earth-science16.055 min read
Yellowstone's Heat Source Traced to Shallow Mantle, New Study Finds
1 day ago•Source: Gizmodo
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5.73 min•12 days ago
Japan's Submarine Caldera Begins Recharging With New Magma
Using underwater seismic imaging, researchers mapped a large magma reservoir beneath Japan's Kikai caldera and confirmed the current magma is newly injected rather than leftover from the last eruption, with a lava dome forming over thousands of years. The findings suggest a recharging cycle for giant calderas and could improve monitoring of future eruptions at calderas like Yellowstone and Toba.
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Volcanoes That Talk: Tracing the Hidden Magma Highway Between Peaks
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Hidden Freshwater Beneath Great Salt Lake Could Help Douse Dust
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The Burren's Gray Limestone Carpet
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.
Turquoise Tides: Summer Eddies Roar in Canada's Arctic Fjord
NASA’s Image of the Day highlights the 2022 Arctic summer melt in Cañon Fiord, where sediment plumes and fractured sea ice trace swirling eddies in a branch of the Nansen Sound fjord system; turquoise waters reveal glacial flour carried by meltwater, and satellite data show Arctic glaciers in the Canadian Archipelago have been shrinking since the mid-2000s.
Antarctica's Icebound Lake Unter-See Nurtures Ancient-Style Stromatolites
NASA's Earth Observatory highlights Lake Unter-See in Antarctica, a deep, permanently ice-covered lake with unusually high dissolved oxygen, low CO2, and alkaline water that hosts tall conical stromatolites formed by cyanobacteria. These modern microbial reefs resemble Earth's earliest fossils and offer clues about life on icy worlds; a 2019 glacial flood increased water levels by about 2 meters, releasing 17.5 million cubic meters of meltwater and altering the lake's chemistry.
Lake Coatepeque: A Blue Caldera Seen from the ISS
NASA’s Earth Observatory highlights Lake Coatepeque in El Salvador, a blue caldera lake formed by ancient eruptions. A February 10, 2026 ISS image captures the surrounding volcanic landscape and the caldera’s rim near Santa Ana; while Santa Ana remains active, Coatepeque has had no eruptions in the Holocene. The lake’s sometimes turquoise color is linked to natural mineralization and pigments from microalgae/cyanobacteria. The image, taken with a Nikon Z9, illustrates the Central American Volcanic Arc and the human development around the lake.
Morocco Deep-Sea Wrinkles Hint at Ancient Chemosynthetic Life
Researchers in Morocco found wrinkle-like textures in 180-million-year-old deep-sea turbidites that likely formed from chemosynthetic microbial mats, not sunlight-driven algae, suggesting an ancient, dark-ocean ecosystem preserved in the rocks and prompting a rethink of wrinkle structures as indicators of life beyond sunlit waters.
Meltwater from Antarctic Giant Triggers South Atlantic Phytoplankton Bloom
A melting Antarctic iceberg, A-23A, released nutrient-rich meltwater as it drifted into warmer South Atlantic waters, fueling a large phytoplankton bloom detectable by NASA satellites (VIIRS on Suomi NPP and the PACE mission). Scientists say light conditions and nutrients from iceberg melt promote bloom formation, with implications for the marine food web and carbon cycling; the duration and full ecological impact remain under study.
Acidic Echinus Geyser Briefly Roars Back to Life at Yellowstone
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.
Blood Falls' Red Secret: Iron Oxide From Subglacial Bursts
A new Antarctic Science study suggests Blood Falls’ rust-red color comes from iron oxide formed when the Taylor Glacier's heavy subglacial brine experiences pressure-driven bursts, linking glacier dynamics to subglacial hydrology; climate-change effects on the region remain uncertain.
Storm Sparks UV Glows on Tree Tips Confirmed in the Wild
A Penn State–led team captured the first in-the-wild coronae—brief ultraviolet glows at leaf tips—during thunderstorms, logging 41 events on multiple tree species across the East Coast in about 90 minutes. Each glow lasts roughly three seconds and can hop between leaves. While coronae had been seen in laboratory tests, this study confirms they occur in nature and may light tens to hundreds of treetop leaves during a single storm, though the displays are invisible to the naked eye.
Greenland’s Hidden Ice Boils with Pasta-Style Convection
New computer modeling of Greenland’s ice sheet suggests deep plume-like structures arise from thermal convection—a heat-driven, slow churning process that may make some ice softer than previously thought. While this explains the plumes, researchers caution softer ice alone doesn’t automatically mean faster melt or higher sea-level rise, and further studies are needed to understand the full implications for the ice sheet’s mass balance and coastal impacts.