[fogj094j0923j4]

Megaquake is following a major earthquake is well documented. This is not silly prophercy stuff. Parent was talking about that case.

[bluGill]

True, but when it not known. Worse, this may be the "megaquake". There are earthquakes all the time. There often isn't a megaquake following a big one. They do often enough to be documented, but not every time.