Repeat electrical resistivity tomogram images of Barter Island bluffs

Repeat electrical resistivity tomogram (ERT) images collected on the coastal bluffs of Barter Island reveal the effects of one summer thaw cycle. Hotter colors indicate high resistivity values, which in this case likely represent low-conductivity permafrost. ERT profiles were collected along the same transects during the 2015 fieldwork to examine annual change and to identify sites for drilling into permafrost.