This earthquake was an interplate earthquake that occurred in the central part of the Michoacán seismic gap . The 1985 Michoacán earthquake broke the two remaining parts of the Michoacán gap , i.e. those to the north and south of the 1981 Playa Azul earthquake rupture zone . The 1981 Playa Azul earthquake had a focal mechanism of reverse faulting from a shallow-dipping thrust fault . The maximum slip of this earthquake was estimated to be about 4.04 m . According to the calculation of C. Mendoza , along the dipping interface the area of maximum slip was concentrated below the hypocenter , and there was another area of significant slip , of about , above the hypocenter
1985 Michoacán earthquake
1985 Mexico City earthquake
1981 Playa Azul earthquake