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Sturzstrom
A Sturzstrom (from the German '' Sturz'' (fall) and ''Strom'' (stream, flow)) or ''rock avalanche'' is a large landslide consisting of soil and rock (geology), rock which travels a great horizontal distance (as much as 20 or 30 times) compared to its initial vertical drop. Sturzstroms have similarities to the flow of glaciers, mudflows, and lava flows. They flow across land fairly easily, and their mobility increases when volume increases. They have been found on other bodies in the Solar System, including the Moon, Mars, Venus, Io (moon), Io, Callisto (moon), Callisto, Iapetus (moon), Iapetus, and Phobos (moon), Phobos. Movement Sturzstroms may be triggered, similarly to other types of landslides, by rain, heavy rains, earthquakes, or volcano, volcanic activity. They move rapidly, but do not necessarily require water to be present to move, and there is no definite explanation for their kinematic characteristics. One theory, the acoustic fluidization theory, hypothesizes that vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Köfels Landslide
Umhausen is a municipality in the Imst district of state of Tyrol in western Austria. It and is located 17 km southeast of Imst at the Ötztaler Ache in the Ötztal. It has 3078 inhabitants. Geography The municipality consists of six villages: *Umhausen *Tumpen *Köfels *Farst *Niederthai *Östen Umhausen is located at the intersection of the Stubai Alps and the Ötztal Alps. The lowest point is in Tumpen (920m), the highest peak of the municipality is the Strahlkogel, at . Its name comes from its great, white, light-reflecting, quartz layers, which allegedly cause the mountain to "radiate" (''strahlen''). It has the shape of a well-proportioned, steep and pointed pyramid. Ascending the Strahlkogel is difficult and it is thus only rarely visited, unlike the neighbouring 3,287-metre-high Breiter Grieskogel. Climate Economy Umhausen was once a centre for cultivation of flax. Today the main source of income is tourism. In the area of the community lies the tallest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umhausen
Umhausen is a municipality in the Imst district of state of Tyrol in western Austria. It and is located 17 km southeast of Imst at the Ötztaler Ache in the Ötztal. It has 3078 inhabitants. Geography The municipality consists of six villages: *Umhausen *Tumpen *Köfels *Farst *Niederthai *Östen Umhausen is located at the intersection of the Stubai Alps and the Ötztal Alps. The lowest point is in Tumpen (920m), the highest peak of the municipality is the Strahlkogel, at . Its name comes from its great, white, light-reflecting, quartz layers, which allegedly cause the mountain to "radiate" (''strahlen''). It has the shape of a well-proportioned, steep and pointed pyramid. Ascending the Strahlkogel is difficult and it is thus only rarely visited, unlike the neighbouring 3,287-metre-high Breiter Grieskogel. Climate Economy Umhausen was once a centre for cultivation of flax. Today the main source of income is tourism. In the area of the community lies the tallest wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landslide
Landslides, also known as landslips, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, deep-seated grade (slope), slope failures, mudflows, and debris flows. Landslides occur in a variety of environments, characterized by either steep or gentle slope gradients, from mountain ranges to coastal cliffs or even underwater, in which case they are called submarine landslides. Gravity is the primary driving force for a landslide to occur, but there are other factors affecting slope stability that produce specific conditions that make a slope prone to failure. In many cases, the landslide is triggered by a specific event (such as a heavy rainfall, an earthquake, a slope cut to build a road, and many others), although this is not always identifiable. Causes Landslides occur when the slope (or a portion of it) undergoes some processes that change its condition from stable to unstable. This is essentially due to a decrease in the She ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iapetus (moon)
Iapetus () is a moon of Saturn. It is the 24th of Saturn’s 83 known moons. With an estimated diameter of 1,469 km, it is the third-largest moon of Saturn and the eleventh-largest in the Solar System. Named after the Titan Iapetus, the moon was discovered in 1671 by Giovanni Domenico Cassini. A relatively low-density body made up mostly of ice, Iapetus is home to several distinctive and unusual features, such as a striking difference in coloration between its leading hemisphere, which is dark, and its trailing hemisphere, which is bright, as well as a massive equatorial ridge running three-quarters of the way around the moon. History Discovery Iapetus was discovered by Giovanni Domenico Cassini, an Italian-born French astronomer, in October 1671. He had discovered it on the western side of Saturn and tried viewing it on the eastern side some months later, but was unsuccessful. This was also the case the following year, when he was again able to observe it on the western ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
State Of Tyrol
Tyrol (; german: Tirol ; it, Tirolo) is a state (''Land'') in western Austria. It comprises the Austrian part of the historical Princely County of Tyrol. It is a constituent part of the present-day Euroregion Tyrol–South Tyrol–Trentino (together with South Tyrol and Trentino in Italy). The capital of Tyrol is Innsbruck. Geography The state of Tyrol is separated into two parts, divided by a strip. The larger territory is called North Tyrol (''Nordtirol'') and the smaller area is called East Tyrol (''Osttirol''). The neighbouring Austrian state of Salzburg stands to the east, while on the south Tyrol has a border with the Italian province of South Tyrol (Trentino-Alto Adige/Südtirol) which was part of the Austro-Hungarian Empire before the First World War. With a land area of , Tyrol is the third-largest state in Austria. Tyrol shares its borders with the federal state of Salzburg in the east and Vorarlberg in the west. In the north, it adjoins to the German state of Bav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ötztal
The Ötztal is an alpine valley located in Tyrol, Austria. The Ötztaler Ache river flows through the valley in a northern direction. The Ötztal separates the Stubai Alps in the east from the Ötztal Alps in the west. The valley is long. The northern end of the valley is at the confluence of the Ötztaler Ache and Inn rivers, 8 km east of Imst and 50 km west of Innsbruck. The only railway station of the valley, Ötztal railway station, is located here and connects the Ötztal with the Arlberg railway (Innsbruck-Bludenz) and also a motorway interchange to the A12 (E60). The southern end of the valley, also called the Gurglertal, terminates at the border with Italy. The valley is formed by the main chain of the Alps, with many glaciers and high peaks, including the Weißkugel and the Similaun. The village of Obergurgl at the southern end of the Ötztal is the highest parish in Austria. The Ötztal consists of five municipalities (from north to south): Sautens, Oetz, Umh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hill
A hill is a landform that extends above the surrounding terrain. It often has a distinct Summit (topography), summit. Terminology The distinction between a hill and a mountain is unclear and largely subjective, but a hill is universally considered to be not as tall, or as Grade (slope), steep as a mountain. Geographers historically regarded mountains as hills greater than above sea level, which formed the basis of the plot of the 1995 film ''The Englishman who Went up a Hill but Came down a Mountain''. In contrast, hillwalkers have tended to regard mountains as peaks above sea level. The ''Oxford English Dictionary'' also suggests a limit of and Whittow states "Some authorities regard eminences above as mountains, those below being referred to as hills." Today, a mountain is usually defined in the UK and Ireland as any summit at least high, while the official UK government's definition of a mountain is a summit of or higher. Some definitions include a topographical pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Momentum
In Newtonian mechanics, momentum (more specifically linear momentum or translational momentum) is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction. If is an object's mass and is its velocity (also a vector quantity), then the object's momentum is : \mathbf = m \mathbf. In the International System of Units (SI), the unit of measurement of momentum is the kilogram metre per second (kgâ‹…m/s), which is equivalent to the newton-second. Newton's second law of motion states that the rate of change of a body's momentum is equal to the net force acting on it. Momentum depends on the frame of reference, but in any inertial frame it is a ''conserved'' quantity, meaning that if a closed system is not affected by external forces, its total linear momentum does not change. Momentum is also conserved in special relativity (with a modified formula) and, in a modified form, in electrodynamics, quantum mechanics, quan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vacuum
A vacuum is a space devoid of matter. The word is derived from the Latin adjective ''vacuus'' for "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure. Physicists often discuss ideal test results that would occur in a ''perfect'' vacuum, which they sometimes simply call "vacuum" or free space, and use the term partial vacuum to refer to an actual imperfect vacuum as one might have in a laboratory or in space. In engineering and applied physics on the other hand, vacuum refers to any space in which the pressure is considerably lower than atmospheric pressure. The Latin term ''in vacuo'' is used to describe an object that is surrounded by a vacuum. The ''quality'' of a partial vacuum refers to how closely it approaches a perfect vacuum. Other things equal, lower gas pressure means higher-quality vacuum. For example, a typical vacuum cleaner produces enough suction to reduce air pressure by around 20%. But hig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Friction
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: *Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into ''static friction'' ("stiction") between non-moving surfaces, and ''kinetic friction'' between moving surfaces. With the exception of atomic or molecular friction, dry friction generally arises from the interaction of surface features, known as asperities (see Figure 1). *Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other. *Lubricated friction is a case of fluid friction where a lubricant fluid separates two solid surfaces. *Skin friction is a component of drag, the force resisting the motion of a fluid across the surface of a body. *Internal friction is the force resisting motion between the elements making up a so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acoustic Fluidization
Soil liquefaction occurs when a cohesionless saturated or partially saturated soil substantially loses strength and stiffness in response to an applied stress such as shaking during an earthquake or other sudden change in stress condition, in which material that is ordinarily a solid behaves like a liquid. In soil mechanics, the term "liquefied" was first used by Allen Hazen in reference to the 1918 failure of the Calaveras Dam in California. He described the mechanism of flow liquefaction of the embankment dam as: The phenomenon is most often observed in saturated, loose (low density or uncompacted), sandy soils. This is because a loose sand has a tendency to compress when a load is applied. Dense sands, by contrast, tend to expand in volume or 'dilate'. If the soil is saturated by water, a condition that often exists when the soil is below the water table or sea level, then water fills the gaps between soil grains ('pore spaces'). In response to soil compressing, the pore ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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