Thermokarst (image) University of Alaska Fairbanks Caption This is an aerial view of a thermokarst near the Toolik Field Station, 150 miles north of the Arctic Circle. Thawing of ice rich permafrost resulted in the collapse of the ground surface. Credit Photograph by Tamara K. Harms, July 2009 Usage Restrictions University of Alaska Fairbanks Marketing and Communications makes high-resolution photographs and video available to the news media for non-commercial uses only. All uses are for one-time, exclusive use in one publication or production only. Due credit will be given to the photographer whose name is provided by UAF Marketing and Communications. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.