Taxonomy term

sara e. pratt

Listening for gas bubbles

Passive acoustic technology detects natural gas leaks and seeps

In recent decades, active acoustic surveys have been used to detect methane seeps and gas hydrates — deposits of crystalline solids consisting of gas molecules, usually methane, surrounded by a cage of water molecules — buried under the seafloor.

27 Feb 2012

AAG: Eruption of El Salvador's Ilopango explains A.D. 536 cooling

El Salvador’s Lake Ilopango, near the capital city of San Salvador, is known for boating, diving and the rugged, scenic beauty of its 100 meter-tall cliffs --- the lip of the caldera that holds the lake. However, 1,500 years ago, it may have been the site of one of the most horrific natural disasters in the world. It may also be the long-sought cause of the extreme climate cooling and crop failures of A.D. 535-536, reported Robert A.

25 Feb 2012

Unearthing Antarctica's mysterious mountains

In 1958, geologists discovered a mountain range buried more than a kilometer beneath the East Antarctica Ice Sheet. For more than half a century, the origins of the Gamburtsev Subglacial Mountains have proven to be a geological puzzle, but a new study may have finally solved the enigma, and simultaneously given geologists a new understanding of mountain-building processes.

07 Feb 2012

Dangerous dust: Erionite - an asbestos-like mineral causing a cancer epidemic in Turkey - is found in at least 13 states

As North Dakota’s state geologist, Ed Murphy has spent a fair amount of time mapping the geology of the Killdeer Mountains in the western part of the state, hiking up and down buttes of the White River Group and the Arikaree Formation. In the 1980s, he and colleagues mapped large deposits of rocks bearing erionite — a zeolite mineral formed when volcanic ash is altered by water — that may have had some commercial use.

31 Jan 2012