If these quakes are the result of gas exploration, there is a lot of work being done down there, because it takes a lot of energy to produce an earthquake that measures 2 or 3 on the Richter Scale. On the other hand, if the faults in that area are getting restless, a big quake could be on the way. http://news.yahoo.com/s/ap/20110217/ap_on_re_us/us_arkansas_earthquakes
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The USGS has posted a press
The USGS has posted a press release regarding this situation at http://www.usgs.gov/newsroom/article.asp?ID=2706