If the day starts to feel shorter, here’s why

The earthquake that killed more than 700 people in Chile on Feb. 27 probably shifted the Earth’s axis and shortened the day, a National Aeronautics and Space Administration scientist said.

Earthquakes can involve shifting hundreds of kilometers of rock by several meters, changing the distribution of mass on the planet. This affects the Earth’s rotation, said Richard Gross, a geophysicist at NASA’s Jet Propulsion Laboratory in Pasadena, California, who uses a computer model to calculate the effects.

“The length of the day should have gotten shorter by 1.26 microseconds (millionths of a second),” Gross, said today in an e-mailed reply to questions. “The axis about which the Earth’s mass is balanced should have moved by 2.7 milliarcseconds (about 8 centimeters or 3 inches).”

Thanks To Keith at BagOfNothing

Big Picture: Chile, three days later

Three days after one of the largest earthquakes ever recorded struck the South American nation of Chile, the massive extent of the damage is becoming clearer, and the number of known victims has climbed to 723 deaths so far, many thousands still missing, and nearly 2 million displaced. World governments made immediate pledges of aid after Chilean President Michelle Bachelet requested mobile bridges, field hospitals, satellite phones, electrical generators, disaster assessment teams, water purification systems, field kitchens and restaurants, UN officials said. Collected here are recent photos from areas in Chile damaged by Saturday's 8.8-magnitude earthquake and ensuing tsunami. (37 photos total)

Click the image to see the full collection. Warning: Some images are graphic.