Everyone should be familiar with earthquakes, but sometimes it seems that earthquakes happen at night. Why do earthquakes happen at night? Can't we give advance notice of an earthquake? Follow Xiao Bian to have a look.
Why are earthquakes always at night The harm of earthquakes is not only sudden, but also mostly at night, even in the middle of the night when people fall asleep suddenly. For example:
On April 12, 1906, the San Francisco 8.3 earthquake occurred at 5:12 in the morning;
On May 22, 1906, the largest 8.9 magnitude earthquake in the 20th century occurred in Chile at 19:11 after sunset;
On July 28, 1976, China's Tangshan 7.8 magnitude earthquake occurred at 3:42 a.m;
On January 17, 1995, the Kobe earthquake occurred at 5:46 in the morning;
According to statistics, there were 25 earthquakes with magnitude above 5 in China in 1985, 20 of which occurred between 19:00 after sunset and 6:00 the next morning, accounting for 80% of the total.
As we all know, the gravity of the moon can cause ocean tides. This change is not limited to sea water. Tides can also occur in the solid crust, but it is difficult for us to find it. With precise instrument measurement, it can be found that under the gravity of the moon, the solid crust can also have a tidal amplitude of about 0.5 meters. Although an earthquake is a reflection of the movement of the earth's interior, sometimes when it is ready but not launched, the earth tide generated by the moon's gravity will play a role in triggering the earthquake energy that has been stored for a long time.
Earthquakes occur not only at night, but also at the time when the first and fifteenth months of the lunar calendar are the new moon. This is also because the gravitational tide of the moon will reach a large value before and after the synoptic observation. For example, the Kobe earthquake in Japan in 1995 was on the 17th day of the lunar calendar, the Indian earthquake on September 30, 1993 was on the 15th day of the eighth lunar month during the Mid Autumn Festival, and the Tangshan earthquake on July 28, 1976 was on the second day of the seventh lunar month. At 1:57 a.m. on February 10, 1990, the Taicang earthquake with a magnitude of 5.1 occurred on the 15th day of the first lunar month, the Lantern Festival.
Why didn't we give advance notice of earthquake In fact, the biggest reason is that the movement of the crust is too complex and there is no law to follow, which is different from weather forecast, which can be predicted through satellite cloud images and the change law of the atmosphere.
In places where earthquakes often occur, the crustal movement is quite frequent. There is no definite way to determine which crustal movement is the source of earthquakes according to the current scientific and technological level.
In order to solve this technical problem, scientists have actually conducted simulation experiments long ago. Scientists input the complete data of the whole movement of the crust into the artificial intelligence computing machine, conduct calculation and analysis through algorithm learning, and then obtain the change data of the released energy of the crust and fault state.
Through a lot of training, such artificial intelligence calculation has been able to accurately predict the information of the upcoming earthquake from the information of multiple crustal movements.
After all, this kind of simulation experiment can not be applied to reality, and earthquakes in reality can not be simulated. So in reality, scientists open their minds and use instruments to detect earthquakes, that is, slow earthquakes.
As the name implies, slow earthquakes are caused by the slow sliding between crustal faults, which leads to the slow release of energy, and the process becomes very long, which takes weeks for short and months for long.
In this long process, scientists have enough time to detect the data, and then calculate through the AI computer. The results show that AI can really calculate the interaction time of the next fault.
This kind of slow earthquake is a special case because of its particularity. In fact, the conventional earthquake time period is very harmful, and the situation of each earthquake is different, so it is impossible to collect enough data for analysis. Therefore, it needs a lot of effort and energy to break through this technology.
Chifeng, Inner Mongolia, has a 4.7 magnitude earthquake At 5:10 on October 15, 2021, an earthquake of about 4.7 magnitude occurred in Arhorqin Banner, Chifeng City, Inner Mongolia (44.17 degrees north latitude, 120.29 degrees east longitude). The final result is subject to the official quick report.
Why to hide from toilets and kitchens in earthquakes 1、 The kitchen or toilet is mostly the main frame pillar of the building
2、 Small space, not easy to collapse
3、 There are fewer things. Reduce injuries
4、 There is water
