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▲nan'en waterfall in ailao mountain scenic area. according to visual china

recently, the video of the blogger "shantei painting materials" making two solo trips to ailao mountain to collect materials continues to attract attention. many netizens marveled at the thrills presented in the picture, and some said "it felt like watching an adventure horror movie."

on october 5, "there is an abnormality in the intensity of the earth's magnetic field in ailao mountain" became a hot search on weibo. a reporter from red star news noticed that the self-media account "teacher tan geography studio" published an article titled "what is ailao mountain?" the article "why is ailao mountain a "forbidden zone"" was quoted by many media and became extremely popular.

the operator of "teacher tan geography studio" said in an interview with a red star news reporter on the 5th that he is a middle school geography teacher. although the content related to ailao mountain was posted under his account, the original text was not written by him. , related content is also uploaded online.

tang xiaochun, a professor and doctoral supervisor at the school of geography and tourism of guangdong university of finance and economics, told red star news that geomagnetic anomalies do exist in some places. this is mainly caused by strata or rocks with magnetic minerals exposed in this area. it is actually relatively common. things.

tang xiaochun introduced that the most common rock with magnetic minerals is basalt, which is a basic rock. specifically, in the ailao mountain area, there should be large areas of exposed basalt. compass failure may occur in some areas with strong geomagnetism, but now the compass is not the only way to determine the direction.

popular author:

"abnormal magnetic field strength" comes from online content

the main purpose of this post is to remind everyone to respect nature.

in recent days, attention on ailao mountain has continued to increase on the internet. among them, the topic "alao mountain has anomalies in the strength of the earth's magnetic field" has become a hot search topic on weibo.

after the red star news reporter inquired, he found that an article from the self-media account "tan teacher geography studio" "what is ailao mountain?" why is ailao mountain a "forbidden zone"?" became extremely popular after being cited by many media.

▲screenshots of related articles (part)

the article stated that "ailao mountain has been measured to have anomalies in the strength of the earth's magnetic field, which has caused the compass to malfunction and increased the risk of getting lost." in this regard, some netizens commented that it is no wonder that ailao mountain is so mysterious. it turns out that it is because of a different "magnetic field." but some netizens suspect that this statement is a kind of hype.

on october 5, a reporter from red star news contacted the operator of "teacher tan geography studio", who stated that he was a member of the chinese geographical society and a middle school geography teacher. he usually publishes some knowledge articles about geography.

the operator told the red star news reporter that the statement in the aforementioned article that "there is an abnormality in the strength of the earth's magnetic field after measurement in ailao mountain" was not written by him (originally), and most of it was content uploaded online; he wrote this article the purpose is mainly to remind everyone not to venture into undeveloped forests rashly.

the operator said that as far as he knew, there was no clear evidence that there was a magnetic field problem in ailao mountain. even if the earth's magnetic field anomalies had an impact on the compass, satellite positioning and other technologies were more relied on in the wild, and the impact was minimal. “the main thing is to remind everyone to respect nature and life.”

rescuers for the missing:

at first, it was suspected that magnetic field interference caused the confusion.

the investigation found that there was no obvious geomagnetic anomaly

three years ago in november, four geological investigators lost contact after entering ailao mountain. when they were later found by the search and rescue team, all four had no vital signs and unfortunately died in the line of duty. hu wenkun, president of the yunnan mountaineering outdoor sports association, participated in the rescue at that time.

shortly after the search and rescue, hu wenkun was interviewed by a red star news reporter. at that time, he had suspected that the disappearance of several geological team members was mainly due to the interference of the local magnetic field and caused them to get lost; the victims themselves did not realize the danger, and a hypothermia accident occurred.

however, when interviewed by a red star news reporter again on october 5, hu wenkun said that his judgment at that time was not accurate. he told reporters that after the incident, several local geological prospecting institutes in yunnan had conducted surveys and reviews, "and found that there was no obvious evidence that there were obvious abnormalities in the geomagnetic field of ailao mountain. the main reason for the death of the geological team members was physical loss." temperature".

▲on november 21, 2021, search and rescue personnel were marching in ailao mountain. source: yunnan zhenyuan county party committee propaganda department

according to xinhua news agency on december 15, 2021, the public security organs conducted forensic examinations on the four geological investigators who died in the line of duty in ailao mountain. it was found that the four people died of cardiogenic shock caused by hypothermia, and poisoning and mechanical injury were ruled out. . according to a joint on-site investigation by experts in the fields of public security, geology, meteorology, environment, communications, forestry, mountain rescue and other fields, it is believed that the main cause of the death of the four people was excessive physical exertion caused by long-term mountain climbing, instantaneous strong winds, and sudden drops in temperature in the area where the incident occurred. causes hypothermia in the human body.

red star news reporters noted that the above reports showed that from the results of the joint on-site investigation, the incident area was extremely humid, the temperature changed rapidly, and the microclimate characteristics were obvious. it was extremely prone to severe weather such as local heavy rains, instantaneous winds, and sudden drops in temperature, leading to primitive the forest has been filled with heavy fog for a long time and the visibility is extremely low, making it difficult to determine the direction. the report did not mention other factors such as the geomagnetic field.

in an interview on the 5th, hu wenkun said that based on his own actual experience, there is no problem in determining the direction when using a compass in ailao mountain. when traveling in the mountains, most people now use satellite navigation and other facilities. sometimes the signal is not good, but there is no wrong direction.

however, hu wenkun reminded that people without field experience should never enter undeveloped mountainous areas, “because there are too many dangerous factors in these places, such as wild beasts, sudden weather changes, complex terrain, etc. the main cause of casualties in mountains and forests like laoshan.”

▲jinshan primeval forest park located in ailao mountain scenic area. photo by red star news reporter li yida

geological expert:

"geomagnetic anomalies" are caused by magnetic mineral rocks

relatively common, not much "mysterious"

red star news reporter noticed that after the blogger posted the video of entering ailao mountain, many netizens believed that he was "targeted by vicious beasts." to this end, the blogger also responded, "don't guess, it's all tree roots." ", "it's just a record of the work of finding raw materials. the editing has a web feel and there are not so many mysterious things." however, the "mystery" of ailao mountain is still hotly discussed, and many tourists travel directly to ailao mountain.

red star news reporters previously visited the ailao mountain scenic area and learned that in fact, some areas of ailao mountain have been developed into scenic spots, with relatively complete supporting facilities and services, and many tourists come here. as long as they do not enter undeveloped areas, in virgin forest areas, there are almost no risks.

at the same time, "the abnormality of the geomagnetic field intensity in ailao mountain" has also been hotly discussed. in this regard, tang xiaochun, a professor and doctoral supervisor at the school of geography and tourism of guangdong university of finance and economics, said in an interview with a red star news reporter on the 5th that there are indeed geomagnetic anomalies in some places. this is mainly due to the magnetic minerals exposed in this area. it is caused by strata or rocks, but this is a relatively common situation and does not have much "mystery".

▲photographed by red star news reporter li yida of jinshan primeval forest park

tang xiaochun explained that the most magnetic rock type is igneous rock. igneous rock is formed by the cooling and solidification of magma. it contains a large amount of ferromagnetic minerals, such as magnetite. these minerals give igneous rock extremely strong magnetism. the most common rock with magnetic minerals is basalt, which is a basic rock. basalt is a type of igneous rock. there should be large areas of exposed basalt in the ailao mountain area, so it is normal to have geomagnetic anomalies.

tang xiaochun said that the abnormal strength of the earth's magnetic field in a place depends on the amount of magnetic minerals contained in the rocks, that is, the strength of the formation's magnetism. in places with strong magnetism, ordinary compasses will be significantly affected, and in severe cases, the compass will completely fail.

"if you only rely on the compass to identify the direction at this time, you will get lost. but in fact, when people go to the wild now, there are many ways to identify the direction, especially the application of satellite navigation." tang xiaochun said, but even so, for those who for those who have no outdoor experience, it is better not to go to undeveloped mountainous areas easily, especially mountainous areas with dense vegetation.

red star news reporter fu yao and intern you liqin