What are the precursors of the Quanzhou earthquake?

1. Biological anomalies

Animals have warning signs before earthquakes, so group detection and prevention are very important.

Cattle, sheep, mules and horses will not enter the stables, and pigs will not eat. Dogs will bite them randomly.

Ducks don’t go into the water and make noise on the shore, while chickens fly up the trees and crow loudly.

Snakes come out of their holes in the ice and snow, and rats run away with mice in their mouths.

The rabbit jumped and bumped with its ears raised, and the fish jumped across the water in panic.

The swarms of bees are noisy, and the doves are frightened and cannot return to their nests.

2. Abnormal groundwater

Well water is a treasure and there are precursors to earthquakes.

Without rain, the spring water is muddy, and the sky is dry and the well water is flowing out.

The water level rises and falls greatly, causing bubbles to bloom.

Some change color, and some change taste.

3. Meteorological anomalies

People often describe earthquake forecasting technicians as "managing the sky above, the earth below, and the air in the middle." This does make sense. Before earthquakes, the weather often appears abnormal. The main symptoms include muggy heat before the earthquake, anxiety and irritability, long drought without rain or continuous rain, yellow fog, dark sunlight, strange winds, hail in June, etc. For example: floating clouds are in the shape of extremely long rays in the sky, and the location where the center of the ray points is the location of the central earthquake. Such ray clouds are easily observed by people.

4. Abnormal geoacoustic sounds Abnormal geoacoustic sounds refer to the sounds coming from underground before earthquakes. The sound is as diverse as the sound of cannons and thunder, the movement of heavy vehicles, and the blowing of strong winds. When an earthquake occurs, longitudinal waves radiate from the source and propagate along the ground, causing the air to vibrate and make sounds. Since the velocity of the longitudinal waves is large but weak, people only hear the sound and do not feel the ground is moving. It takes the arrival of the transverse waves to feel movement. . Therefore, there are often records in the epicenter area that "before each earthquake, there is a sound in the ground, like the turbulence of the earth's air, like the swelling of boiling water in a cauldron". If you are in the epicenter, you can often hear the sound of a magnitude 3 earthquake. Ground sounds are the result of changes in the structure and structure of underground rocks and the movement of liquids and gases contained in them. A considerable part of ground sounds are signs of impending earthquakes. Mastering the knowledge of geoacoustics may have better prediction and prevention effects on earthquakes.

5. Abnormal ground light

Abnormal ground light refers to the light coming from underground before the earthquake. Its colors are various, and mixed colors rare in daily life can be seen, such as silver and blue. , white and purple, etc., but mainly red and white; their shapes are also different, including ribbon, spherical, columnar, diffuse, etc. Generally, ground lights appear over a large area, usually within a few hours to a few minutes before an earthquake, and last for a few seconds. Colorful luminous phenomena appeared during and before and after earthquakes in Haicheng, Longling, Tangshan and Songpan in my country. Earth lights often appear simultaneously with natural phenomena such as earthquakes, landslides, landslides, collapses, sand blasts, water spurts, and jets. They often migrate regularly along fault zones or an area, and are synchronized with other macro and micro anomalies. Their causes are always related to Crustal movements are closely related. And controlled by geological conditions and surface and atmospheric conditions, it can cause varying degrees of harm to humans, animals, and plants.

The reports of ground light anomalies we have so far are all from a few seconds to a minute before the earthquake. Such as the Haicheng earthquake, Lancang, Gengma earthquake, etc. have collected similar reports.

6. Geogas anomalies

Geogas anomalies refer to the fog that comes from underground before earthquakes, also known as geomist or ground fog. This kind of fog comes in a variety of colors, including white, black, yellow, and sometimes colorless. It often appears a few days to a few minutes before an earthquake. It is often accompanied by a strange smell, sometimes accompanied by sound or high temperature.

7. Earthquake anomalies

Seismic anomalies refer to the shaking of the ground before an earthquake. It is a well-known phenomenon that the ground vibrates violently during earthquakes. But before an earthquake occurs, sometimes the ground is shaken. This shaking is different from that during an earthquake. It swings very slowly and is often not recorded by seismometers, but many people can feel it. The most significant seismic anomalies occurred before the 7.3-magnitude Haicheng earthquake on February 4, 1975. From late December 1974 to the end of January 1975, they occurred in Dandong, Kuandian, Fengcheng, Shenyang, Xiuyan and other places. 17 earthquakes.

8. Abnormal floor drum

Abnormal floor drum refers to the appearance of bulges on the ground before an earthquake.

About half a year before the 7.9-magnitude Luhuo earthquake in Sichuan on February 6, 1973, a floor drum appeared on a lawn in Tuoba District, Ganzi County. It was shaped like an upside-down iron pot, about 20 centimeters high, and cracks and bulges appeared intermittently around it. It disappears after a few days and repeats many times until an earthquake occurs. Anomalies similar to floor drums include ground cracks and subsidence.

9. Electromagnetic anomalies

Electromagnetic anomalies refer to abnormalities in household appliances such as radios, televisions, fluorescent lamps, etc. before earthquakes. The most common electromagnetic anomaly is the failure of radios. In northern areas, it is also common for fluorescent lamps to self-illuminate before earthquakes. A few days before the 7.8-magnitude earthquake in Tangshan on July 28, 1976, many radios in Tangshan and its neighboring areas failed. The sound was louder and quieter, sometimes non-existent, the frequency modulation was inaccurate, and sometimes there was continuous noise. Also before the Tangshan earthquake, some people in the city saw turned off fluorescent lights first glowing red and then lighting up at night. Some people in Beijing turned off fluorescent lights before going to bed, but the lights were still on.

Electromagnetic anomalies also include abnormal operation of some motor equipment, such as abnormalities in microwave stations, interference in radio plants, and malfunctions of electronic alarm clocks.

However, it should also be noted that the various macroscopic phenomena listed above may be caused by a variety of reasons, and are not necessarily harbingers of earthquakes. For example: the rise and fall of well water and spring water may be related to the amount of rainfall, or may be affected by nearby pumping, drainage and construction. The discoloration and taste of well water may be caused by pollution. Abnormal behavior of animals may be related to weather changes, diseases, and estrus. , external stimulation, etc., you should also be careful not to mistake welding arc light, lightning, etc. for ground light, do not mistake thunder for ground sound, and do not mistake fireworks and flares for underground fireballs.

Currently there are no signs of the above abnormality in Quanzhou area, so there will be no earthquake in the near future. Please work and live with peace of mind!