Geologist says heavy lake caused earthquakes in Arkansas
An earthquake geologist links earthquakes in northern Arkansas to the weight of extra water at a flood-swollen reservoir. David Johnston of the Arkansas Geological Survey says the added weight of the water at Bulls Shoals Lake likely triggered 10 earthquakes over five days last week near Harrison.
Johnston says the reservoir's water level has risen 42 feet because of rainfall since March 1. He says the quakes are small, ranging from 1.5 to 3.6 in magnitude, and likely won't end soon.
Johnston has no reports of damage following a 3.6 magnitude quake on June 11 but says some people reported houses creaking and pictures rattling on walls.
The Arkansas Geological Survey will add more ground-detection devices to better record the earthquakes.