Macquarie Islands precursory elements... notice this is ONLY Macquarie, not even taking into account Greenland or Nunavut.
1938-10-09 6.3 Macquarie Island region
1938-10-10 7.3 Molucca Sea
1970-06-11 7.3 Macquarie Island region
1970-06-14 7.0 Chile
1970-06-15 7.2 Argentina
1970-06-24 7.4 Haida Gwaii Region, Canada <- this is important because it's close to the Vancouver Islands swarm
1987-02-07 5.6 Macquarie Island region
1987-02-08 7.4 PNG
1988-02-23 5.9 Macquarie Island region
1988-02-24 7.3 Catanduanes, Philippines
1988-11-05 5.2 Balleny Islands region <- different region name, but still very close.
1988-11-06 7.7 Myanmar-China border region
1990-09-30 7.5 Oaxaca, Mexico
1990-10-02 5.4 Macquarie Island region
2003-03-13 5.9 Balleny Islands region
2003-03-17 7.1 Rat Islands, Aleutian Islands
2004-09-01 5.8 Macquarie Island region
2004-09-05 7.2 & 7.4 Western Honshu, Japan
2007-06-12 5.3 Macquarie Island region
2007-06-13 6.7 Offshore Guatemala
2007-07-29 5.2 Balleny Islands region
2007-08-01 7.2 Vanuatu