Yes...in that it is on the same subduction zone. I think it most likely that, like the M8.7, the subduction zone would fail closer to the south end of the last rupture...which was probably a fraction of a degree north of the equator...but, once started, it could rupture a long way southeast. I though the activity at 1.6 deg S might mean something. The quake you are talking about that just occurred is 5 deg S. One question is whether this last quake is within the area of the 1833 (or is it 1831?) rupture, or if it is south of there. I am actually not following this closely...just casually (I watch the USGS-NEIC page and that is about it). I'm not even going to a seminar on the Sumatra quakes that is weekly 5 km away, and I have not read the papers involving Kerry Sieh, and have not spent much time on his Sumatra web site. I'd be interested in all of this, but I have to actually produce stuff for what I am funded for, and I have been working on proposals the last 3 weeks (I work southern California near the coast and offshore, on Ross Sea Antarctica, and will be working on the North Anatolia fault near Istanbul Turkey (and spent a fair amount of time on this in January to early March on logistics).
Chris