Tag Archives: Geology

How to build megaripples out of sand

Sorting of grains by steady winds produces rare formations larger than ripples but smaller than dunes. Continue reading

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A Kilauea eruption like no other

The famously active Hawaiian volcano typically erupts at existing fissures and triggers minor earthquakes. This latest event has no such limitations. Continue reading

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Watching How Rare, Meteoric Diamonds Form

A shock collision experiment maps hexagonal diamond’s transition from graphite in real time.   Continue reading

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Decoding an asteroid’s magnetic history

Meteorite samples show that metal asteroids exhibited dynamo activity while they solidified from the outside in. Continue reading

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Continental rift exposes mantle melting at work

Changes in the degree of melting of mantle rock explain uplift and subsidence patterns in New Zealand’s Taupo Volcanic Zone. Continue reading

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Separating pebbles from boulders on asteroid Itokawa

Collisions between fragments may lead to size segregation of rock piles during asteroid formation. Continue reading

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Active Mud Volcano Field Discovered off Southeast Alaska

A cruise to study landslide potential along an earthquake-prone fault found a surprising methane plume. Continue reading

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Building Sea-floor Features in the Lab

Researchers in Canada investigate overpressures needed to form ocean-floor domes. Continue reading

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Explaining Sheeting Joints on Yosemite’s Half Dome

The fractures that lead to rockfall on Yosemite National Park’s Half Dome are best explained by curvature and forces parallel to the rock surface. Continue reading

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