What's with the Recent Four Earthquakes Near Cardston, Alberta?

Something strange and rare has been happening near the community of Cardston, Alberta in the last few days.. and that is Earthquakes!

According to the USGS (United States Geological Survey), four Earthquakes have been rattling an area about 30km south-east of Cardston, these earthquakes been ranging from 2.4 - 2.7 in magnitude.
The earthquake timelines and USGS links are below:

UPDATE:  A couple of the manitudes of the earthquakes have been upgraded

Earthquake #1:  (2.4 magnitude) - Oct. 27 @ 2:01pm
http://earthquake.usgs.gov/earthquakes/eventpage/mb12847201#summary
Earthquake #2:  (2.7 updated to 2.8 magnitude)Oct. 30 @ 9:08pm
http://earthquake.usgs.gov/earthquakes/eventpage/mb12197392#summary
Earthquake #3:  (2.6 updated to 2.7 magniude) Oct. 30 @ 11:58pm
http://earthquake.usgs.gov/earthquakes/eventpage/mb12592005#summary
Earthquake #4: (2.4 magnitude)  Nov. 1 @ 12:56am
http://earthquake.usgs.gov/earthquakes/eventpage/mb12183514#summary

What do you think may be starting these little tremblors... perhaps a hidden fault and a glimpse to something bigger or is it a result of oil fracking.  I guess we'll just have to wait and see!