The death toll from a major earthquake that struck southern Mexico earlier this week has risen to 90, authorities reported Sunday, after 25 new deaths were confirmed in Oaxaca state.

"The number of people who lost their lives amounts to 90, of whom 71 were in Oaxaca, 15 in Chiapas and four in Tabasco," the interior ministry said in a statement.

Mexican seismological authorities measured Thursday night's quake at magnitude 8.2, under the Pacific off the coast of Chiapas state.