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Science > Nature
Nature
Japan Earthquake Shifts Earth's Axis
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March 12th, 2011, 09:52 GMT| By *Tudor Vieru*
The Honshu earthquake spawned 100+ aftershocks of magnitude 5 or greater
Enlarge picture
*Seismologists, geologists and astronomers are beginning to come to
terms with the scale of the megathrust earthquake that struck Japan
at 05:46 UTC (14:46 Tokyo time) on March 11, 2011. The tremor was found
to have shifted Earth's axis, as well as the country's shorelines. *
Dr. Dave Applegate, an expert with the United States Geological Survey
(USGS), says that the planetary axis was permanently shifted by about 10
inches (25.4 centimeters) as a result.
Additionally, early measurements have also demonstrated that the
Japanese shorelines were permanently shifted by as much as 2.4 meters
(7.8 feet) as well, the Vancouver Sun
reports.
Similar effects were recorded after the 8.8-magnitude earthquake that
slammed the coasts of Chile at the beginning of 2010. That event shifted
cities all over South America by several inches.
The tremor struck Chile on February 27, and was later established to be
the fifth-strongest in recorded history. It was also one of the most
interesting to study, from a geological perspective.
It would appear that scientists have a great deal to learn from it, and
also from the changes that it caused to the planet. It apparently nudged
our planet's figure axis off-course by a few inches, and experts
revealed that it also shifted entire cities several meters in specific
directions.
The Chilean city of Concepcion had it worst off. Precise comparison of
GPS measurements taken before and after the tremor appears to indicate
that the entire urban center has been moved about 10 feet (roughly 3
meters) to the west.
In Japan, the effects were even more severe because the geological event
that led to the tremor were produced when fault lines around the country
ruptured a180 mile by 50 mile (190 by 80 kilometer) section of the
planetary crust.
In less than 24 hours after the original, 8.9-magnitude earthquake
struck, automatic measurement networks captured more than *100
aftershocks of magnitude 5 or higher*
,
and countless other of lower magnitudes, the USGS expert adds.
He goes on to say that the 2011 Honshu earthquake bumped directly into
more than 250 miles of Japanese coastlines, which is why it caused such
widespread damage. The ensuing tsunamis reached a maximum height of
about 32 feet (nearly 10 meters).
At this point, preliminary reports show that the earthquake, aftershocks
and ensuing tsunamis killed more than 503 people in Japan (and a
yet-unconfirmed person in California). About 784 people are currently
declared missing.
These tolls may soon change, however, so keep an eye on this space for
updates.
*Follow the editor on Twitter @tudorvieru *
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TAGS:
earthquake | tremor
| Tokyo
| Japan
| Honshu
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