A crevasse is a deep crack that forms in a glacier or ice sheet. Crevasses form as a result of the movement and resulting stress associated with the shear stress generated when two semi-rigid pieces above a plastic substrate have different rates of movement. The resulting intensity of the shear stress causes a breakage along the faces.

2023年10月19日 · Encyclopedic entry. A crevasse is a deep, wedge-shaped opening in a moving mass of ice called a glacier. Crevasses usually form in the top 50 meters (160 feet) of a glacier, where the ice is brittle.

crevasse, fissure or crack in a glacier resulting from stress produced by movement. Crevasses range up to 20 m (65 feet) wide, 45 m (148 feet) deep, and several hundred metres long. Most are named according to their positions with respect to the long axis of the glacier.

5 天之前 · Learn about types of crevasses and how they form. A crevasse is a crack in the surface of a glacier caused by extensive stress within the ice. For example, extensive stress can be caused by stretching if the glacier is speeding up as it flows down the valley. Crevasses can also be caused by the ice flowing over bumps or steps in the bedrock.

2018年5月8日 · A deep fissure in the surface of a glacier, caused when tensile stress overcomes the shear strength of ice in the brittle upper few metres. Appropriate tensile stresses are typically developed when a glacier moves over a convex slope. 2. A breach in a levee along the bank of a river, through which flood water may flow and produce crevasse splays.

2018年2月9日 · Crevasses are cracks that form in glacier ice when the glacier is put under too much stress for it to deform by flowing. This can happen when: (1) The ice stretches too fast and is pulled apart, for example if the ice speeds up as it flows down the valley;

2017年11月16日 · Crevasses are fractures in a glacier caused by the stresses of movement. They are like the cracks in the surface of clay as one pulls it apart past the limits of elasticity. They most often occur where the flow of a glacier increases, like in a steep deepening valley, and are thus oriented perpendicular to direction of flow.

2016年1月12日 · Crevasses are common to virtually all glaciers, ice sheets, and ice shelves (Figure 1). Crevasses are visible manifestations of the stresses within glacier ice. They are part of the broader continuum of fracture processes in terrestrial ice, which spans a diverse range from crystal-sized fracture in ground ice to kilometer-sized leads in sea ice.

2017年3月17日 · A crevasse is a crack, crevice, or fracture in a glacier or moving mass of ice that forms from the movement and stress of the glacier, especially as it moves downhill. Stress in the ice caused by the glacier’s movement causes crevasses to open and close.

2021年8月27日 · A crevasse is a near-vertical, V-shaped fissure in ice common to all glaciers and ice sheets. It can range from a few millimeters to many meters in thickness and is a brittle structure arising as a result of the glacier ice undergoing extension.