![]() Mexico City is built on a dry lakebed with soft soil made up of sand and clay, which amplifies the destruction that major earthquakes cause. All together, these seismic forces cause an average of 40 earthquakes a day in Mexico. Activity along the edges of the Rivera and Caribbean plates also generate seismic events. The border between the Cocos Plate and North American Plate, along the Pacific Coast of Mexico, creates a subduction zone that generates large seismic events. Mexico is one of the world's most seismically active regions, sitting atop several intersecting tectonic plates. Mexico is located in the lower middle part of the picture, to the right of the Cocos plate. Visible in the image is most of the North American continent, along with Central America. Twelve days earlier, the even larger 2017 Chiapas earthquake struck 650 km (400 mi) away, off the coast of the state of Chiapas. local time, just two hours before the 2017 earthquake. The 1985 quake was commemorated, and a national earthquake drill was held, at 11 a.m. The quake coincidentally occurred on the 32nd anniversary of the 1985 Mexico City earthquake, which killed around 10,000 people. 370 people were killed by the earthquake and related building collapses, including 228 in Mexico City, and more than 6,000 were injured. The earthquake caused damage in the Mexican states of Puebla and Morelos and in the Greater Mexico City area, including the collapse of more than 40 buildings. Its epicenter was about 55 km (34 mi) south of the city of Puebla, Mexico. ![]() The 2017 Puebla earthquake struck at 13:14 CDT (18:14 UTC) on 19 September 2017 with an estimated magnitude of M w7.1 and strong shaking for about 20 seconds. ![]()
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