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Thar red curve continued up gently until about 16:00 UTC, then dipped slightly. No 6M quakes shown on NEIC, but at 18:00 there was another 5M quake, and the curve continued down.

There continues to be an approximately diurnal wave pattern to both red and blue curves.

At this point I would expect a 6M quake in the next four hours, based on location of the red curve, the continuance of the long wave pattern, and the discontinuance of the multiple 5M quake pattern. My guess for location is the South Pacific, in the New Britain, Loyalty, Fiji Island area, based on "common things occur commonly".

No guarantees, but I am trying to be scientific.

Donald