Residents with any information have been urged to contact the concerned authority
- China Xinhua News (@XHNews) September 9, 2017
Mexico City escaped major damage, but the quake terrified sleeping residents, many of whom still remember the catastrophic 1985 earthquake that killed thousands and devastated large parts of the city.
Families were jerked awake by the grating howl of the capital's seismic alarm. Some shouted as they dashed out of rocking apartment buildings. Even the iconic Angel of Independence Monument swayed as the quake's waves rolled through the city's soft soil.
Part of a bridge on a highway being built to the site of Mexico City's planned new international airport collapsed due to the earthquake, local media reported.
Elsewhere, the extent of destruction was still emerging. Hundreds of buildings collapsed or were damaged, power was cut at least briefly to more than 1.8 million people and authorities closed schools Friday in at least 11 states to check them for safety.
The Interior Department reported that 428 homes were destroyed and 1,700 were damaged in various cities and towns in Chiapas.
The earthquake's impact was blunted somewhat by the fact that it was centered 100 miles offshore. It hit off Chiapas' Pacific coast, near the Guatemalan border, with a magnitude of 8.1 - equal to Mexico's strongest quake of the past century. It was slightly stronger than the 1985 quake, the U.S. Geological Survey said.
The epicenter was in a seismic hotspot in the Pacific where one tectonic plate dives under another. These subduction zones are responsible for producing some of the biggest quakes in history, including the 2011 Fukushima disaster and the 2004 Sumatra quake that spawned a deadly tsunami.
Three people were killed in San Cristobal, including two women who died when a house and a wall collapsed, Chiapas Gov. Manuel Velasco said.
"There is damage to hospitals that have lost energy," he said. "Homes, schools and hospitals have been damaged."
In Tabasco, one child died when a wall collapsed, and an infant died in a children's hospital when the facility lost electricity, cutting off the ventilator, Gov. Arturo Nunez said.
The quake triggered tsunami warnings and some tall waves, but there was no major damage from the sea. Authorities briefly evacuated a few residents of coastal Tonala and Puerto Madero because of the warning.
The Pacific Tsunami Warning Center reported waves of 3.3 feet (1 meter) above the tide level off Salina Cruz, Mexico. Smaller tsunami waves were observed on the coast or measured by ocean gauges elsewhere.
In neighboring Guatemala, President Jimmy Morales appeared on national television to call for calm while emergency crews surveyed damage. Officials later said only four people had been injured and several dozen homes damaged.
The quake occurred near the point of collision between three tectonic plates, the Cocos, the Caribbean and the North American.
The area has seen at least six other quakes of magnitude 7.0 or greater since 1900. Three of those occurred within a nerve-wracking nine-month span in 1902-1903, according to Mexico's National Seismological Service.
- Jon Williams (@WilliamsJon) September 9, 2017
"It's unusual, but it's not unheard of," said seismologist Susan Hough of the USGS, describing how stresses on the seafloor can produce big earthquakes.
The new quake matched the force of a magnitude 8.1 quake that hit the country June 3, 1932, roughly 300 miles (500 kilometers) west of Mexico City.
Residents with any information have been urged to contact the concerned authority
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