Experts are trying to figure out what's behind a string of weak earthquakes in rural western Alabama.

Records from the U.S. Geological Survey show 14 quakes have occurred since Nov. 20 in Alabama's Greene County, west of Tuscaloosa.

A state earthquake expert says researchers have installed a seismic monitor in the area, northwest of Eutaw, looking for a cause. The tremors could be tied to underground faults that were found in recent years, but experts don't suspect a link to oil or gas production.

No major damage has occurred, but residents are uneasy. Homeowner Jim Sterling says he didn't know what had hit his 156-year-old antebellum home when the first quake occurred in late November.

The most recent quake struck June 6. All have been a magnitude 3.8 or weaker.