A major earthquake struck southern Mexico at 7:27 local time on Friday 18 April 2014. The effects of the earthquake, which had its epicenter in Guerrero, were felt at least as far away as Mexico City. Authorities in the states affected, which include Guerrero, Morelos, México, Puebla, Oaxaca, Querétaro, Veracruz, Jalisco, Michoacán, Tlaxcala, Guanajuato, Hidalgo, Colima and the Federal District, have reported only minor damage, and no loss of life.
The preliminary report from Mexico’s National Seismological Institute says that the earthquake had a magnitude of 7.0, with an epicenter 31 kilometers northwest of Tecpan in Guerrero, and occurred at 7:27 a.m. local time. The earthquake occurred at a depth of 10 kilometers.
Initial reports from the U.S. Geological Survey (including a map) are that the earthquake was 7.5 magnitude, and at a depth of around 48 kilometers (30 miles). The USGS has since downgraded the magnitude to 7.2.
First hand reports from Mexico City say that power went off in several areas in the north of the city, and that cell phone communications were also down in some areas. The Federal Electricity Commission reported 6 hours after the earthquake that power had been restored to 98% of the 1.2 million people affected in the Mexico City Metropolitan Area. Some windows have been shattered, and there are a handful of reports of minor structural damage, including 15 walls that collapsed and 48 buildings that suffered some damage. The city was quieter than normal because of the Easter holidays, during which many city dwellers take vacations at the beach.
The most serious damage in Mexico City appears to have been in the Morelos residential complex in colonia Doctores, where the residents of two of the 14-story buildings have apparently been evacuated following reports of cracks in walls and passageways, and the separation of some stairways. Following a formal building inspection, one of the buildings will not be reoccupied prior to remedial work being carried out.
Residents of Mexico City received 65 seconds warning via Mexico’s advanced Seismic Alert system (Sistema de Alerta Sísmica), which functioned precisely as it was designed to. There were more than twenty aftershocks in the five hours after the initial earthquake, the largest of which was magnitude 4.8.
George Dunn in Puerto Vallarta (see comments) reports that buildings at the Bay View Grand were evacuated. “but all is well”. Many tourists in Puerto Vallarta and Acapulco left their hotel rooms temporarily during the quake which lasted about one minute.
In Guerrero, it is reported that the highway between Acapulco and Ixtapa-Zihuatanejo is temporarily closed to traffic while inspections are carried out of a bridge near Tecpan, where the road shows a marked displacement (see image), and the rubble from several small landslides is removed. [Update: 9 May 2014: A second earthquake of magnitude 6.4 on 8 May has caused the bridge to collapse completely. The bridge, known as “El Cuajilote” is located at km 111 of the federal highway between Acapulco and Zihuatanejo.]
Later on Friday, officials of Guerrero state acknowledged that many public buildings in the state suffered damage from the earthquake. In Petatlán, near the epicenter, at least 100 homes were damaged. In the state capital of Chilpancingo, several walls collapsed, at least three homes and the tower of the Santa María de la Asunción cathedral suffered some damage.
As a precaution, the main (tourist) dock in Zihuatanejo has been closed, pending a formal inspection, but is expected to be back in operation within the next day or two.
Curious coincidence: The earthquake came exactly 108 years to the day after the Great San Francisco Earthquake of 1906.
We will continue to update this post periodically over the next few days to reflect any significant changes.