Link R&D Centre sets a new world record
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Following is the article from The Press:
'World-record' shaker
Heathcote residents experienced the world's strongest recorded up-and-down shaking during last month's earthquake.
Equipment in a Heathcote Valley School building measured peak ground accelerations more than 2.2 times that of gravity only three seconds into the magnitude-6.3 quake.
The maximum downward ground acceleration was about 0.9 that of gravity (0.9g). Horizontal ground motion hit close to 1.7g.
Canterbury earthquake engineer Dr John Berrill said the 2.2g acceleration upwards was a record. "The downward, negative acceleration peaks are all less than 1g, whereas five positive peaks are in excess of 1g. This suggests that the building was left behind, in the air, as the ground accelerated downwards beneath it, with the building then falling under its own weight at near 1g until it impacted on the ground. In the upwards direction, it goes at the acceleration of the underlying ground, greater than 1g."
In Japan's magnitude-9.0 quake, peak horizontal ground accelerations hit 2.7g and vertical motion hit 1.88g.
- The Press
Read previous Link earthquake news itemsOther general articles about the earthquake can be found on Stuff, TV3 and TVNZ
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