Strongest Earthquake in a Century Strikes Mexico

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The Mexico earthquake occurred where one of the slabs of Earth's crust is slowly diving beneath another near the Middle American Trench in the Pacific Ocean.
The Mexico earthquake occurred where one of the slabs of Earth's crust is slowly diving beneath another near the Middle American Trench in the Pacific Ocean. (Image credit: USGS)

This story was updated Sept. 8 at 12:56 p.m. EDT.

The strongest earthquake to hit Mexico in 100 years struck off the country's southern coast late Thursday night local time, officials report. So far, 32 people are reported dead from the magnitude-8.1 temblor, which was felt by 50 million people across Mexico, according to news reports.

New York Times reporters in Mexico City described the terrifying scene: "The force sent residents of the megacity fleeing into the streets at midnight, shaken by the alarms blaring over loudspeakers and a full minute of tremors. Windows broke, walls collapsed, and the city seemed to convulse in terrifying waves."

The earthquake occurred as a result of a process called subduction. In this case, a slab of Earth's crust called the Cocos plate is slowing diving beneath the North American plate; This movement is happening in the Pacific Ocean near the so-called Middle American Trench, which is beneath Central America, just over 62 miles (100 km) southwest of Friday's earthquake, according to the U.S. Geological Survey (USGS).

The earthquake led to a tsunami watch, but the Pacific Tsunami Warning Center at the U.S. National Weather Service has reported waves of just about 3 feet (1 meter) off of Mexico's coast, The Washington Post reported.

This region has experienced eight other magnitude-7 or greater earthquakes over the last century, with most of these occurring near the Mexico-Guatemala border. The largest of those quakes was a magnitude-7.4 that occurred offshore of Guatemala in November 2012, causing 48 deaths and 150 injuries, the USGS said.

Editor's Note: This story was updated to update the number of fatalities and include information on the tsunami risk.

Originally published on Live Science. 

Jeanna Bryner
Managing editor, Scientific American

Jeanna Bryner is managing editor of Scientific American. Previously she was editor in chief of Live Science and, prior to that, an editor at Scholastic's Science World magazine. Bryner has an English degree from Salisbury University, a master's degree in biogeochemistry and environmental sciences from the University of Maryland and a graduate science journalism degree from New York University. She has worked as a biologist in Florida, where she monitored wetlands and did field surveys for endangered species, including the gorgeous Florida Scrub Jay. She also received an ocean sciences journalism fellowship from the Woods Hole Oceanographic Institution. She is a firm believer that science is for everyone and that just about everything can be viewed through the lens of science.