthquake is indicated by a number called its magnitude. Magnitude is calculated from a measurement of either the amplitude or the duration of specific types of recorded seismic waves. Magnitude is determined from measurements made from seismograms and not on reports of shaking or interpretations of building damage. The intensity of an earthquake is a measure of the amount of ground shaking at a particular site, and it is determined from reports of human reaction to shaking, damage done to structures, and other effects.

Earth scientists believe that most earthquakes are caused by slow movements inside the Earth that push against the Earth’s brittle, relatively thin outer layer, causing the rocks to break suddenly. This outer layer is fragmented into a number of pieces, called plates. Most earthquakes occur at the boundaries of these plates. In Washington State, the small Juan de Fuca plate off the coast of Washington, Oregon, and northern California is slowly moving eastward beneath a much larger plate that includes both the North American continent and the land beneath part of the Atlantic Ocean. Plate motions in the Pacific Northwest result in shallow earthquakes widely distributed over Washington and deep earthquakes in the western parts of Washington and Oregon. The movement of the Juan de Fuca plate beneath the North America plate is in many respects similar to the movements of plates in South America, Mexico, Japan, and Alaska, where the world’s largest earthquakes occur.

More information

http://pubs.usgs.gov/gip/dynamic/understanding.html

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Northeast Louisiana Economic Alliance is a private membership, not-for-profit corporation utilizing local, state, federal and private resources and programs to enhance the available economic elements present in our region to promote and grow.

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