When Mark Barrett moved to Guy, Arkansas, he had no idea the tiny town of less than 300 was nearly as rocking as the Southern California community he'd left behind. Six years and hundreds of seismic events later, Barrett says he's feeling it more and more. Since September, seismologists have recorded 700 temblors in the area. The largest in the current swarm, a 4.3-magnitude quake, shook the town at 2:13 a.m. Friday. The tremors appear to be rumbling through town with greater frequency. The Arkansas Geological Survey has recorded 50 quakes in and around Guy since Sunday. That includes Friday...