Hi Roger. Just out of curiosity I looked for other quakes larger then M=7.0 and found only one within a 160Km (100 miles) radius. When I expanded the search to 320Km (200 miles) I found 3 more quakes.

Two M=7.0+ quakes in less then 24 hours have occurred 155 times since 1900. Rare, but not all that rare. Quakes occur all the time and sooner or later there will be some that will occur in close proximity to one another in regards to time. Interesting though. Take Care…Don in creepy town

catalog=ANSS
start_time=1898/01/01,00:00:00
end_time=2006/01/03,23:14:12
minimum_magnitude=7.0
maximum_magnitude=10
event_type=E
delta=0 km to 160 km from (-60.809,-21.451)
Date Time Lat Lon Depth Mag Magt Nst Gap Clo RMS SRC Event ID
----------------------------------------------------------------------------------------------
1973/10/06 15:07:37.30 -60.8230 -21.5490 33.00 7.00 Ms 49 0.00 NEI 197310064011
2006/01/02 06:10:49.55 -60.8090 -21.4510 10.00 7.30 Mw 94 1.21 NEI 200601021003