On a ledge just inside the lip of Chile's Quizapu volcanic crater,Philipp Ruprecht was furiously digging a trench. Here at an elevation of 10000 feet, a 1000-foot plunge loomed just yards away, or wind was whipping dust off his shovel. But the volcanologist was excited. Ruprecht had just found this spot, topped with undisturbed wedding-cake layers of fine, black fabric that the crater had vomited from the deep soil some 84 years ago. Samples from the currently inactive site might shed light on its exceedingly violent behavior.
Source: phys.org