The last major earthquake in the region occurred on 20 March 2012 , and was 7.4 on the Richter scale . It was centered near Ometepec and was the strongest since the 1985 quake . It was preceded by at least 16 quakes of over 5.0 in the same spring . Municipalities in the region that suffered damage include Ometepec , Xochistlahuaca , Copala , Cruz Grande and Marquelia . Most of the serious damage from this quake occurred in the Costa Chica region , with over 900 homes made inhabitable
last major earthquake in the region
2012 Guerrero–Oaxaca earthquake
Costa Chica of Guerrero