By MARK LORENZANA

Another powerful earthquake shook Mexico in the early-morning hours of Thursday, Sept. 22, with a preliminary magnitude of 6.9, according to the National Seismological Service (SSN).

The quake, which hit at 1:16 a.m. in the morning and sent nervous residents across the capital and central Mexico rushing into the street, was, in fact, an aftershock of the 7.7 magnitude tremor that rocked the nation on Monday, Sept. 19.

The SSN identified Coalcoman, Michoacán, as the epicenter of the quake, although its effects were also felt in Mexico City, where seismic alarms were heard moments before.

In Mexico City, two people died during the quake, a woman who fell during the evacuation and hit her head in Colonia Doctores and a man who had a heart attack in Coyoacán.

Mexico City Governor Claudia Sheinbaum reported that helicopters had been deployed to fly over the city for monitoring purposes, but no serious damage to structures had been recorded at 7 a.m. on Thursday.

According to Mexico’s National Civil Protection Coordination, the earthquake was also felt in the Mexican states of Puebla, Morelos, Guerrero and Colima, where emergency protocols were activated to identify possible damage.

Just days before, on the afternoon of Monday, Sept. 19, a 7.7 magnitude earthquake hit Mexico, killing two people.