posted on Jan, 14 2007 @ 01:36 AM
Where does it say 50? And USGS says there have been 29 there. I have no idea how many aftershocks is considered normal.
There is no formula for how many aftershocks are normal for a particular size...each quake is different, each has it's own features, and each moves
it's own way.
That being said, it is not uncommon to have thousands of aftershocks in short order of a quake especially of this magnitude. I recall from the 94
quake here in LA that we reached over 1000 aftershocks within several days; some of them were nearly as large as the original shake. And there were
devastating aftershocks as long after that quake as 6 months.
If you think about it, if there were no aftershocks I'd be rather concerned...a massive amount of earth just shifted; it will continue to resettle
for quite some time...and if it doesn't, then there is additional pressure which needs to be considered.
So yes, that many aftershocks (either 50, or 29) is really rather normal.