Just a thought. A strong swarm of earthquakes occurred in Hawaii the day of
Loma Prieta (19 October, 1989). This was probably due to the X20 solar flare on
19 October, however, and was likely not completely caused by far-field triggering.
Following is a listing of the most active days seismically in Hawaii in the past 20 years:

# events/Dates
268 6/23/1982
207 6/24/1982
233 3/3/1992
233 1/2/1983
193 11/17/1983
189 11/16/1983
168 9/25/1982
124 9/26/1982
147 12/9/1982
143 1/1/1975
138 8/10/1981
133 8/12/1981
129 1/7/1983
124 10/19/1989
122 3/26/1991
115 11/18/1983
103 1/5/1983
99 8/11/1981
99 11/29/1975
96 1/20/1981
92 7/22/1996
87 6/25/1989
86 12/19/1991
85 1/21/1982
83 6/22/1982
80 11/19/1983
80 10/11/1989
80 1/2/1975
79 6/26/1989
75 1/3/1983
74 7/23/1996

Also affecting the timing of this swarm may be a tropical depression currently
directly south of Lo'ihi Seamount - for tracking infomation on this weather system
see:
http://www.wunderground.com/auto/HurricaneSite/tropical/tracking/cp200101.html

• Trackline of tropical depressions south of Lo'ihi today