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Vibrations make large landslides flow like fluid

By Guest PostMay 29, 2016Environment, Scienceacoustic fluidization, geoscientists, large landslides, mesa county, vibrations

New research shows why some large landslides travel greater distances across flat land than scientists would generally expect, sometimes putting towns and populations far from mountainsides at risk.

PROVIDENCE, R.I. and WEST LAFAYETTE, Ind. — A new study may finally explain why some landslides travel much greater distances than scientists would normally expect. A team of researchers used a sophisticated computer model to show that vibrations generated by large slides can cause tons of rock to flow like a fluid, enabling the rocks to rumble across vast distances. (more…)

The Making of Antarctica’s Hidden Fjords

By Guest PostMarch 8, 2013Environmentantarctic ice sheet, Antarctica, antarctica topography, columbia university, cooling age, east antarctica, erosion rate, fjords, geologists, george e gehrels, geoscientist, geoscientists, glaciers, global climate, hidden fjords, ice sheet growth, lambert glacier, marine technician, mountains, national science foundation, ocean drilling program, pattern, peter w reiners, prydz bay, rock, rocks, sample, sea level change, sea-level rise, sediments, sidney r hemming, stuart n thomson, ty cobb, university of arizona

Antarctica’s topography began changing from flat to fjord-filled starting about 34 million years ago, according to a new report from a University of Arizona-led team of geoscientists.

Knowing when Antarctica’s topography started shifting from a flat landscape to one with glaciers, fjords and mountains is important for modeling how the Antarctic ice sheet affects global climate and sea-level rise. (more…)

UA Scientists Find Evidence of Roman Period Megadrought

By Guest PostNovember 6, 2011Environment, Scienceannual growth rings of trees, bristlecone pine tree, chronology, climate, cody routson, colorado river, connie woodhouse, core, dendrochronology, extreme drought conditions, geoscientists, jonathan overpeck, la niña, medieval period, multi decade drought period, primary drainage, rio grande, rocky landscapes of alpine or near alpine mountain slopes, san juan bristlecone pines, san juan drainage, san juan rivers, second century a d, shelley littin, south central colorado, southern san juan mountains, southwestern aridity, southwestern u.s, tree bark, tropical pacific ocean, university of arizona

*A new study at the UA’s Laboratory of Tree-Ring Research has revealed a previously unknown multi-decade drought period in the second century A.D. The findings give evidence that extended periods of aridity have occurred at intervals throughout our past.*

Almost nine hundred years ago, in the mid-12^th century, the southwestern U.S. was in the middle of a multi-decade megadrought. It was the most recent extended period of severe drought known for this region. But it was not the first.

The second century A.D. saw an extended dry period of more than 100 years characterized by a multi-decade drought lasting nearly 50 years, says a new study from scientists at the University of Arizona. (more…)

Tag Archives: geoscientists

Vibrations make large landslides flow like fluid

The Making of Antarctica’s Hidden Fjords

UA Scientists Find Evidence of Roman Period Megadrought