When Darío Solano-Rojas he moved from his hometown of Cuernavaca to Mexico City to study at the National Autonomous University of Mexico, and the establishment of that metropolis puzzled him. Not just the grid, don’t worry, but the way the construction site looks like a mess, like a photo taken. Solano – Rojas states: “To my surprise, it was all twisted and twisted. “At that moment, I didn’t know what it meant. I just thought, ‘Well, this city is so different from its homeland.’ ”
On the contrary, they have been found, in a very negative way. After studying soil science at the university, Solano – Rojas met with astronomer Enrique Cabral-Cano, who was investigating the mysterious cause of the building crisis: The city was sinking – a long time. It is the result of an ecological phenomenon called subsidence, which occurs most often when water rises from the ground surface, and the surface soil begins to interact. According to a new study by the two researchers and their colleagues, the city is sinking to 20 inches a year. In the next century and a half, they calculate, the area could be reduced to as much as 65 feet. The spots outside Mexico City rightly can sink 100 meters. Solano ist Rojas the twist and I see that it was just the beginning of the slow pace of 9.2 million people in the world’s busiest city.
The root cause of the problem is the poor foundation of Mexico City. The Aztecs built their capital, Tenochtitlan, on another island in Lake Texcoco, a valley in the foothills. When the Spanish arrived, they destroyed Tenochtitlan, killed its own people, and began to flood the sea and build on it. Gradually, the great city that became the modern Mexico City overflowed, until the lake became extinct.
And this led to a change that began to sink the city. As Mexico City’s seasick soil became wet, tiny particles of soil were disposed of in an unconventional way. Think about throwing plate in deep, willy-nilly-Their fixed routes allow more water to flow between them. But get rid of the water – as Mexican planners did when they first emptied the lake, and as the city has since done by knocking on the floor like a toilet – and these things regenerate themselves to be piled up, like cupboards. With a small space between the particles, the mud joins. Or think of it as applying a face mask. When the mask dries, you can feel it sticking to your skin. “They are losing water and losing energy,” says Solano – Rojas.
Mexican authorities have identified the problem in the late 19th century, when they saw houses sinking and began measuring. This gave Solano – Rojas and Cabral-Cano valuable information, which they combined with satellite testing over the past 25 years. By blowing the waves down, the pedestrians measure the detail – a view of 100 meters – as the mountains shift across the city.
Using this, the researchers found that it would take another 150 years for Mexico City’s mud to mix, although their new type suggests that lower prices will completely change in prices. (That’s why Solano – Rojas saw the construction work come when he first arrived.) When the soil is hard in a certain area, it dries quickly. Some areas, especially the outskirts of the city, are less resilient because they sit on rocks instead of in rubbish.
This sounds like a relief, but really enlargement the events because they make a dangerous difference. If the whole city sinks in the same way, it would be difficult, to be sure. But because some parts are very small while others are not, the structures that go through these two sections sink into other places but stay in the same place. And this threatens to break roads, metro regimes, and dirty roads. “Self-reliance would not be a big problem,” says Cabral-Cano. “But I am difference due to the magnitude of this crisis which puts all organizations under varying degrees of stress. ”
This is not just a Mexico City problem. Wherever people draw water from the ground, the soil responds. Jakarta, Indonesia stands up to ten inches year, and San Joaquin Valley of California did drowned 28 feet. “It has been around for centuries. The human mind was this [water] is infinitely more accessible, ”says Arizona State soil scientist Manoochehr Shirzaei, who limited education but I did not participate in this new study. “Wherever you want, you can dig in the ground and suck.” In the past, groundwater spraying has solved local problems – saving lives and crops – but it has led to long-term disaster. An earlier study this year found that by the year 2040, 1.6 billion people could be settled is affected by the decrease.