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Keyword: geology

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  • A powerful earthquake is shaking buildings in Mexico City

    02/16/2018 3:57:12 PM PST · by blueplum · 67 replies
    AP ^ | 16 Feb 2018 | AP
    happening now. USGS shows it as 7.5 M 7.5 - 2km SE of Pinotepa de Don Luis, Mexico no tsunami warning as yet breaking
  • Oldest fossils ever found show life on Earth began before 3.5 billion years ago

    12/19/2017 3:14:12 AM PST · by SkyPilot · 54 replies
    Science Daily ^ | 18 Dec 17 | University of Wisconsin-Madison Researchers
    Researchers at UCLA and the University of Wisconsin-Madison have confirmed that microscopic fossils discovered in a nearly 3.5 billion-year-old piece of rock in Western Australia are the oldest fossils ever found and indeed the earliest direct evidence of life on Earth. An example of one of the microfossils discovered in a sample of rock recovered from the Apex Chert, a rock formation in western Australia that is among the oldest and best-preserved rock deposits in the world. The fossils were first described in 1993 but a 2017 study published by UCLA and UW-Madison scientists used sophisticated chemical analysis to confirm...
  • From the Everglades to Kilimanjaro, climate change is destroying world wonders

    11/13/2017 10:55:22 AM PST · by Oldeconomybuyer · 31 replies
    The Guardian ^ | November 13, 2017 | by Damian Carrington
    From the Everglades in the US to the Great Barrier Reef in Australia, climate change is destroying the many of the greatest wonders of the natural world. A new report on Monday from the International Union for Conservation of Nature (IUCN) reveals that the number of natural world heritage sites being damaged and at risk from global warming has almost doubled to 62 in the past three years. Those at high risk include iconic places from the Galapagos Islands to the central Amazon and less well known but equally vibrant and unique sites such as the karst caves of Hungary...
  • Yellowstone Volcano-Related Earthquake Swarm?

    09/03/2017 12:30:37 AM PDT · by Oscar in Batangas · 71 replies
    USGS ^ | unpublished | Self
    37 quakes -one was 5.3 on the Richter scale- NE of Soda Springs, Idaho (southwest of Yellowstone) in the past 7 hours. Close enough to be of possible concern?) Suspicious action from a fairly quiet area.
  • Experiments cast doubt on how the Earth was formed

    08/14/2017 9:04:24 PM PDT · by Ernest_at_the_Beach · 55 replies
    <p>New geochemical research indicates that existing theories of the formation of the Earth may be mistaken. The results of experiments to show how zinc (Zn) relates to sulphur (S) under the conditions present at the time of the formation of the Earth more than 4 billion years ago, indicate that there is a substantial quantity of Zn in the Earth’s core, whereas previously there had been thought to be none. This implies that the building blocks of the Earth must be different to what has been supposed. The work is presented at the Goldschmidt geochemistry conference in Paris.</p>
  • Q&A: Robert Hazen on studying 'deep carbon'

    06/28/2017 12:31:55 PM PDT · by JimSEA · 5 replies
    Robert Hazen's field -- mineralogy -- might seem like the most appropriate scientific specialty for studying what's happening below Earth's surface. But, he says, that job requires partnering with scientists from as many different disciplines as possible. Over more than two decades, NSF supported Hazen's research to address fundamental questions about what happens to minerals in hot, high-pressure environments as found in the deep interiors of Earth and other planets, and how minerals interact with the molecules of living beings. Now, Hazen is working in an area where NSF has also made significant investments: the study of "deep carbon," or...
  • China landslide: At least 15 dead and more than 100 feared buried (Video at link)

    06/24/2017 7:19:53 PM PDT · by Ernest_at_the_Beach · 8 replies
    abc.net.au ^ | yesterday at 9:26pm
    Crews searching through the rubble left by a landslide that buried a mountain village under tons of soil and rocks in south-western China have found 15 bodies, but about 100 more people remain missing. Key points: 1,000 rescuers and dogs are looking for signs of lifeThis was the biggest landslide in the area since the Wenchuan earthquake, an official saidLandslide blocked two-kilometre section of river Xinhua, the official news agency, reported that about 1,000 rescuers were using detection devices and dogs to look for signs of life in an area that once held 62 homes and a hotel."We won't give...
  • At least 4 feared dead after tsunami in Greenland

    06/20/2017 9:51:56 AM PDT · by JimSEA · 6 replies
    CBC News ^ | 6/19/2017 | Mitch Wiles
    Four people are feared dead after tsunami waves struck the coast of Greenland on Saturday night. A 4.1 magnitude earthquake, which struck 28 kilometres north of the northwest village of Nuugaatsiaq, is believed to have partially triggered the tsunami, according to a report from Kalaallit Nunaata Radioa, the national broadcaster in Greenland. The local newspaper, Sermitsiaq, reported that the four feared dead were inside their home in Nuugaatsiaq when waves struck and swept the structure into the ocean. KNR says Nuugaatsiaq has been evacuated, adding that the waves also struck the communities of Uummannaq and Illorsuit. A helicopter and boats...
  • Can Volcanic Gas Levels Predict an Eruption?

    06/19/2017 1:25:15 PM PDT · by JimSEA · 18 replies
    EOS ^ | June 12, 2017 | Alexandria Branscomb
    Before a volcano erupts, there are usually signs of what’s to come; small earthquakes, heat emission, and ground swelling, to name a few, have all been observed to precede eruptions. Volcanologists also monitor the changing composition of gas emissions at volcanoes in the months leading up to an eruption. However, precursory variations in gas have not yet been verified to occur in volcanoes hosting active lava lakes. To find out if volcanic gas emissions might also be used to predict eruptions at lava lake–hosting, carbon-poor volcanoes, Aiuppa et al. looked at Chile’s Villarrica volcano. Villarrica towers 2847 meters over the...
  • Novarupta: The Most Powerful Volcanic Eruption of the 20th Century

    06/07/2017 10:44:30 AM PDT · by JimSEA · 4 replies
    Geology.com ^ | 06/07/2017 | Hobart King
    June 6th, 1912 The morning of June 6th arrived on the Alaska peninsula to find the area which is now Katmai National Monument being shaken by numerous strong, shallow earthquakes. The most powerful volcanic eruption of the 20th Century was about to begin – but very few people knew about it. The Alaska peninsula has a low population density today, but in 1912 it was even lower. Beyond the land shaken by the earthquake activity, the beginnings of this event were almost unnoticed. On June 6th, 1912, a tremendous blast sent a large cloud of ash skyward, and the eruption...
  • Extreme geothermal activity discovered beneath New Zealand’s Southern Alps

    06/03/2017 6:45:31 AM PDT · by JimSEA · 37 replies
    Science Daily ^ | 6/1/2017 | Rupert Sutherland, et al
    An international team, including University of Southampton scientists, has found unusually high temperatures, greater than 100°C, close to Earth's surface in New Zealand -- a phenomenon typically only seen in volcanic areas such as Iceland or Yellowstone, USA. The researchers made the discovery while boring almost a kilometre into the Alpine Fault, the major tectonic boundary between the Australian and Pacific plates -running the length of the country's South Island. The team was working to better understand what happens at a tectonic plate boundary in the build-up to a large earthquake. The Deep Fault Drilling Project (DFDP) borehole, was drilled...
  • Mount Everest's Hillary Step collapses, mountaineers confirm

    05/21/2017 6:11:22 PM PDT · by blueplum · 67 replies
    ABC News Australia ^ | 21 May 2017 5:30 PDT | staff writers
    A famous feature near the summit of Mount Everest, known as the Hillary Step, has collapsed, potentially making the world's highest peak even more dangerous for climbers. Last year, pictures appeared to show a change in shape to the 12-metre rocky outcrop, named after Sir Edmund Hillary, the first person to scale the mountain. It is thought to have been destroyed in Nepal's 2015 earthquake, but snow coverage made the news hard to confirm. British mountaineer Tim Mosedale confirmed the collapse after he reached the summit this week. "It's official — The Hillary Step is no more," he said in...
  • New theory on how Earth's crust was created

    05/08/2017 1:25:53 PM PDT · by JimSEA · 28 replies
    Science Daily ^ | 5/5/2017 | Don R. Baker, et al
    More than 90% of Earth's continental crust is made up of silica-rich minerals, such as feldspar and quartz. But where did this silica-enriched material come from? And could it provide a clue in the search for life on other planets? Conventional theory holds that all of the early Earth's crustal ingredients were formed by volcanic activity. Now, however, McGill University earth scientists Don Baker and Kassandra Sofonio have published a theory with a novel twist: some of the chemical components of this material settled onto Earth's early surface from the steamy atmosphere that prevailed at the time. First, a bit...
  • 'Nesting doll' minerals offer clues to Earth's mantle dynamics

    04/09/2017 1:06:59 PM PDT · by JimSEA · 11 replies
    Science Daily ^ | 4/7/2017 | Carnegie Institution for Science
    Recovered minerals that originated in the deep mantle can give scientists a rare glimpse into the dynamic processes occurring deep inside of Earth and into the history of the planet's mantle layer. A team led by Yingwei Fei, a Carnegie experimental petrologist, and Cheng Xu, a field geologist from Peking University, has discovered that a rare sample of the mineral majorite originated at least 235 miles below Earth's surface. Their findings are published by Science Advances. Majorite is a type of garnet formed only at depths greater than 100 miles. Fascinatingly, the majorite sample Fei's team found in Northern China...
  • Oroville 27 March Update "A Day in the Life"

    03/28/2017 5:52:20 PM PDT · by CedarDave · 9 replies
    Blancolirio YouTube Channel ^ | March 27, 2017 | Juan Browne
    DWR just turned the main spillway off as the Reservoir Elevation reaches 836' (Mean Sea Level), the minimum level of the Main Spillway.
  • Sand dunes but no beach; a Martian breeze

    03/13/2017 9:28:11 PM PDT · by Rabin · 17 replies
    oilpro ^ | 22 hours ago | Brian Ricketts
    Despite the obvious similarities between Martian and Terrestrial dunes, one in-depth analysis has led a couple of researchers (Gary Kocurek and Ryan Ewing, see below) to suggest that there are also important differences.
  • Diamond’s 2-billion-year growth charts tectonic shift in early Earth’s carbon cycle

    02/24/2017 6:09:37 PM PST · by JimSEA · 8 replies
    Science Daily ^ | 2/23/2017 | S. Timmerman
    A study of tiny mineral 'inclusions' within diamonds from Botswana has shown that diamond crystals can take billions of years to grow. One diamond was found to contain silicate material that formed 2.3 billion years ago in its interior and a 250 million-year-old garnet crystal towards its outer rim, the largest age range ever detected in a single specimen. Analysis of the inclusions also suggests that the way that carbon is exchanged and deposited between the atmosphere, biosphere, oceans and geosphere may have changed significantly over the past 2.5 billion years. 'Although a jeweller would consider diamonds with lots of...
  • A supervolcano caused the largest eruption in European history. Now it’s stirring again.

    12/22/2016 7:41:58 PM PST · by JimSEA · 31 replies
    Washington Post ^ | 12/21/2016 | Sarah Kaplan
    The Italian name for the caldera — Campi Flegrei, or “burning fields”— is apt. The 7.5-mile-wide cauldron is the collapsed top of an ancient volcano, formed when the magma within finally blew. Though half of it is obscured beneath the crystal blue waters of the Mediterranean, the other half is studded with cinder cones and calderas from smaller eruptions. And the whole area seethes with hydrothermal activity: Sulfuric acid spews from active fumaroles; geysers spout water and steam and the ground froths with boiling mud; and earthquake swarms shudder through the region, 125 miles south of Rome. And things seem...
  • Why Do So Many Big Earthquakes Strike Japan?

    11/23/2016 11:45:55 AM PST · by JimSEA · 41 replies
    Live Science ^ | 11/22/2016 | Denise Chow
    A magnitude-6.9 earthquake struck yesterday off the coast of Fukushima, Japan, likely along the same fault that ruptured in 2011, unleashing a massive 9.0-magnitude temblor that triggered deadly tsunamis and caused widespread destruction. Over the course of its history, Japan has seen its share of shaking, but what makes this part of the world so susceptible to big earthquakes? The answer has to do with Japan's location. The island nation lies along the so-called Pacific Ring of Fire, an imaginary horseshoe-shaped zone that follows the rim of the Pacific Ocean, where many of the world's earthquakes and volcanic eruptions occur....
  • Rip in crust drives undersea volcanism

    11/16/2016 8:01:44 AM PST · by JimSEA · 26 replies
    Science Daily ^ | 11/14/2016 | Lamont-Doherty Earth Observatory
    Scientists analyzing a volcanic eruption at a mid-ocean ridge under the Pacific have come up with a somewhat contrarian explanation for what initiated it. Many scientists say undersea volcanism is triggered mainly by upwelling magma that reaches a critical pressure and forces its way up. The new study says the dominant force, at least in this case, was the seafloor itself -- basically that it ripped itself open, allowing the lava to spill out. The eruption took place on the East Pacific Rise, some 700 miles off Mexico. "Mid-ocean ridges are commonly viewed as seafloor volcanoes, operating like volcanoes on...