<Tr> <Th> Aftershocks </Th> <Td> 39 (as of 12: 30 23 September 2017 CDT) </Td> </Tr> <Tr> <Th> Casualties </Th> <Td> 370 dead, 6,011 injured </Td> </Tr> <P> The 2017 Central Mexico earthquake struck at 13: 14 CDT (18: 14 UTC) on 19 September 2017 with an estimated magnitude of M 7.1 and strong shaking for about 20 seconds . Its epicenter was about 55 km (34 mi) south of the city of Puebla . 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 . 370 people were killed by the earthquake and related building collapses, including 228 in Mexico City, and more than 6,000 were injured . </P> <P> The quake coincidentally occurred on the 32nd anniversary of the 1985 Mexico City earthquake, which killed around 10,000 people . The 1985 quake was commemorated, and a national earthquake drill was held, at 11 a.m. local time, just two hours before the 2017 earthquake . Twelve days earlier, the even larger 2017 Chiapas earthquake struck 650 km (400 mi) away, off the coast of the state of Chiapas . </P>

How long was the earthquake in mexico 2017