Home › Forums › BikeMeet Cafe › Japan Quake May Have Shortened Earth Days
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- March 15, 2011 at 10:34 am #14369ChampsParticipant
The March 11, magnitude 9.0 earthquake in Japan may have shortened the length of each Earth day and shifted its axis. But don’t worry—you won’t notice the difference.
Using a United States Geological Survey estimate for how the fault responsible for the earthquake slipped, research scientist Richard Gross of NASA’s Jet Propulsion Laboratory, Pasadena, Calif., applied a complex model to perform a preliminary theoretical calculation of how the Japan earthquake—the fifth largest since 1900—affected Earth’s rotation. His calculations indicate that by changing the distribution of Earth’s mass, the Japanese earthquake should have caused Earth to rotate a bit faster, shortening the length of the day by about 1.8 microseconds (a microsecond is one millionth of a second).
The calculations also show the Japan quake should have shifted the position of Earth’s figure axis (the axis about which Earth’s mass is balanced) by about 17 centimeters (6.5 inches), towards 133 degrees east longitude. Earth’s figure axis should not be confused with its north-south axis; they are offset by about 10 meters (about 33 feet). This shift in Earth’s figure axis will cause Earth to wobble a bit differently as it rotates, but it will not cause a shift of Earth’s axis in space—only external forces such as the gravitational attraction of the sun, moon and planets can do that.
Source https://www.nasa.gov/topics/earth/features/japanquake/earth20110314.html
March 17, 2011 at 9:40 pm #62255RadarModeratorWow! I have also read that the entire comtry has been shifted slightly too.
I used to work for a Japanese company called Koito and their base is some 300 miles south of the main area to be hit, but even at this distance the building were shaken pretty strongly.
Scarey stuff, the TV pictures of the wave coming in were just chilling and God alone knows what the final outcome will be at the nuclear plant
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