A magnitude 4.6 aftershock hit at 10: 15 am (central time) . 
A magnitude 4.6 aftershock hit at 10: 14 am (central time) on April 18. A magnitude 4.0 aftershock hit at 12:38 am (central time) on April 21.
R
15
14
R
.
on April 18.
A
A magnitude 4.0 aftershock hit at 12:38 am (central time) on April 21.