Judging from the reaction of the different seismographs, it is likely that they are recording the 6.3 quake on the mid atlantic ridge which occured about the same period. The carribean seismographs have a crisp pattern, while those in China are more washed out (in a manner of speaking). Folks can take the tinfoil off
http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/us2010wsa6.php#details
Thanks so very much!!