There was a M6 offshore Ecuador that is about 2 deg from being at the antipode of the M6.8 Nias quake. This means nothing by itself...we were talking about this I think after the M9.2 or 8.7 when there was a bit of a swarm offshore Ecuador....but the Ecuador quakes did not occur when expected (or something). So, means nothing now but I'll keep an eye on these 2 areas anyway. I think antipodes may be the one FFA that are real...but perhaps weak.....the 1927 Lompoc California quake was 4 days after M7 in middle of Indian Ocean very close to antipode. But, I suspect that systematic graphing would not show anything much....probably was included in the graphs on this subject that Roger did.
Chris