Two strong earthquakes rocked Antarctica
The epicenter of the first, a magnitude 6.6 temblor, was at a depth of 10 kilometers (six miles), some 539 kilometers (334 miles) west of Coronation Island, the USGS said. No destructive tsunami was created, according to a US-based warning center.
The first quake occurred at 1340 GMT. About 40 minutes later the region was struck by an aftershock measured at 6.2. A second 5.1-magnitude aftershock occurred at around 1640 GMT, USGS said later.
The South Orkney Islands form a remote archipelago in the Southern Ocean to the northeast of the Antarctic Peninsula.
An ownership dispute between Britain and Argentina was resolved by the 1959 Antarctic Treaty, which allowed for any of the 12 signatories to use the islands for non-military purposes.
The British Antarctic Survey staffs a small research station on Signy Island, while Argentina maintains a base on Laurie Island.
"There is the small possibility of a local or regional tsunami that could affect coasts located usually no more than a few hundreds kilometers from the earthquake epicenter," the Hawaii-based Pacific Tsunami Warning Center said.
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Rare caterpillar-like horizontal earthquake discovered
Imagine that, as you sit at your desk or in your living room reading this story, your entire city suddenly snaps a foot to the south.
That's what happened to the city of Kohat, Pakistan, in 1992. A magnitude-6.0 earthquake moved a 30-square-mile (80-square-kilometer) swath of land one foot (30 centimeters) horizontally in a split second, leveling buildings and killing more than 200 people.
The area hadn't experienced many temblors before, making the earthquake an unusual occurrence. Now, 20 years later, geologists have used satellite and seismic data to track down the cause of that rare quake — an equally rare type of fault.
"The pattern we saw was absolutely a dead ringer for a horizontal fault," said Roger Bilham, a geophysicist at the University of Colorado at Boulder. "But here's the problem: How do you get a horizontal earthquake?"
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