Per KHNL in Hawaii, an earthquake with a 5.1 magnitude shook the island of Hawaii, Hawaii, today at 12:44 p.m. local time.
Here were some tweets from the affected area in chronological order, beginning with the first to break the news of the quake to Twitter: 
  -    allentenn  (Hilo, Hawaii) big time earthquake!!!!!!   14 Apr 2009  from TweetDeck   
-    dcb97  (Hilo, Hawaii) Whoa just felt an earthquake in Hilo. Small kine but it rocked and rolled a bit.   14 Apr 2009  from web   
-    808blogger  (Puna, Hawaii) whoa.... we just had a good sized quake   14 Apr 2009  from web   
-    bknykanaka (Hilo, Hawaii) MY FIRST EARTHQUAKE!   14 Apr 2009  from web   
-    castleinhawaii (Pahao, Hawaii) HUGE earthquake in Pahao   14 Apr 2009  from web   

Hawaii experiences moderate earthquake