The 1989 Newcastle earthquake occurred in Newcastle, New South Wales on Thursday, 28 December. The shock measured 5.6 on the Richter magnitude scale and was one of Australia's most serious natural disasters, killing 13 people and injuring more than 160. The damage bill has been estimated at A$ 4 billion (including an insured loss of about $1 billion).
The 1989 Newcastle earthquake occurred 3 days after the new year.
The 1989 earthquake occurred on December 28, three days before the new year.  I think the system was fooled because it did not know how to calculate how many days were in between the new year and the date of the earthquake.
( z1 earthquake :location ( z2 city :name ( z3 name :op "Newcastle" ) ) :time ( z4 date-entity :year 1989 ) :time ( z5 after :op ( z6 festival :name ( z7 name :op "New" :op "Year" ) ) :quant ( z8 temporal-quantity :quant 3 :unit ( z9 day ) ) ) )