所さんの目がテン！2025年2月2日 絶妙なバランスで立つ巨石の謎・巨石が巨大地震の研究に役立つ!-
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00:00Megaten
00:04Megaten is about to start!
00:08Megaten! Megaten! Megaten!
00:14A giant stone that is bigger than what you can see.
00:19A giant stone is a very big rock.
00:22Although there is no clear definition,
00:25the giant stone continues to attract people's attention for a long time.
00:33This is a giant stone that stands in an exquisite balance in Okayama Prefecture.
00:40Why did it take on such a mysterious shape?
00:45To solve the mystery of the giant stone,
00:49I am Suzuka Takeishi.
00:52Please leave the stone to me.
00:56Suzuka Takeishi discovered a rare rock called Itame-iwa in the forest of living things.
01:04She visited Suzuka's favorite Suzuka Circuit,
01:08which is said to have originated from Suzuka's name.
01:14Suzuka Mountain, the treasure of giant stones.
01:18Wow!
01:21This is amazing!
01:23What was there was a mysterious giant stone that looked like it was going to fall, but it didn't.
01:28It's really amazing.
01:30In addition, the research of giant stones led to the prediction of a giant earthquake.
01:38Today's Megaten is about the science of the mysterious giant stone.
01:44Giant stone!
01:46It's definitely a mystery.
01:48There are a lot of giant stones, right?
01:50And this time, Takeishi has investigated a number of giant stones, right?
01:54Yes, that's right.
01:55Speaking of stones, Takeishi!
01:58I have come to the mystery of various giant stones in Japan.
02:02I see.
02:04I'm looking forward to it.
02:06First, please take a look at this.
02:07Please take a look.
02:10A giant stone in Akaiwa City, Okayama Prefecture,
02:14is worshipped as the body of a shrine.
02:21Look at this exquisite balance!
02:26A giant stone about 5 meters long is supported by a slight angle,
02:32and it moves back and forth with the power of man.
02:36It looks like an unstable giant stone.
02:39The mystery of the giant stone.
02:41Why is it such an exquisite balance?
02:45Yurugiba is made of a molten rock that was slowly cooled and solidified by magma about 80 million years ago.
02:55The molten rock shrinks when it cools and solidifies,
02:58and a mechanical crack is formed.
03:01This is called Sezuri.
03:06And when rainwater and groundwater seep into the molten rock near the surface,
03:12a storm occurs.
03:16This is how this Yurugiba came to the surface after a long period of time.
03:24So, how can we maintain this exquisite balance?
03:28Let's ask Mr. Takagi from Waseda University, who specializes in geophysics.
03:34When the surface is exposed to the ground and a storm occurs,
03:38the surface gradually becomes rounded.
03:42When the surface is rounded, the area in contact with the ground becomes smaller.
03:48The outside of the surface becomes sand due to the storm,
03:53but the area in contact with the ground becomes heavier.
03:56So, the area in contact with the ground is not eroded.
04:02At this time, when the top of the rock tilts,
04:06the air flows in the open part,
04:09and when it tilts in the opposite direction, the air flows in the opposite direction.
04:15After repeating this for many years,
04:18the center of gravity of the top rock and the area in contact with the ground
04:23were eroded from the outside.
04:26As a result, a rock like a seesaw was created.
04:32It can be thought that the Yurugiba became an exquisite balance stone
04:37because the storm progressed while maintaining the center of gravity.
04:43It became like this with the center of gravity while maintaining the balance.
04:48It's a good thing, isn't it?
04:50Yes, it is.
04:52Isn't it too much to go one way?
04:55Yes, it's natural.
04:57And if you put that much, you want to stab something.
05:01I thought it was dangerous.
05:03In addition, there are other stones called Yurugiwa all over the country.
05:08For example, this is Yurugiwa only in Nishi-iwa, Onomichi City, Hiroshima Prefecture.
05:14In the same way as Yurugiwa in Okayama Prefecture,
05:17it is said that the karst rock that appeared on the ground
05:20became like this due to the storm.
05:23And it is said that the karst rock has the characteristic of being regularly cracked.
05:29This is Wareishi in Tenbayama, Shimane Prefecture.
05:33It became a hot topic because it is similar to the rock that was cut by a sword
05:38in the popular manga, Demon Slayer.
05:43It's amazing. It looks like it was cut by a sword.
05:46Yes, it is said to be very beautiful.
05:48It is said that the karst rock fell from the top of the mountain,
05:52and it was broken by the impact of the impact.
05:56What kind of thing fell and broke?
05:59What kind of thing was there?
06:01I was surprised.
06:03Why is it so beautiful?
06:05It's strange.
06:07Next, we investigated only the material of the karst rock,
06:10which is called the treasure of karst rock.
06:14Takeishi visited Komono-cho, Mie Prefecture.
06:21Good morning.
06:23Good morning.
06:25I'm a presenter, Takeishi Suzuka. Nice to meet you.
06:29We will be guided by local guides, Mr. Uchida and Mr. Sasaki.
06:36I heard that there is a rare karst rock today.
06:41Where is it?
06:43It is the Karst Rock of the Suzuka Mountains.
06:47If you climb this mountain, you can see it.
06:50We are going to climb the mountain.
06:52The Karst Rock of the Suzuka Mountains is 1212 meters high.
07:01The Karst Rock is made of karst rock all over the mountain.
07:05It is a treasure of karst rock that can be found in various geological sites.
07:10For example, this Karst Rock.
07:14It was named because it looks like the Karst King is sitting on a rock.
07:20The Karst Rock is about 10 meters high.
07:24And this karst rock.
07:27It was named because it looks like a creature.
07:31Do you know what it is?
07:35The answer is Takami-Iwa.
07:37Takami-Iwa.
07:39It looks like a camel is resting its wings.
07:44So, we will find out the mystery of the Karst Rock that Mr. Takeishi has in his library.
07:57It is a steep climb.
07:59It is steep at first.
08:03It takes 30 minutes to walk on a steep road.
08:08The first thing we found is...
08:14Wow!
08:17What is this?
08:20It is a karst rock that is about 8 meters high.
08:27It looks like it is being carried.
08:33It looks like it is being carried.
08:35It is called Obare-Iwa.
08:37It means to be carried.
08:44It looks like the left rock is carrying the right rock.
08:51It looks like it is about to fall.
08:54It is strange.
08:56We will find out why the Karst Rock does not fall.
09:00We will find out why the Karst Rock does not fall.
09:04The Obare-Iwa looks like the left rock is supporting the right rock.
09:11The mystery of the Karst Rock.
09:13Why does the Obare-Iwa not fall?
09:18The first point is that the Obare-Iwa has a broken rock called Setsuri.
09:24According to Mr. Takagi, there is a Karst Rock surrounded by Setsuri under the Obare-Iwa.
09:31There is a possibility that the Karst Rock is partially connected by insufficient air flow.
09:39The second point is this small rock on the left side of the Obare-Iwa.
09:46This rock is very important.
09:48This Obare-Iwa is made of a rock called Karst Rock.
09:52If you look closely at the bottom, there is a part where the magma has risen along the crack after the Karst Rock has solidified.
10:01It is likely that the magma has reached the ground.
10:08It is likely that the magma has reached the ground.
10:15It is possible that the Obare-Iwa is supported by the Karst Rock.
10:25In other words, it is possible that the Obare-Iwa is connected to other Karst Rocks in the underground.
10:34And it is supported by a small rock that continues to the underground.
10:39It is possible that the Obare-Iwa is supported by a small rock that continues to the underground.
10:48I was able to solve the mystery of the Karst Rock.
10:55Mr. Takeishi continues to walk in search of the mystery of the Karst Rock.
11:03He climbs a steep road without showing fatigue.
11:06He climbs a steep road without showing fatigue.
11:09He climbs a steep road without showing fatigue.
11:13He climbs a steep road without showing fatigue.
11:19This is a very strange-shaped rock, which is a rare treasure that you can only find when you climb.
11:29It looks like a Jizo, so it is called Jizo-Iwa.
11:36It's a perfect balance.
11:41There is a dice-shaped rock on top of two rocks about 2 meters high.
11:50And...
11:51This is also popular with the examinees.
11:54For the examinees?
11:55It is said that it will never fall.
11:57It will be a treasure.
11:58I see. It will never fall.
12:01It is said that it will never fall.
12:04It is said that it will never fall.
12:08I hope all the examinees who will do their best will pass.
12:14I wish all the examinees all the best for the Jizo-Iwa.
12:21By the way, how did the Jizo-Iwa become like this?
12:27The mystery of the Jizo-Iwa.
12:29Why is the Jizo-Iwa a strange shape?
12:33The Jizo-Iwa is a square-shaped rock because it is made of a cubic rock, which is the same as the Obare-Iwa.
12:46The Jizo-Iwa is a rock that was originally buried in the ground.
12:52The Jizo-Iwa is a rock that was originally buried in the ground.
12:55Then, why is the head of the Jizo-Iwa beautiful?
13:01I think it's because of the earthquake.
13:04The rock at the bottom of the Jizo-Iwa was tilted.
13:09At that time, the rock that was on top of the Jizo-Iwa was twisted and sandwiched between the gaps.
13:18I think that's why the Jizo-Iwa was miraculously sandwiched between the gaps.
13:26The rock on top of the Jizo-Iwa was accidentally sandwiched between the gaps.
13:32However, the rock is likely to collapse at this rate.
13:38According to Dr. Takagi, it is believed that it is supported by the surrounding rocks.
13:45The Jizo-Iwa is a miraculous rock that has a perfect balance due to the occurrence of an accident.
13:56I didn't know that the Jizo-Iwa would be shaped like that by chance.
13:59I think everyone will cry.
14:02By the way, the Jizo-Iwa is also popular as a buy spot.
14:08I also took a picture like this.
14:11How was it?
14:13Are you kidding me?
14:15What are you doing?
14:17It was a lot of fun.
14:19I wanted to take a picture like this.
14:21As Dr. Takeishi found out from his research, the Jizo-Iwa has the history of the Earth engraved on it.
14:27You can see the history of the Earth.
14:30Next, we investigated the Jizo-Iwa, which is also useful for research on earthquakes.
14:37Dr. Takeishi visited the southernmost town of Japan, Kushimoto-cho, Wakayama Prefecture.
14:45Wow, amazing.
14:48There are many Jizo-Iwa on the sea.
14:54Many Jizo-Iwa float in the sea.
14:59The Jizo-Iwa is called Hashigui-Iwa because the Jizo-Iwa is lined up like a bridge.
15:12Kushimoto-cho, where the Hashigui-Iwa is located, is the estimated source of the Great Earthquake in the South China Sea.
15:20The South China Sea is where the Philippine Sea plate sinks under the Eurasian plate.
15:29The Great Earthquake in the South China Sea is expected to occur within 30 years from this year.
15:36Research is being carried out every day to bring it up from 70 to 80 percent.
15:47The Hashigui-Iwa is also related to the research of the South China Sea.
15:54Mr. Hongo of Nanki Kumano Geopark Center told us about the Hashigui-Iwa.
16:02There are a lot of big stones in the back. How many are there?
16:09There are about 40.
16:15The Hashigui-Iwa is almost straight over 850 meters.
16:23You can also observe it up close.
16:28When I look at it again, it's really big.
16:33If it's big, it's more than 10 meters high. It's about the same height as a general three-story building.
16:44How did you make this Hashigui-Iwa?
16:48There was a big volcanic activity around here 15 million years ago.
16:54The magma came out of the underground and the cold solidified.
16:59That's how the Hashigui-Iwa came to be.
17:05The Hashigui-Iwa is made of ryumongan, which is cold and solidified near the surface of the earth.
17:11The magma enters the cracks in the ground created by volcanic activity in the sea.
17:19It cools down and solidifies.
17:23Then the seabed erupts and the surrounding ground is scraped by erosion such as waves.
17:30The Hashigui-Iwa itself was scraped in some places, and it became what it is now.
17:36After this, we will thoroughly investigate the Hashigui-Iwa, which is also useful for the study of massive earthquakes.
17:45The Hashigui-Iwa, which is also related to the study of the Nankai earthquake.
17:51There are more than 1,000 rocks scattered around the Hashigui-Iwa.
17:56There are more than 1,000 rocks scattered around the Hashigui-Iwa.
18:05There are a lot of rocks lying around, but what is this?
18:14This stone is originally the same stone as the Hashigui-Iwa.
18:20What is scattered is the rock separated from the Hashigui-Iwa.
18:26In fact, these rocks are useful for the study of the Nankai earthquake.
18:35It is thought that it was probably carried around by a large wave and scattered.
18:47It's quite a lot of waves to carry such a large rock.
18:52It's quite a lot of waves to carry such a large rock.
18:58It's quite a lot of waves to carry such a large rock.
19:04So this stone is called a tsunami stone.
19:09The heaviest of the tsunami stones is 85 tons.
19:16It is thought that the scattered rocks were carried by tsunamis that occurred several times in the past.
19:25According to recent research, there was a huge unknown tsunami.
19:35What does a huge unknown tsunami mean?
19:41We asked Mr. Shishikura and Mr. Namegaya of the Institute for Industrial and Technical Research.
19:51They started investigating the Hashigui-Iwa in 2006 while studying the Nankai earthquake.
20:00If you look at the location and size of the massive tsunami,
20:06you can see what kind of tsunamis there were in the past and how large they were.
20:12We started investigating because we thought it would be useful for predicting the Nankai earthquake in the future.
20:22We actually went around Hashigui-Iwa and measured the size and location of each of the 1,311 massive tsunamis.
20:38Based on the data, we calculated whether the tsunami would move or not.
20:49We found that the tsunami caused by the Great East Japan Earthquake did not move.
20:59This shows that there was a bigger tsunami than the Great East Japan Earthquake in the past.
21:10The Great East Japan Earthquake was caused by the Nankai earthquake in the Edo period.
21:17The tsunami was estimated to have a magnitude of 8.6 and was the largest tsunami in history.
21:30We calculated whether the tsunami would move or not.
21:38As a result, we found that the tsunami caused by the Great East Japan Earthquake did not move many of the rocks over 10 tons.
21:50However, the rocks over 10 tons were not right under Hashigui-Iwa but scattered far away.
22:01This shows that the tsunami caused by the Great East Japan Earthquake did not move.
22:13It is important to understand the disasters in the past.
22:22The fossils were also useful for the study of earthquakes to protect our lives.
22:33We are studying the past earthquakes and tsunamis.
22:42According to Mr. Sushikura of the Institute of Industrial Technology,
22:47we are going to investigate when the unknown tsunami occurred.
22:52We are investigating whether there are traces of a tsunami like Hashigui-Iwa in the surrounding area.
23:00If we can find out when and how the tsunami occurred,
23:07we will be able to predict when the same tsunami will occur in the future.
23:19How was it this time?
23:22When I stood in front of the fossils, I was overwhelmed by the scale.
23:28In the opening, you said,
23:31It's your first time, isn't it?
23:33It's my first time.
23:35It's just that the name has a rock in it.
23:37I was lucky.
23:39But it's okay.
23:41I was impressed.
23:43What is the next episode?
23:45The next episode is a science village.
23:47Even after the harvest festival, the village is full of blessings.
23:50We held an after-harvest festival for the blessing of winter.
23:53Look forward to it.
23:55It looks fun.
23:56The village is full of blessings.
23:58Look forward to it.
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