Skyscraper that may cause earthquakes

[Celebration]

http://www.guardian.co.uk/science/story/0,3605,1655977,00.html

Taipei 101 is a building with a lot to boast about. Standing 508 metres (1,667ft) high, it is the world's tallest. And at 700,000 tonnes, it must be among the heaviest.

But the sheer size of the Taiwan skyscraper has raised unexpected concerns that may have far-reaching implications for the construction of other buildings and man-made megastructures. Taipei 101 is thought to have triggered two recent earthquakes because of the stress that it exerts on the ground beneath it.

According to the geologist Cheng Horng Lin, from the National Taiwan Normal University, the stress from the skyscraper may have reopened an ancient earthquake fault. If he is right, then it raises concerns about proposals such as Sky City 1000 in Japan, the vertical city that has been proposed to solve Tokyo's housing problems. And it is not just skyscrapers that are a problem. Dams and underground waste deposits may also cause rumblings if they become too large.

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Using the construction information, Dr Lin has calculated how much pressure Taipei 101 exerts on the ground. The weight of steel and concrete came to more than 700,000 tonnes. This is spread over an area of 15,081 square metres (3.7 acres), meaning that it exerts a huge pressure of 4.7 bars on the ground below. "The construction of Taipei 101 is totally different to many other high-rise buildings because it used hybrid structures made of both concrete and steel, to give it added protection from earthquakes and fire. Therefore it has a huge vertical loading on its foundation," says Dr Lin.

[LeftCoast]

1. Very interesting

Thanks for posting that!