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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 exist and we will never know what a PGA of 2.99 is really like but to people in Miyagi this must have looked like the end of the world.
It becomes impossible to stand upright when PGA rezches 1.24, shaking in Miyagi must have been so extreme even if you lie down you will roll.
The rubble caused by an earthquake and tsunami fill the landscape in Yamada, Iwate Prefecture, Japan.
A man cycles by a ship at Hachinohe, Aomori Prefecture, northern Japan, Monday, March 14, 2011, three days after a powerful earthquake-triggered tsunami hit Japan's east coast.
Houses and infrastructures devastated by a strong earthquake and tsunami in Otsuchi, Iwate Prefecture, Monday March 14, 2011.
An aerial taken on March 14, 2011 during an AFP-chartered flight shows an area destroyed by the tsunami in Sendai in Miyagi prefecture .
Houses and infrastructures devastated by earthquake and tsunami in Otsuchi, Iwate Prefecture, Monday, March 14, 2011.
People walk a road between the rubble of destroyed buildings in Minamisanriku town, Miyagi Prefecture, northern Japan, Monday, March 14, 2011.
A car sits atop another in an area affected by an earthquake and tsunami in Miyako, Iwate prefecture March 14, 2011.
A man walks along a road lined with debris at Onagawa town in Miyagi prefecture on March 14, 2011.
pleasure boat sits on top of a building amid a sea of debris in Otsuchi town in Iwate prefecture on March 14, 2011.
A Japanese rescue worker walks through a destroyed residential area of tsunami-hit Otsuchi March 14, 2011.
A Japanese man walks through a destroyed residential area of tsunami-hit Otsuchi March 14, 2011.
Debris is strewn across a large area of land in Natori City.
Images provided by GeoEye show an area of Yuriage near Miyagi Prefecture, Japan on April 4, 2010, left, and March 12, 2011.
The 4,724-ton freighter M.V. Asia Symphony lies on a pier after being hit by the tsunami at the port in Kamaishi city, Iwate prefecture.
A rescue worker wipes his forehead after carrying a body from the rubble of a village destroyed by the devastating earthquake, fires and tsunami March 16, 2011 in Kesennuma, Miyagi province.
A Japanese Self Defense Force soldier wades through water as he checks for bodies in Kesennuma, Miyagi prefecture.
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 exist and we will never know what a PGA of 2.99 is really like but to people in Miyagi this must have looked like the end of the world.
It becomes impossible to stand upright when PGA rezches 1.24, shaking in Miyagi must have been so extreme even if you lie down you will roll.
The rubble caused by an earthquake and tsunami fill the landscape in Yamada, Iwate Prefecture, Japan.
A man cycles by a ship at Hachinohe, Aomori Prefecture, northern Japan, Monday, March 14, 2011, three days after a powerful earthquake-triggered tsunami hit Japan's east coast.
Houses and infrastructures devastated by a strong earthquake and tsunami in Otsuchi, Iwate Prefecture, Monday March 14, 2011.
An aerial taken on March 14, 2011 during an AFP-chartered flight shows an area destroyed by the tsunami in Sendai in Miyagi prefecture .
Houses and infrastructures devastated by earthquake and tsunami in Otsuchi, Iwate Prefecture, Monday, March 14, 2011.
People walk a road between the rubble of destroyed buildings in Minamisanriku town, Miyagi Prefecture, northern Japan, Monday, March 14, 2011.
A car sits atop another in an area affected by an earthquake and tsunami in Miyako, Iwate prefecture March 14, 2011.
A man walks along a road lined with debris at Onagawa town in Miyagi prefecture on March 14, 2011.
pleasure boat sits on top of a building amid a sea of debris in Otsuchi town in Iwate prefecture on March 14, 2011.
A Japanese rescue worker walks through a destroyed residential area of tsunami-hit Otsuchi March 14, 2011.
A Japanese man walks through a destroyed residential area of tsunami-hit Otsuchi March 14, 2011.
Debris is strewn across a large area of land in Natori City.
Images provided by GeoEye show an area of Yuriage near Miyagi Prefecture, Japan on April 4, 2010, left, and March 12, 2011.
The 4,724-ton freighter M.V. Asia Symphony lies on a pier after being hit by the tsunami at the port in Kamaishi city, Iwate prefecture.
A rescue worker wipes his forehead after carrying a body from the rubble of a village destroyed by the devastating earthquake, fires and tsunami March 16, 2011 in Kesennuma, Miyagi province.
A Japanese Self Defense Force soldier wades through water as he checks for bodies in Kesennuma, Miyagi prefecture.
