In a severe earthquake the ground moves like this, but in spite of numerous earthquakes that have hit the town of Pisa in central Italy, its famous Leaning Tower is still standing 646 years after it was finished.
University of Bristol professor George Mylonakis says it is because the tower stands on relatively soft ground that serves almost like a comfortable cushion. “The soil moves but the tower doesn’t move, like riding the waves. So hard the soil being stiff the waves would have hit the tower and the tower would have possibly if not probably collapsed.”
However, measurements taken over time showed that the tower continued to tilt,so in a major restoration project that started in 1990 and lasted over a decade.its foundation was stabilized and the tower was straightened by 45 centimeters.
“We are much more optimistic about the Tower of Pisa, the earthquakes there are more modest in magnitude and intensity.And the effect of the ground help that the tower receives from the ground is so important and so strong that we are optimistic that we’ll survive for hundreds if not thousands of years.”Latest measurements confirmed that the tilting has stopped and the tower is once again open for visits.
George Putic VOA News