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آخرينبعدي
  1396/09/19
   How friction evolves during an earthquake (By simulating quakes in a lab, engineers study the way that friction changes along a fault during a seismic event)
  NGDIR News Section-- Using high-speed photography and digital image correlation techniques, engineers show that friction along a faultline has a complex evolution during an earthquake that is dictated, in part, by slip velocity: the sliding of the two sides of the fault against one another. By simulating earthquakes in a lab, engineers at Caltech have documented the evolution of friction during an earthquake -- measuring what could once only be inferred, and shedding light on one of the bigge.....[More]
  1396/09/18
   USGS on Fire: It's not a matter of
  NGDIR News Section-- It was a catastrophic, often heartbreaking equation at work in northern California these last few months: dryness or drought + vegetation + hotter temperatures + wind = wildfire. Wine country residents had little warning when wildfires ignited early October, late on a Sunday night, rapidly spreading with wind gusts as high as 50 miles per hour. A 5-year drought left the region parched. And last winter's heavy rains, though a welcome relief, kick-started abundant vegetatio.....[More]
  1396/09/13
   Ancient Earth's hot interior created 'graveyard' of continental slabs
  NGDIR News Section-- Plate tectonics has shaped the Earth's surface for billions of years: Continents and oceanic crust have pushed and pulled on each other, continually rearranging the planet's facade. As two massive plates collide, one can give way and slide under the other in a process called subduction. The subducted slab then slips down through the Earth's viscous mantle, like a flat stone through a pool of honey. For the most part, today's subducting slabs can only sink so far, to about.....[More]
  1396/09/12
   Supervolcanoes: A key to America's electric future?
  NGDIR News Section-- Researchers show that lake sediments preserved within ancient supervolcanoes can host large lithium-rich clay deposits. A domestic source of lithium would help meet the rising demand for this valuable metal, which is critical for modern technology. Most of the lithium used to make the lithium-ion batteries that power modern electronics comes from Australia and Chile. But Stanford scientists say there are large deposits in sources right here in America: supervolcanoes. .....[More]
  1396/09/11
   USGS publishes a new blueprint that can help make subduction zone areas more resilient
  NGDIR News Section-- Subduction zone events pose significant threats to lives, property, economic vitality, cultural and natural resources and quality of life. The tremendous magnitudes of these events are unique to subduction zones, and they can have cascading consequences that reverberate around the globe. The planet we live on is constantly shifting beneath our feet. Creeping along at speeds undetectable to you and me, Earth's massive tectonic plates are continually on the move, and nowh.....[More]
  1396/08/29
   Is the next gold mine in Bulgaria
  NGDIR News Section--While Bulgaria may not be the first country investors equate with gold mining, executives at one TSX Venture Exchange-listed company are sitting on pins and needles waiting for the drill results that could prove their high-grade thesis. Velocity Minerals Ltd. (VLC:TSX.V), one of the first movers for gold in Bulgaria, has entered into option agreements with Gorbuso-Kardzhali A.D., a private Bulgarian mining company, to earn 50% of the Ekuzya project and 70% of the Rozino pr.....[More]
  1396/08/24
   A Closer Look at an Undersea Source of Alaskan Earthquakes
  NGDIR News Section-- A systematic survey offers a striking portrait of movement along a 500-kilometer-long undersea section of the Queen Charlotte-Fairweather fault off the coast of southeastern Alaska. During the past century, movement along the Queen Charlotte-Fairweather fault, which lies for most of its length beneath the waters off southeastern Alaska and British Columbia, has generated at least seven earthquakes of magnitude 7 or greater. This includes a magnitude 8.1 earthquake in 1949.....[More]
  1396/08/22
   More than 210 killed by earthquake in Iran-Iraq border region
  NGDIR News Section-- Rescuers battle to find survivors trapped under collapsed buildings after the 7.3 magnitude quake. More than 210 people have been killed in Iran and Iraq after a magnitude 7.3 earthquake hit the border region between the two countries, state media said. At least 207 people have died in Iran, a spokesman for the country's disaster agency state television, after the powerful quake struck the country's western provinces at 9.20pm local time on Sunday. More than 1,700 were.....[More]
  1396/08/15
   Four systems out there and hurricane season hasn't even hit its peak yet
  NGDIR News Section-- Buckle your seat belts. Traffic is piling up in hurricane alley. This week, the Atlantic got busy with Tropical Storm Harvey and two waves churning westward as Hurricane Gert, which formed last week, disappeared into the North Atlantic. Warnings and watches were up across the Windward Islands as parts braced for Harvey, the ninth tropical cyclone of the season. While none of the current systems appears likely to intensify into major hurricanes, forecasters on Friday ga.....[More]
  1396/08/13
   NASA Flights Gauge Summer Sea Ice Melt in the Arctic
  NGDIR News Section-- Earlier this year Arctic sea ice sank to a record low wintertime extent for the third straight year. Now NASA is flying a set of instruments north of Greenland to observe the impact of the melt season on the Arctic's oldest and thickest sea ice. Operation IceBridge, NASA's airborne survey of polar ice, launched a short campaign on July 17 from Thule Air Base, in northwest Greenland. Weather permitting, the IceBridge scientists are expecting to complete six, 4-hour-long fl.....[More]
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