Peak ground acceleration measures how hard the earth shakes in a given geographic area during an earthquake.
PGA during the Tohuku Earthquake was 2.99 g, shaking so violent people and furniture were thrown into the air in Miyagi Prefecture, 75 km from the epicentre.
No footage from the area...
In an unprecedented move today, the United States Geological Survery changed the magnitude of the Tohoku earthquake in Japan to magnitude 9, making it one of the most powerful earthquakes on record.
Scientists at the USGS rarely overdramatize in their summaries of big earthquakes and initially...
[Courtesy CNN]
Tokyo (CNN) -- An 8.8-magnitude earthquake hit Japan early Friday, triggering tsunami warnings and sending people fleeing out of buildings in the capital.
The quake rattled buildings and toppled cars off bridges and into waters underneath. In Tokyo, crowds huddled together and...
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