How far South American cities moved in Chile quake

Washington, March 9 (ANI): In a new research, scientists have shown how far South American cities moved in the massive earthquake that struck Chile on February 27.

Preliminary measurements, produced from data gathered by researchers from four universities and several agencies, including geophysicists on the ground in Chile, paint a much clearer picture of the power behind this temblor, believed to be the fifth-most-powerful since instruments have been available to measure seismic shifts.

The quake's epicenter was in a region of South America that's part of the so-called "ring of fire," an area of major seismic stresses which encircles the Pacific Ocean.

All along this line, the tectonic plates on which the continents move press against each other at fault zones.

The February Chilean quake occurred where the Nazca tectonic plate was squeezed under, or "subducted," below the adjacent South American plate.

Quakes routinely relieve pent-up geologic pressures in these convergence zones.

The research team deduced the cities' movement by comparing precise GPS (global positioning satellite) locations known prior to the major quake to those almost 10 days later.

Measurements indicate that the massive magnitude 8.8 quake moved the entire city of Concepcion at least 10 feet to the west, and shifted other parts of South America as far apart as the Falkland Islands and Fortaleza, Brazil.

Buenos Aires, the capital of Argentina and across the continent from the quake's epicenter, moved about 1 inch to the west; and Chile's capital, Santiago, moved about 11 inches to the west-southwest.

The cities of Valparaiso and Mendoza, Argentina, northeast of Concepcion, also moved significantly.

According to Ben Brooks, an associate researcher with the School of Ocean and Earth Science and Technology at the University of Hawaii and co-principal investigator on the project, the event, tragic as it was, offers a unique opportunity to better understand the seismic processes that control earthquakes.

"The Maule earthquake will arguably become one of the, if not the most important great earthquake yet studied. We now have modern, precise instruments to evaluate this event, and because the site abuts a continent, we will be able to obtain dense spatial sampling of the changes it caused," he said.

"As such, the event represents an unprecedented opportunity for the earth science community if certain observations are made with quickly and comprehensively," Brooks said. (ANI)