State earthquake experts will place more monitors around Greers Ferry Lake after a recent jump in the number of temblors.
While many of the 60 quakes in the past year were too light to be felt by people, the Arkansas Geological Survey hopes to pinpoint a cause.
Geologist Scott Ausbrooks says a closer look is warranted. He told Little Rock television station KATV that more monitors will be placed in an area from Clinton to Heber Springs.
Ausbrooks said the quakes could just be a natural occurrence, perhaps tied to recent water level changes at the lake. The region also has a pair of injection wells serving the natural gas industry.
Ausbrooks said it is too early to say whether those are contributing to the uptick.