Here is what it looked like on the seismometer I watch in Utah. Look at 1517 UT (right side). All the waves following the EQ are echos. The earth rang like a bell for an hour after the EQ.
A moderate earthquake occurred at 05:31:44 (UTC) on Friday, December 24, 2004. The magnitude 5.5 event has been located NORTH OF MACQUARIE ISLAND
Still shakin'...