The tower’s insulation from earthquakes does not mean it can metaphorically thumb its nose at nearby, earthquake-ravaged buildings.
They expect to release the rest this month at the European Conference on Earthquake Engineering in Greece. The researchers have only released some of their findings. “Ironically, the very same soil that caused the leaning instability and brought the tower to the verge of collapse can be credited for helping it survive these seismic events,” Mylonakis told the website. So during a quake, the tower doesn’t shake as much as the earth beneath it, in further defiance of gravity. One of those quakes was greater than 6.0 on the Richter scale.Īccording to, the engineers determined that the tower’s height and stiffness, “combined with the softness of the foundation soil, causes the vibrational characteristics of the structure to be modified substantially, in such a way that the Tower does not resonate with earthquake ground motion.” The tower in northwestern Italy has managed to survive two world wars, millions of tourist visits and at least four strong earthquakes that have hit the region since 1280, according to. Professor George Mylonakis wanted to know why.
How can something so obviously structurally unsound endure in an earthquake-prone region for hundreds of years? People who assemble an IKEA cabinet and have 18 pieces left over don’t expect to pass a wobbly Hemnes down to their great-grandchildren.
The tower, during an earthquake, doesn’t shake as much as the earth beneath it, in defiance of gravity. (Tom Peterson/For the Washington Post) Partially constructed on unexpectedly soft soil, the ancient bell tower began to lean before it was even finished, a historical goof that went on to become one of the world’s historical oddities - and made the tower a UNESCO World Heritage site. The Leaning Tower of Pisa and its 5.5-degree lean has vexed engineers for centuries.
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