The following statement was made in the daily earthquake summary
From March 12, 2002 that might have some bearing on the Taiwan/Ryukyu
Earthquake last night (Mj 6.9):

"There have been occasions in the past, most notably prior to the
great Alaska earthquake of March 28, 1964, when a series of aligned
earthquakes occurred prior to a great earthquake at an FFA distance
to that event. These events all lie approximately 60 degrees from
a location in Northern Chile at about 20N 68W (or it's antipode at
20N 112E), although there is enough give and take in the alignment
that a number of other focal points could be found (such as TAIWAN,
So. Sandwich Islands, etc.). Generally these alignments of quakes
in the eastern U.S. appear to presage great events by no more than
2 days, but there are also cases where no great event follows.
Coincidentally, several hours after these four events occurred
(three occurred within 4 hours of each other) the largest earthquake
of the day hit at 20S 68W with Ms 5.2 in Northern Chile."

More information at URL:

http://www.earthwaves.org/wwwboard/messages/13637.html

• Daily summary from March 12, 2002