On Thursday, 17 March 2016 14:14:53 UTC, Weatherlawyer wrote:

looks like we are down one Chilean but the sequence was noticeably different.

2016/03/19

6.2 Mb Andreanof Islands, Aleutians
5.4 mb Bering Sea
4.8 M Andreanof Islands, Aleutians

2016/03/18

4.8 M Northwest of Ryukyu Islands
5.1 M Vancouver Island, Canada
4.3 Mb North of Severnaya Zemla
5.0 M Bonin Islands, Japan Region
5.5 M Santa Cruz Islands
4.7 Mb Andreanof Islands, Aleutians

So it appears these sequences move either north or south. I believe this goes some way to explain the disparity of latitudes in the lists of earthquake locations. But not what is going on nor why. (Apart from the fact they are all regions that get hit when the relevant systems leave the N.E. coast of North America, that is.)