The 1985 Mexico City earthquake prompted a national rethink of earthquake and emergency preparedness measures . The government of Mexico City sponsored the placement of accelerometers throughout the city in 1987 , allowing data to be obtained on ground movements in the area . With the support of the local government , CIRES developed Mexico City 's earthquake alert system , which began operating with 12 sensors in 1991 and has been publicly available since 1993
1985 Mexico City earthquake
1985 Mexico City earthquake
Mexican Seismic Alert System