earthquake riddle

off the coast of Ecuador

Jan 31, 1906

the magnitude was 8.8

Chile Argentia Border

Nov 11, 1922

the magnitude was 8.5

Kamchatka

Feb 3, 1923

the magnitude was 8.5

Band sea Indonesia

Feb 1, 1938

the manitude was 8.5

Assam-Tibet

Aug 15, 1950

the magnitude was 8.6

Kamchatka

Nov 4, 1952

The magnitude was 9.0

Andreanof Island, Alaska

Mar 9, 1957

the magnitude was 8.6

Chile

May 22, 1960

the magnitude was 9.5

Kuril Island

Oct 13, 1963

The magnitude was 8.5

1964 Great Alaska Earthquake

Mar 28, 1964

the magnitude wa 9.2