The Harvard CMT Project assigned it a focal depth of 647 km and a magnitude MW of 8.2 , making it , at the time , the largest earthquake since the 1977 Sumba earthquake , later superseded by more recent larger events ( e.g. , 2004 Indian Ocean earthquake ) . It is also the second largest earthquake ever recorded with a focal depth greater than 300 km , the largest currently being the 2013 Okhotsk Sea earthquake . South America also experienced the then second and third largest earthquakes at focal depths greater than 300 km : Colombia , 1970 ; and northern Peru , 1922
2013 Okhotsk Sea earthquake
2013 Okhotsk Sea earthquake
1994 Bolivia earthquake