The earthquakes listed below recently occurred. And what appears unusual about them is the fact that instead of the two aftershocks having lower magnitudes than the original earthquake, their magnitudes actually got higher.

This is likely not something that has never happened before. But I expect that it is different than the usual trend for earthquakes and aftershocks.

Note that although their locations are fairly similar, their depths are different.

2011/11/18 07:51:27 37.55S 179.31E 27 6.0 New Zealand Area
2011/11/18 04:34:07 37.58S 179.29E 20 5.7 New Zealand Area
2011/11/18 02:43:54 37.76S 179.41E 18 5.2 New Zealand Area