One Friday for the rest, with the top of the G20 in her awakening, the armored Buenos Aires lived unthinkable: an earthquake of 3.8, which had its epicenter at 10.27, about 30km from La Plata, near the Esteban Echeverria party.
At the Central Observatory of the meteorological service, the only seismometer in the city of Buenos Aires is functioning at the Buenos Aires settlement at Vila Ortusar, which was brought by the Director of the Faculty of Engineering of the ABA Faculty of Engineering, Raul Bertero.
"Despite the rarity, The truth is that I was not surprised by the earthquake, because we are waiting for it from 2014, when I visited the seismograph in our laboratory. Yes, I admit that it happened much earlier than I imagined, but I was expecting it, "said Berthero, who adds."There will be other stronger, but for a longer time"
Why is a seismograph laboratory in a city like Buenos Aires, virtually devoid of earthquakes? "Because of the events that took place in the area in the 19th century and because of what we know is happening in Chile, this city, in addition to the type and scope of the building, deserves to have a scientific study"
To face the seriousness, "it was necessary to have a device that recorded the acceleration of the soil when an earthquake occurred at a certain width, so we placed a decree with the dean who was in 2014, and the faculty invested about $ 20,000 that brought them USA. "
"That the seismometer is in place of the facts is changing, because we measure as a seismic wave arriving directly to the land of Buenos Aires. Having a seismometer farther from the seismic movement, it registers waves, but not as they are, because they lose intensity according to the distance it passes, "explains Bertero, also a deputy dean at the Faculty of Engineering at ABA.
"Every place where an earthquake happens, there is soil with different characteristics". Buenos Aires has 300 meters of soil above the rock, which affects the way you feel Seismic Movement in Capital ".
In 1888, in Rio de la Plata there was an earthquake of high intensity: 5.5 degrees on the Richter scale, which caused major damage and even a tsunami, although there were no casualties. "An earthquake that happens every 100 years in this region, which has low seismicity, while an earthquake like this Friday It has a probable repetition period and can occur every ten years"
Bertero emphasizes that it is necessary to understand that "there is a possibility that there are local earthquakes such as this and even slightly larger, so it would be important to update the seismic regulations." Who should be responsible? "We have a National Institute for Seismic Prevention (INPRES) in San Juan that has done a great job in making seismic standards for our country, but I think should adapt some aspects, especially regarding seismic actions in Buenos Aires"
Berthero says the most serious tremor was in five or six-storey buildings, "where the largest reinforcement of the seismic wave has been observed." Not all objects feel the same, because they vibrate at different frequencies according to the height they have. One is if one goes to the sidewalk, and another one is in the kitchen on the fifth floor. "
Beyond fear and rarity, the Buenos Aires quake is equivalent to a small earthquake, with very little energy, practically harmless, which may remain unnoticed in many settlements in Capital and the province. "
In a tall building, in Puerto Madero, an earthquake like the one we had "practically does not feel it, but it suffers from an earthquake in Chile." Why? Earthquakes on the other side of Cordillera arrive at much lower frequencies that affect tall buildings. Distant earthquakes exacerbate tall buildings and nearby earthquakes, low-rise buildings"