VIVAnews -Richard Gross, a researcher from the Jet Propulsion Laboratory, NASA devised a complex calculation model for mengalkulasikan theoretically, how the earthquake in Japan, which is the fifth largest earthquake since 1900, affect the Earth's rotation.
Utilizing data from the United States Geological Survey, the results of the calculation indicates a change in the distribution of mass of the Earth. Earthquake Japan has made the Earth spun slightly faster, and shorten time in one day up to 1.8 microsecond or a millionth of a second.
Calculation made also indicated that the axis of the Earth moves around the 17 centimeter toward East longitude. Change the axis this would make the movement of the Earth a little bit different. However it does not affect the position of the Earth in space because only external forces such as the gravity of the Sun, moon, and planets are able to change it.
About the short time in a day that was not achieved, for instance, with a magnitude 8.8 earthquake that occurred last year in Chile, the time in one day has been trimmed of 1.26 microsecond and shift the axis of the earth around 8 cm.
In fact, using similar calculations performed after the earthquake with a magnitude of 9.1 that hit Aceh in 2004, the time in one day has been reduced by 6.8 microsecond result bergesernya axis and shape of the Earth about 7 cm.
"Rotation of the Earth is constantly changing, and not only caused by the earthquake, but was also influenced by other factors such as wind in the atmospheric and oceanic currents," said Gross, as quoted from the Science Daily, , may 10, 2011. "How earthquakes affect the rotation of the earth depends on the scale, location, and how earthquakes happen," he said.
Gross mention, in the next one year, the time in a day can increase and decrease of around one millisecond or 550 times larger than the earthquake Japan. Similarly with the plates of the Earth that can be shifted about 1 meter in one year due to the variety of the earthquake.
"In theory, any capable meredistribusi the mass of the Earth will change the rotation of the planet Earth," said Gross. "However, the Earth's axis and rotation changes should not affect our daily lives. This change is very natural and occurs at any time. People don't need to worry, "he said.
Even though it has made the calculation, the calculation made Gross, good for the Earth's axis and rotation, the result will likely be still changed with the emergence of new data that is more accurate about the phenomena that occur on Earth. (umi)
Tuesday, May 10, 2011
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