the night before yesterday, there was an earthquake in Jiuzhaigou, Sichuan Province. All kinds of news about the earthquake cloud came from the wechat circle for a while. Is there any relationship between the earthquake cloud and the earthquake? What is the cause of the formation of the earthquake cloud? What kind of cloud is the earthquake cloud?
Is there a scientific basis for earthquake clouds? No
Earthquake cloud is a kind of cloud body which indicates earthquake in non meteorology. There is not a common point of view in the international research. The academic community has an untrustworthy and pseudoscientific attitude towards the earthquake cloud. There is no earthquake cloud, and no cloud can predict earthquakes.
There is no accurate prediction method for earthquake cloud. The "earthquake cloud" can only be used as a reference for macro anomalies, not as a basis for earthquake prediction. For earthquake, we must rely on the micro monitoring of professional instruments.
Experts believe that abnormal phenomena such as streaks, ribs, radiation and scales in the sky can not be used as a basis for earthquake prediction. At present, there is no theoretical evidence that the crustal movement is related to the short-term meteorological changes.
The official microblog of Jiangning branch of Nanjing Public Security Bureau '@ Jiangning Public Security Online' released this morning pointed out that the so-called "earthquake cloud" has never been confirmed and recognized by the scientific community, and those so-called earthquake prediction are undisguised rumors. The reason why these rumors can bewitch people is also very simple: Send a "suspected earthquake cloud" and "earthquake prediction" post every three to five times, which is deleted quietly and several hundred times a year. This time, the Mongolian said he was the most intelligent.
In addition, according to media reports: 'Sichuan Province, including Wenchuan County, has launched earthquake early warning system in many places, which will be carried out ten seconds before the earthquake. '
The warning mentioned here is not prediction. Early warning refers to that when an earthquake occurs in a certain place, the P-wave will arrive at the surface first, and the extremely damaging S-wave will arrive in seconds to tens of seconds. When the seismic monitoring instrument catches the P-wave, it can immediately send out an early warning through the mass communication channels such as TV station, so that people can use the time difference between the arrival of P-wave and S-wave to avoid danger and save themselves.
The formation principle of earthquake cloud heat theory
When an earthquake is about to occur, a large amount of heat will be generated due to the accumulation of geothermal energy in the seismic zone or the intense friction of rocks in the seismic zone caused by strong gravity. These heat will overflow from the surface of the ground, causing the air to increase temperature and generate updraft. This gas will flow in the upper air to form 'earthquake cloud', and the head of the cloud will point to the place where the earthquake occurred.
Electromagnetic theory
Before the earthquake, the rock appears' piezomagnetic effect 'under the action of geostress, which causes the local change of geomagnetic field; the geostress causes the rock to be compressed or stretched, which causes the change of electrical resistivity and the corresponding local change of electromagnetic field. Due to the influence of electromagnetic wave on the upper ionosphere, the plasma concentration in the ionosphere is sharply reduced, which makes the water vapor and dust arranged in an orderly and non free way to form the earthquake cloud.
Nuclear radiation theory
We know that the early nuclear physicists used cloud chamber to detect nuclear radiation, used pure vapor to expand adiabatically, and the temperature was reduced to the supersaturated state. At this time, charged particles were injected, and ions were generated in the path. Supersaturated gas condensed into small droplets with ions as the core, so as to show the tracks of particles, which can be photographed.
The earth's atmosphere, in fact, can be seen as a simple cloud chamber. When radiation is generated inside the earth, a large number of ions with strong penetration enter the atmosphere through the crust. Under suitable conditions, water droplets condense into clouds along the radiation trajectory, which is the so-called 'earthquake cloud'.
This pseudonym is called "the nuclear explosion hypothesis of earthquake".