EDIT: Sorry Greg, I see how many links I've included here. Please feel free to delete. However, they add to our understanding of 'earthquakes in divers places' (Mark 13:8). end edit.
Here is an interesting page about earthquakes in this region.
I'm amazed not to have heard more about them. They seem frequent, and there was a 6.4 as recently as February this year. It seems to be sparsely poplutated and hilly on the Myanmar side. Perhaps the minimal damage and no loss of life makes them appear less newsworthy.
http://earthquake-report.com/2011/02/02/very-dangerous-earthquake-on-the-china-myanmar-border-area/
http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc0002aes.php#summary
Another report from Myanmar states there was a 7 earthquake 140 miles below the surface about 90 minutes after the 6.8. They describe the larger earthquake as an 'aftershock', but there are many quite strong 'tremors' at this fault, according to the above article.
http://www.nowpublic.com/environment/myanmar-earthquake-2011-two-7-0-quakes-hits-burma-2770219.html
http://www.dailymotion.com/video/xhj6au_aftershocks-from-japan-earthquake-weakening-y-seismologist_news
http://au.news.yahoo.com/world/a/-/world/9077935/quake-kills-63-in-myanmar-aftershock-rattles-thailand/
(My pc won't open the pages with embedded video, so I haven't seen the full reports, or been able to estimate if they overlap.)