Updated 12:03 p.m. ET
MEXICO CITY Earthquakes shook a broad swath of southern Mexico on Tuesday, causing buildings to sway in the capital and sending thousands fleeing into the streets as quake alarms sounded. But there were no immediate reports of damages or injuries.
The U.S. Geological Survey said a magnitude-5.5 quake hit at 7:04 a.m. (9:04 a.m. EDT; 1304 GMT), centered about 10 miles west-southwest of Pinotepa Nacional on the Pacific Coast and 227 miles south-southeast of Mexico City.
Mexico Seismology Service initially calculated the quake's magnitude at 5.9.
A second quake struck near the same spot eight minutes later, also setting off alarms in the capital and causing people to evacuate tall buildings in the capital. The USGS calculated the magnitude of that quake at 5.1.
Mexico City's soft soil and geology make it especially sensitive to distant earthquakes. But Mayor Manuel Mancera said in a Twitter post that no damage was reported. Local news media also said there were no reports of damage close to Pinotepa Nacional.
Last night, a larger 6.2-magnitude earthquake shook neighbor Guatemala, the U.S. Geological Survey reports.
That earthquake struck late near Guatemala City, but residents said they barely felt the temblor and authorities had no immediate reports of damages or deaths.
The USGS said the quake's epicenter was located 4 miles northwest of San Jose Pinula and had a depth of 124 miles.
"So far we have received no reports of damage and we're monitoring nationwide," said Mario Cruz, a spokesman for firefighters.
The quake was only 6 miles from Guatemala's capital, but was barely felt, perhaps because of its depth.
In November 2012, a magnitude-7.4 earthquake left 42 people dead in Guatemala. The quake, which was just 20 miles deep, was centered off the coastal town of Champerico. It was the strongest earthquake to hit Guatemala since a 1976 temblor that killed 23,000.