How the Myanmar earthquake shook the skyscrapers in Bangkok

More than 600 miles dismissed the earthquake center on Friday in Myanmar from the skyscrapers in Bangkok, which was swinging and was affected on the vast capital of the capital. There are even 33 floors of spread over construction. How can shake in Bangkok, the Thai capital, are connected to a very long earthquake?

The answer includes low -frequency seismic waves, which are able to travel vast distances and make tall buildings swing.

When a large earthquake strikes, it radiates at one time different frequencies of shaking. Some produce a fast and back reason, others swing low frequency.

This was true on Friday, when the earthquake in Myanmar produced violent and high -frequency seismic waves; They destroyed low -height buildings, Buddhist equipment and other structures near the earthquake center outside Mandalay, the second largest city in Myanmar. Many destroyed places of brick and construction are manufactured, fragile materials vulnerable to this type of shaking.

Upon launch from an earthquake, high -frequency seismic waves are spread through the inner part of the Earth, where they dissipate. On the contrary, low frequency waves travel along the Earth's crust and larger distances.

During the 7.9 -magnitude Denali earthquake in Alaska in 2002, low frequency waves have traveled so far until they caused water in swimming pools and ponds in a long time such as Texas and Louisiana – without damage, but for about half an hour, according to NASA.

These types of seismic waves also have a special resonance with long buildings.

Like synthesis, which produces different sounds depending on their size, buildings interact differently with earthquakes depending on their design, especially their height.

The 10 -storey building may require swing from one side to another during an earthquake, while a 50 -storey building may take five seconds to complete the same movement, and it stimulates nausea back and forth.

Low -frequency seismic waves were a major factor in an earthquake in 1985, when nearly 900 buildings collapsed in Mexico City, the country's capital, partly or completely. The widespread destruction was at the beginning of seismicists and engineers because the relatively length of the earthquake was a relatively long distance, more than 200 miles to the west of the city.

They concluded that the seismic waves resonated with a certain force through the clay and silt soil in the city, which is a strict factor in the earthquake and beyond.

A similar dynamic was played last Friday. Since the low tremors of the vibrant frequencies across the mainland in Southeast Asia, it was amplified in the Thai capital and around it, because the city is based on the soft soil of the Zhao Braia River Delta.

In recent years, scientists say they have reduced the potential of this soft soil to make earthquakes more dangerous. The engineers are compared to the construction of a building on a bowl-O.

In addition to Bangkok, Mexico City, Los Angeles, downtown San Francisco, Seattle and Tokyo, all cities are subject to the so -called pelvic effects, which can double the destructive power of earthquakes, especially in low frequencies.

In Mexico in 1985, seismic waves frequencies were decisive to understand the damage caused by the earthquake. A team of American scientists concluded in a report published by the Ministry of Commerce in 1987 that most of the severe damage “was confined to buildings within a scale from seven to 18 floors.” They said the reason for this was a mixture of low seismic waves of frequencies that reach the city and the construction that was weak in those frequencies.

The report indicated that “the low -off low building buildings were generally good, as did the stone colonial churches and government offices.” Ironically, these are the types of buildings that engineers consider most vulnerable to shaking near the earthquake center.

Until the fifties of the last century, many American engineers built tall buildings in earthquakes, according to Thomas E. Hitton, Fakhri Professor at the California Institute of Technology, who spent his five -year career in studying the effects of the large capacity earthquake on buildings.

He said that the prevailing wisdom is to build stronger and more solid buildings. But that has changed over the contracts, and today's skyscrapers are more flexible.

Dr. Heaton says that the flexible design of modern skyscrapers works well with sizes of sizes about 6, which occurs frequently. But it is very concerned about the consequences of the less frequent and larger earthquakes, which highlighted the weakness of long buildings. This list includes an earthquake of 7.8 degrees, killing more than 50,000 people in Türkiye two years ago.

Dr. Hiton says that the tremendous rift is rupture under a modern city – a direct blow – will be a devastating for long buildings, regardless of engineering reserves.

He said that the violent movement of the Earth is wrong, as seismologists, as the seismologists call it, would cause a high height, which may leave the upper floors unaccredited.

He said: “When you take the base of the building and move it several meters in less than seconds, there is nothing that the structural engineer can do to stay in a straight position.” “Certainly I don't want to be in a tall building during a big earthquake.”

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