Avalanche

related topics
{island, water, area}
{math, energy, light}
{@card@, make, design}
{disease, patient, cell}
{car, race, vehicle}
{water, park, boat}
{rate, high, increase}
{ship, engine, design}
{system, computer, user}
{acid, form, water}
{build, building, house}
{service, military, aircraft}
{law, state, case}
{style, bgcolor, rowspan}
{village, small, smallsup}

An avalanche is a sudden rapid flow of snow down a slope, occurring when either natural triggers or human activity causes a critical escalating transition from the slow equilibrium evolution of the snow pack. Typically occurring in mountainous terrain, an avalanche can mix air and water with the descending snow. Powerful avalanches have the capability to entrain ice, rocks, trees, and other material on the slope. Avalanches are primarily composed of flowing snow, and are distinct from mudslides, rock slides, and serac collapses on an icefall. In contrast to other natural events which can cause disasters, avalanches are not rare or random events and are endemic to any mountain range that accumulates a standing snow pack. In mountainous terrain avalanches are among the most serious objective hazards to life and property, with their destructive capability resulting from their potential to carry an enormous mass of snow rapidly over large distances.

Avalanches are classified by their morphological characteristics, and are rated by either their destructive potential, or the mass of the downward flowing snow. Some of the morphological characteristics used to classify avalanches include the type of snow involved, the nature of the failure, the sliding surface, the propagation mechanism of the failure, the trigger of the avalanche, the slope angle, direction, and elevation. Avalanche size, mass, and destructive potential are rated on a logarithmic scale, typically of 5 categories, with the precise definition of the categories depending on the observation system or forecast region.

Contents

Full article ▸

related documents
Tsunami
Mount St. Helens
Zambezi
Geography of China
Dead Sea
Geography of Brazil
Geology of the Alps
Geography of Bolivia
Geography of Canada
Geography of Sri Lanka
Surtsey
Lava
Himalayas
Surface weather analysis
St Kilda, Scotland
Climate
Geography of Chad
Geography of Bermuda
Sea level rise
Lake-effect snow
Baltic Sea
Krakatoa
Sylt
Columbia River
Dune
Volcano
Mount Vesuvius
Thar Desert
Geography of Latvia
Earthquake