Wikimedia Commons

ScienceShot: Dead Sea Rising

Sid is a freelance science journalist.

The lowest spot on Earth is gaining a teeny bit of altitude. Water level in the Dead Sea, whose shores lie about 423 meters below sea level, has been dropping for decades—not due to climate change, but because humans increasingly draw large amounts of water from the rivers that feed into the super-saline lake. Data from buoys suggest that between 1993 and 2001, water level in the lake dropped an average of 88 centimeters each year. But satellite data gathered during the same period, reported this month in the Journal of Geophysical Research-Solid Earth, indicate that the terrain within a few dozen kilometers of the Dead Sea rose as much as 4.3 millimeters per year, with the largest increases taking place along the lake's shore. The slight rise in landscape stems directly from the decline in lake level, the scientists explain. Less water in the 67-kilometer-long lake means less weight pressing down on the surrounding terrain, so Earth's crust has rebounded upward—a faster, smaller-scale version of what happened when massive ice sheets melted at the end of the last ice age.

See more ScienceShots.

Posted in Earth