All articles tagged with #geology
A CCTV video of Myanmar's 2025 Mw 7.7 earthquake lets researchers directly quantify a 2.5-meter horizontal slip in 1.3 seconds, peaking at 3.2 m/s and revealing a slightly curved fault path, supporting pulse-like rupture models and highlighting the value of real-time visual data for understanding earthquake dynamics and risk.
Using airborne electromagnetic surveys, researchers found a large freshwater reservoir beneath the Great Salt Lake, saturating sediments under the eastern margin and a basement depth deepening from hundreds of yards to over 2.5 miles; while promising, the survey covered only part of the lake, so the full freshwater volume remains uncertain.
A three-sided, pyramid-like feature in Mars’ Candor Chasma sparked alien- civilization theories, but scientists say it’s a natural wind-eroded mound within the canyon, not evidence of ancient artifacts or intelligent design.
Researchers traced pink granite boulders on the Hudson Mountains to a hidden, roughly 100 km-wide and 7 km-thick granite body beneath Pine Island Glacier in West Antarctica. U-Pb zircon dating suggests the granite formed about 175 million years ago in the Jurassic, and airborne gravity surveys show a buried-granite density signature supporting the link. The discovery helps explain the past movement of the glacier and will improve models of West Antarctic Ice Sheet evolution and sea‑level rise.
New evidence confirms the Silverpit Crater beneath the North Sea was formed by a ~160-meter asteroid at ~15 km/s in the middle Eocene (43–46 million years ago), generating a tsunami over 100 meters high within minutes.
An international team reports a 900-kilometer tektite strewn field in Minas Gerais, Brazil, dating to as much as 6.3 million years ago, evidence of a large meteorite impact, but the crater has not yet been found; researchers hope magnetic and gravimetric studies will reveal its ring-shaped footprint near the field.
NASA’s Earth Observatory highlights Ireland’s Burren region, where gray limestone pavement formed about 325 million years ago during the Carboniferous and was later folded in the Variscan Orogeny. Erosion and glacial activity carved terraces and exposed karst features called grikes, creating a rugged landscape with pockets of vegetation such as shamrock. The image, captured by Landsat 8’s OLI on May 16, 2025, showcases how tectonics, weathering, and ice shaped this distinctive Irish terrain.
NASA's Curiosity rover has been studying large, spiderweb-like boxwork ridges on Mount Sharp, suggesting groundwater once moved through bedrock fractures and mineralized them while surrounding rock eroded away. Analyses of drilled samples have found clay minerals in ridge material and carbonates in hollows, with a later wet-chemistry test probing for organics and nodules observed along ridge sides. The findings imply longer-lived ancient water activity on Mars and guide the rover's continued exploration of sulfate-rich layers up the mountain.
A 50,000-year-old meteor impact crater near Winslow, Arizona — Meteor Crater — remains the best-preserved terrestrial impact site, serving as a natural laboratory for shock metamorphism and the effects of hypervelocity impacts. Its 4,000-foot diameter and 700-foot depth offer crucial data on Earth's impact history and inform comparisons to planetary surfaces and past biosphere changes, including mass extinction scenarios like the dinosaur wipeout.
Arizona’s Meteor Crater, formed about 50,000 years ago, remains the best-preserved Earth impact site and a living laboratory for studying impact processes. Ongoing fieldwork, lab analyses, and computer studies—supported by Barringer Family Fund grants—continue to produce new data, with researchers like Dan Durda saying the crater provides new insights every year and climate and geological processes can obscure other craters elsewhere.
Researchers mapped a deep, 22‑mile tear forming in the Cascadia margin offshore Vancouver Island, where the Nootka Fault Zone is ripping a fragment from the downgoing plate. The tear could progress into a slab window and alter heat and melting patterns, but it does not change the region’s megathrust hazard yet; the finding helps scientists model how ruptures might propagate through a segmented boundary.
Scientists tracing Germany’s dormant Lake Laach volcano logged over 1,000 microearthquakes in a year, mapping a buried, tilted magma reservoir that leans toward the Neuwied Basin. Using 500 sensors and a fiber-optic line, they see a crustal system likely driven by moving fluids, which could indicate pressure changes but does not prove an eruption is imminent. The study, published in Geophysical Journal International, reframes the area as an active, watch-worthy volcanic field with a new baseline for monitoring future unrest.
Yellowstone’s Norris Geyser Basin has seen the acidic Echinus Geyser erupt again since February, with bursts every 2–5 hours reaching 20–30 feet—the first sustained activity since 2017. Experts note the eruptions may last only a month or two before dormancy returns, and it’s uncertain whether they’ll continue into summer due to the geyser’s rare chemistry that allows acidic waters to coexist with a relatively intact plumbing system.
A 900-km-wide field of tektites—natural glass formed by a meteorite impact about 6.3 million years ago—has been identified across Minas Gerais, Bahia, and Piauí in Brazil, with about 500 specimens collected and named geraisites. The glass is silica-rich and extremely dry, providing new clues about South America’s ancient impact history, though the crater responsible has not yet been found (likely somewhere in the São Francisco Craton).
A 3.5-kilogram piece of rare rumanite amber found near a Romanian stream, once used as a doorstop, was authenticated as one of the world’s largest intact amber specimens and valued at about €1 million, now classified as a national treasure and housed at the Buzău Provincial Museum.