Mining on the cause of Wenchuan earthquake
Publish: 2021-04-21 19:00:08
1. The cause of the Wenchuan Earthquake:
the Indian Ocean plate subcted to the Eurasian plate, resulting in the rapid uplift of the Qinghai Tibet Plateau, leading to the earthquake. The material of the plateau flows slowly eastward and compresses eastward along the Longmenshan structural belt on the eastern edge of the plateau. It is blocked by the rigid block under the Sichuan Basin, resulting in the long-term accumulation of tectonic stress energy, which is released suddenly in the Beichuan Yingxiu area of Longmenshan. Thrust, dextral and compressional fault earthquakes
the Sichuan earthquake occurred in the brittle ctile transition zone of the crust, with a focal depth of 10-20 km and a long ration, so it is very destructive
earthquake type:
the Wenchuan earthquake is a thrust, dextral and compressional fault earthquake
focal depth:
the Wenchuan earthquake is a shallow earthquake with a focal depth of 10-20 km, so it is very destructive
scope of influence: including the county within 50 km of the epicenter and the large and medium-sized cities within 200 km. Cheng, Shaanxi, Gansu, Ningxia, Tianjin, Qinghai, Beijing, Shanxi, Shandong, Hebei, Henan, Anhui, Hubei, Hunan, Chongqing, Guizhou, Yunnan, Inner Mongolia, Guangxi, Hainan, Hong Kong, Macao, Tibet, Jiangsu, Jiangxi, Shanghai, Zhejiang, Liaoning, Fujian, Taiwan and many other provinces and cities across the country had obvious earthquake sensation. Except for Heilongjiang, Jilin and Xinjiang, there are earthquakes of different degrees in China. Among them, Shaanxi, Gansu and Sichuan provinces are the most serious. Even Bangkok, the capital of Thailand, Hanoi, the capital of Vietnam, the Philippines, Japan and other places were affected by the earthquake
the Indian Ocean plate subcted to the Eurasian plate, resulting in the rapid uplift of the Qinghai Tibet Plateau, leading to the earthquake. The material of the plateau flows slowly eastward and compresses eastward along the Longmenshan structural belt on the eastern edge of the plateau. It is blocked by the rigid block under the Sichuan Basin, resulting in the long-term accumulation of tectonic stress energy, which is released suddenly in the Beichuan Yingxiu area of Longmenshan. Thrust, dextral and compressional fault earthquakes
the Sichuan earthquake occurred in the brittle ctile transition zone of the crust, with a focal depth of 10-20 km and a long ration, so it is very destructive
earthquake type:
the Wenchuan earthquake is a thrust, dextral and compressional fault earthquake
focal depth:
the Wenchuan earthquake is a shallow earthquake with a focal depth of 10-20 km, so it is very destructive
scope of influence: including the county within 50 km of the epicenter and the large and medium-sized cities within 200 km. Cheng, Shaanxi, Gansu, Ningxia, Tianjin, Qinghai, Beijing, Shanxi, Shandong, Hebei, Henan, Anhui, Hubei, Hunan, Chongqing, Guizhou, Yunnan, Inner Mongolia, Guangxi, Hainan, Hong Kong, Macao, Tibet, Jiangsu, Jiangxi, Shanghai, Zhejiang, Liaoning, Fujian, Taiwan and many other provinces and cities across the country had obvious earthquake sensation. Except for Heilongjiang, Jilin and Xinjiang, there are earthquakes of different degrees in China. Among them, Shaanxi, Gansu and Sichuan provinces are the most serious. Even Bangkok, the capital of Thailand, Hanoi, the capital of Vietnam, the Philippines, Japan and other places were affected by the earthquake
2. At the beginning, the specific mechanism of the earthquake was mainly extrusion, and there may be strike slip energy release towards the end of the earthquake
3. In history, there are more than 10 earthquakes of magnitude 7 or above recorded in Sichuan. So Sichuan itself is on the seismic belt. In fact, earthquakes of magnitude 6 or so often occur throughout the country, but the losses are not as serious as those in Sichuan.
4.
The specific mechanism of the earthquake is mainly extrusion at the beginning, and there may be strike slip energy release towards the end of the earthquake
In general, Wenchuan is located in the North-South seismic belt, a major seismic belt in China< According to experts from China Seismological Bureau, because of the great differences in geological distribution, crustal thickness and crustal movement speed between eastern and Western China, the earthquake occurred in the belt with the biggest difference between eastern and Western China, namely, the North-South seismic belt, which includes Ningxia, Eastern Gansu, Western Sichuan and Yunnan, is an earthquake intensive beltunder this background, Chen Xuezhong studied the earthquake risk in Sichuan area and found that from the historical experience, there was a large earthquake with M = 8 around several years before the strong earthquake with M = 7 or above occurred in Sichuan area. According to this phenomenon, Kunlun Mountain earthquake with M = 8.1 occurred in 2001, This kind of earthquake will happen in Sichuan in a few years
5. According to the results of investigation, monitoring and evaluation, experts from China land and resources airborne geophysical Remote Sensing Center, China Academy of geological environment monitoring, China Academy of Geological Sciences, Institute of geology, Institute of geomechanics, Chinese Academy of Geological Sciences, etc. concted "consultation" on the disaster situation and initially formed three conclusions. First, the Indian plate subcted to the Asian plate, resulting in the rapid uplift of the Tibetan Plateau. The material of the plateau flows slowly eastward and compresses eastward along the Longmenshan structural belt on the eastern edge of the plateau. It is blocked by the rigid block under the Sichuan Basin, resulting in the long-term accumulation of tectonic stress energy, which is released suddenly in the Beichuan Yingxiu area of Longmenshan. Second, thrust, dextral and compressional fault earthquakes. The seismogenic structure is the central fault zone of Longmenshan structural belt. Under the action of compressive stress, it thrusts from southwest to northeast; This earthquake belongs to one-way rupture earthquake, which moved from southwest to northeast, resulting in the aftershock spreading to northeast; After the main shock, the process of stress propagation and release is relatively slow, which may lead to the strong aftershock and longer ration. Third, shallow earthquakes. The Wenchuan earthquake does not belong to the effect of deep plate boundary. It occurred in the brittle ctile transition zone of the crust. The focal depth is 10 km-20 km, so the damage is huge.
6. Earthquake is a form of energy release first
too much energy accumulated in the center of the earth will be distributed in the form of earthquake, volcanic eruption, etc.
moreover, earthquake is caused by plate movement
Sichuan is a basin first, and its terrain is relatively low
it may be that its terrain hinders plate movement, It causes a lot of energy accumulation
when the energy accumulation reaches the critical point, it erupts in the form of earthquake (personal opinion)
the specific reason may need to be studied by professional institutions
but I think the most urgent task for us at present should be to do our part of responsibility under our own ability to give the disaster areas the greatest support
(I don't like the word love, Because it has a form of charity, I use the word responsibility.)
to restore Sichuan to a simple degree of self-sufficiency.
any other reconstruction work should be based on this
too much energy accumulated in the center of the earth will be distributed in the form of earthquake, volcanic eruption, etc.
moreover, earthquake is caused by plate movement
Sichuan is a basin first, and its terrain is relatively low
it may be that its terrain hinders plate movement, It causes a lot of energy accumulation
when the energy accumulation reaches the critical point, it erupts in the form of earthquake (personal opinion)
the specific reason may need to be studied by professional institutions
but I think the most urgent task for us at present should be to do our part of responsibility under our own ability to give the disaster areas the greatest support
(I don't like the word love, Because it has a form of charity, I use the word responsibility.)
to restore Sichuan to a simple degree of self-sufficiency.
any other reconstruction work should be based on this
7. Earthquake Genesis:
Wang Erqi, researcher of Institute of Geology and Geophysics, Chinese Academy of Sciences and expert of Qinghai Tibet Plateau, is familiar with the geological structure of Wenchuan area, and has just been to Wenchuan area in early May. According to his analysis, the Wenchuan earthquake occurred on the southeast edge of the Qinghai Tibet Plateau and the center of Longmen Mountain in Western Sichuan, on the Wenchuan Maowen fault zone. The northward movement of the Indian Ocean plate squeezed the Eurasian plate and caused the uplift of the Tibetan Plateau. While the plateau uplifted, it also moved eastward and squeezed the Sichuan Basin. Sichuan Basin is a relatively stable block. Although the main body of Longmen mountain seems to have weak tectonic activity, it may be in the process of stress accumulation. When the stress accumulates to a certain extent, the crust will rupture and an earthquake will occur. According to the USGS, the epicenter and focal mechanism of the earthquake are consistent with the movement of the Longmenshan fault zone or a related structural fault, and the earthquake is the result of the Northeast movement of a thrust fault. On a continental scale, the seismicity in Central Asia and East Asia is caused by the collision of the Indian Ocean plate with the Eurasian plate. Li Yonggang, a professor at the Southern California Earthquake Research Center in the United States, told Xinhua that the Longmenshan fault zone is an active fault in the earthquake prone area. The material from the deep part of the Qinghai Tibet Plateau flows eastward to the Sichuan Basin, which is blocked and moves upward. The boundary between the two is the fault plane. If the fault moves several centimeters every year, every 50 to 70 meters, the accumulated stress and energy can proce a major earthquake with a magnitude of 7 or more. Because the source is shallow, the focal mechanism is eastward thrusting, and the soil in the earthquake area is soft, the seismic wave can spread eastward for a long distance, which makes people as far as Shanghai and Beijing feel the earthquake. Brian Bapti, director of the seismic monitoring and information service center of the British geological survey, said in a telephone interview with Xinhua news agency that from the perspective of geological structure, the earthquake was related to the Himalayan collision zone, "which is obviously the result of the compression of the Northeast southwest Longmenshan fault zone.". Paul daponier, a geologist at the French Institute of Geophysics, told the media that about 50 million years ago, the Indian Ocean plate drifted northward, collided with the Eurasian plate and then subcted beneath the latter, forming the Qinghai Tibet Plateau. The Qinghai Tibet Plateau is still under the compression of the two plates, which makes the Qinghai Tibet Plateau and its surrounding areas become earthquake intensive zones.
Wang Erqi, researcher of Institute of Geology and Geophysics, Chinese Academy of Sciences and expert of Qinghai Tibet Plateau, is familiar with the geological structure of Wenchuan area, and has just been to Wenchuan area in early May. According to his analysis, the Wenchuan earthquake occurred on the southeast edge of the Qinghai Tibet Plateau and the center of Longmen Mountain in Western Sichuan, on the Wenchuan Maowen fault zone. The northward movement of the Indian Ocean plate squeezed the Eurasian plate and caused the uplift of the Tibetan Plateau. While the plateau uplifted, it also moved eastward and squeezed the Sichuan Basin. Sichuan Basin is a relatively stable block. Although the main body of Longmen mountain seems to have weak tectonic activity, it may be in the process of stress accumulation. When the stress accumulates to a certain extent, the crust will rupture and an earthquake will occur. According to the USGS, the epicenter and focal mechanism of the earthquake are consistent with the movement of the Longmenshan fault zone or a related structural fault, and the earthquake is the result of the Northeast movement of a thrust fault. On a continental scale, the seismicity in Central Asia and East Asia is caused by the collision of the Indian Ocean plate with the Eurasian plate. Li Yonggang, a professor at the Southern California Earthquake Research Center in the United States, told Xinhua that the Longmenshan fault zone is an active fault in the earthquake prone area. The material from the deep part of the Qinghai Tibet Plateau flows eastward to the Sichuan Basin, which is blocked and moves upward. The boundary between the two is the fault plane. If the fault moves several centimeters every year, every 50 to 70 meters, the accumulated stress and energy can proce a major earthquake with a magnitude of 7 or more. Because the source is shallow, the focal mechanism is eastward thrusting, and the soil in the earthquake area is soft, the seismic wave can spread eastward for a long distance, which makes people as far as Shanghai and Beijing feel the earthquake. Brian Bapti, director of the seismic monitoring and information service center of the British geological survey, said in a telephone interview with Xinhua news agency that from the perspective of geological structure, the earthquake was related to the Himalayan collision zone, "which is obviously the result of the compression of the Northeast southwest Longmenshan fault zone.". Paul daponier, a geologist at the French Institute of Geophysics, told the media that about 50 million years ago, the Indian Ocean plate drifted northward, collided with the Eurasian plate and then subcted beneath the latter, forming the Qinghai Tibet Plateau. The Qinghai Tibet Plateau is still under the compression of the two plates, which makes the Qinghai Tibet Plateau and its surrounding areas become earthquake intensive zones.
8. My family name is Zuo Yuanping. I was born in 56. I'm a monkey fault. I can tell from every country in the world that the Wenchuan Earthquake: ① there is a kind of high temperature magma paste like molten iron inside the earth. ② it's because of the magma paste and the earth's rotation in the air, ③ The earth's crust is thin: thick: water: Oil: gas: Metal: Rock: can't stand high temperature magma, the earth rolls again, the weak parts of the crust will be crushed and collapsed, and the magma paste will be ejected out of the surface layer, which will hurt people and animals, As the Earth naturally floats and rolls for a long time, every country and region in the world will be slowly squeezed by high-temperature magma, and then separate plates will be formed after strong explosion. In this way, the sunrise will be divided into East, and the later generations will be divided into East, South, West and North, so as not to lose density. So far, to judge whether an earthquake is coming, the first thing is to see whether there are seismic stratiform clouds at an altitude of 5000 meters, To determine the cloud density, color, magnitude and size, within a few days, then monitor and measure the crystal frequency of the underwater power supply: use your eyes to observe whether there are abnormal muddy water bubbles in the frequency 72 hours day and night, 12 hours, and 6. It is really abnormal (this is the dead angle that can not be measured by the instrument): This is also the precursor of the earthquake (time 30 minutes): when this time comes, an earthquake will occur. In the past 14 years, Zuo Yuanping's summary of unclassified and conservative scientific data is of great practical value to people.
9. It can be divided into natural causes and man-made causes
natural causes: intense plate activity zone
rock layer fracture
forming earthquake
volcanic eruption can also ince earthquake
man-made causes: building water retaining dam (dam of water conservancy project) can also ince earthquake - but this kind of situation is rare!
natural causes: intense plate activity zone
rock layer fracture
forming earthquake
volcanic eruption can also ince earthquake
man-made causes: building water retaining dam (dam of water conservancy project) can also ince earthquake - but this kind of situation is rare!
10. It is not caused by the Three Gorges project, but by natural causes< First, the Indian plate subcted to the Asian plate, resulting in the rapid uplift of the Tibetan Plateau. The material of the plateau flows slowly eastward and compresses eastward along the Longmenshan structural belt on the eastern edge of the plateau. It is blocked by the rigid block under the Sichuan Basin, resulting in the long-term accumulation of tectonic stress energy, which is released suddenly in the Beichuan Yingxiu area of Longmenshan< The second is thrust, dextral and compressional fault earthquakes. The seismogenic structure is the central fault zone of Longmenshan structural belt. Under the action of compressive stress, it thrusts from southwest to northeast; This earthquake belongs to one-way rupture earthquake, which moved from southwest to northeast, resulting in the aftershock spreading to northeast; After the main shock, the process of stress propagation and release is relatively slow, which may lead to the strong aftershock and longer ration< The third is shallow earthquake. The Wenchuan earthquake does not belong to the effect of deep plate boundary. It occurred in the brittle ctile transition zone of the crust. The focal depth is 10 km-20 km, so the damage is huge.
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