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■ Progress: presenter Jaeyoon Lee, presenter Seungmin Lee
■ Cast: Won-cheol Cho, Professor Emeritus, Department of Civil Engineering, Yonsei University
* The text below may differ from the actual content of the stream, so please check the stream for more accurate information.
◇ Anchor> But now, the Japan Meteorological Agency is analyzing that this earthquake is the aftershock of the Great East Japan Earthquake of 2011. Could this be an aftershock over such a long period of time?
◆ Cho Won-cheol> It can last a long time. Because what happened in 2011 was so great. At that time, what really happened with a bump was a bump and a weak ringing after a long time, but I hope this ends, but it is said that another aftershock, large and small, can continue for a week or more for a month . or more …
◇ Anchor> We briefly summarize the situation of the Great East Japan Earthquake through the screen. The scale was 9.0 at the time. More than 15,000 people died and 2,500 disappeared.
The regions where the Great East Japan Earthquake and the earthquake occurred are similar. There doesn’t seem to be a big difference in distance. The scale was 7.3 this time and 9.0 10 years ago. I think 7.3 is not small. How about compared to 9.0?
◆ Cho Won-cheol> It is an energy difference of 100 times. Didn’t 2 go up from 7 to 9? Then the energy comes out in squares like this: 100 times, 10, 100, 1000.
◇ Anchor> Right. The Great East Japan Earthquake itself is so strong that the intensity of the earthquake is incomparable to the earthquake that occurred two days ago.
◆ Won-cheol Cho> It’s big. Much larger. But the biggest difference is whether there is a continuing tsunami or not, but luckily there was no tsunami this time. What was observed now was about 20 cm, but there was no significant damage with it.
◇ Anchor> So why wasn’t there a tsunami this time?
◆ Won-Chul Cho> That is all that people who specialize in earthquake relief will investigate and reveal in the future. Tsunamis may or may not occur depending on the type of earthquake that occurs, depending on how such an earthquake occurs.
Recently, a glacier collapsed in the Himalayas, entering a river and entering a dam, and that is also a type of tsunami. So we have divided tsunami outbreaks into six categories, but this time, fortunately, the tsunami did not follow.
◇ Anchor> So, shouldn’t it be considered that there is no possibility of this tsunami happening again?
◆ Cho Won-cheol> No. However, if another aftershock occurs at a certain depth or at a shallow depth, tsunamis may occur.
◇ Anchor> It is said that a tsunami may or may not occur depending on the type of earthquake. What we usually say is that there is a direct type underwater earthquake, and there is only a general underwater earthquake.
◆ Won-cheol Cho> The direct type is because one side goes down and one side goes up when the crust crosses up and down. As it rises, the difference in sea level changes rapidly in a short period of time.
◇ Anchor> When will a tsunami come?
◆ Cho Won-cheol> That’s when a tsunami happens. Or, when the crust enters and one side rises, a tsunami can occur if the sea level is different.
[저작권자(c) YTN & YTN plus 무단전재 및 재배포 금지]