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6.4 quake shakes northern Argentina, capital
BUENOS AIRES, Argentina—A magnitude-6.4 earthquake has struck north-central Argentina, shaking things up enough to make people evacuate some buildings in the capital hundreds of miles (kilometers) away.
The U.S. Geological Service says the quake’s epicenter was 80 miles (130 kilometers) southeast of Santiago del Estero, a provincial capital of 250,000 people and the 12th-largest city in Argentina.
It was centered deep underground, nearly 400 miles (600 kilometers) below the surface, where quakes generally cause less damage.
The shaking prompted people to spill out of the San Isidro courts building in Buenos Aires province Friday morning.
7.1 Quake strikes off Alaskan coast
An earthquake with a preliminary magnitude of 7.1 struck Friday off the coast of Alaska, the U.S. Geological Survey reported.
The quake was initially reported to have occurred a depth of 6.2 miles, but the Geological Survey later updated its reading to say it was 22 miles deep.
The earthquake occurred 120 miles east-southeast of Atka, Alaska, in a sparsely populated part of the Aleutian Islands known as the Fox Islands. The epicenter was 1,658 miles west southwest of Anchorage, the Geological Survey said.
It prompted a brief tsunami Read more…
Hurricane Irene Demonstrates Threats to Coasts As Climate Changes
Every hurricane season, climate scientists are asked how climate change is impacting hurricanes.
The short answer is that global warming makes the ocean warmer and increases sea surface temperatures, which can make hurricanes stronger. But several factors, including differences in wind speed and direction, can break up hurricanes. Many future projections show a decrease in the frequency of all hurricanes globally, but a higher chance of intense hurricanes forming when they do occur. The changing nature of hurricanes in a warmer world remains an active area of research.
In any case, focusing on climate change and hurricanes can obscure the consequences of less sensational climate-related threats to America’s coasts, including sea-level rise and more intense precipitation. Further, extreme Read more…
Giant Chunk of Greenland Ice Set to Break Away
In 2010, the Manhattan-sized Petermann glacier iceberg enters the Nares Strait: Credit: European Space Agency.An ice shelf is poised to break off from a Greenland glacier and float out to sea as an island twice the size of Manhattan, scientists say.
“I don’t know exactly when,” Jason Box, a climatologist with Ohio State Unversity’s Byrd Polar Research Center, told OurAmazingPlanet. “I wouldn’t be surprised if it happened today — or if it happened next summer.”
Just a year ago, in August 2010, the same glacier produced an even larger iceberg — a mass of ice four times the size of Manhattan, the largest in recorded Greenland history — yet researchers warn that the next spectacular break could have more-dire consequences.
Box said it’s not clear when the 62-square-mile (160 square kilometers) ice shelf, which is Read more…
Is China Planning a Surprise Missile Attack?
A retired Chinese general recently revealed that his country might be planning a surprise missile attack on the United States. The public comment of Xu Guangyu came in response to WikiLeaks revelations that last year Washington had warned its allies beforehand of China’s test of a missile interceptor.
Secretary of State Hillary Clinton, in a classified cable sent last January 9th, instructed American embassies in Australia, Britain, Canada, and New Zealand to notify those countries of upcoming Chinese launches two days later. The cable included details of the launch sites for the interceptor and the target, the models of Read more…
Nebraskans say a Canadian oil pipeline poses unacceptable risks
Part of the Keystone pipeline (solid line) is already working. Construction on Keystone XL (red dotted line) is supposed to start soon so oil can flow to the GulfThe 20,000 miles of pipes that carry oil and gas across Nebraska’s open prairies don’t bother Randy Thompson at all. Neither do greenhouse gas emissions or oil geopolitics.
Yet the 63-year-old, Republican-voting rancher and other Nebraska landowners have begun to kick up a lot of dust over the Keystone XL, a 1,711-mile pipeline that, if built, will cut across Nebraska’s heartland as it funnels oil from the Athabasca sands of Alberta, Canada, to Read more…
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