How the Japan Earthquake Shortened Days on Earth
|This map shows the location of the March 11, 2011 earthquake in Japan, as well as the foreshocks (dotted lines), including a 7.2-magnitude event on March 9, and aftershocks (solid lines). The size of each circle represents the magnitude of the associated quake or shock.|
The massive earthquake that struck northeast Japan Friday (March 11) has shortened the length Earth's day by a fraction and shifted how the planet's mass is distributed.
A new analysis of the 8.9-magnitude earthquake in Japan has found that the intense temblor has accelerated Earth's spin, shortening the length of the 24-hour day by 1.8 microseconds, according to geophysicist Richard Gross at NASA's Jet Propulsion Laboratory in Pasadena, Calif.