What are the abnormal conditions before a major earthquake?

Jiuzhaigou, Sichuan suffered a 7.0-magnitude earthquake. What special circumstances will there be before the earthquake occurs?

Let me briefly talk about two points here.

1. Groundwater anomalies

Before a major earthquake, the water levels in wells and springs would rise and fall, turn, swirl, bubble, turn sand, float oil, become muddy, Discoloration, odor change, temperature rise, water spray and other phenomena.

Seismic workers and the people summarized life and vividly reflected the song of the changes in groundwater before the earthquake:

Well water is a treasure, and the precursors come early. There is no rain and the water in the spring is muddy, and the well water comes out early in the day.

The water level rises and falls sharply, causing bubbles to bloom. Some change color, some change taste.

The sky will change and rain will come, and the water will change and the ground will make trouble. Establish a macro network and report extremely quickly.

For example: The day before the Jingtai earthquake in October 1990, the water level in a well in Shangba Village, Zhenglu Township, Jingtai County dropped, and the original rope could not be used to draw water. As a result, an earthquake occurred the next day There was a 6.2 magnitude earthquake.

2. Animal abnormalities

1. Cave-dwelling animals. For example, the abnormal behaviors of rats and snakes before earthquakes include: coming out of their holes in large numbers during hibernation; abnormal activity patterns, moving in groups, and moving with their children; screaming, panicking, being stupid and not afraid of people, and being irritable, etc.

2. Aquatic animals. For example, abnormal behaviors of fish and frogs in rivers, reservoirs, and ponds before earthquakes are common: floating on the water, tumbling, spinning, comatose, and sudden changes in activity patterns, etc.

3. Ground animals. For example, the abnormal behaviors of horses, cows, pigs, dogs, cats, etc. before the earthquake are: not entering the pen, making trouble in the pen, jumping over the fence and running away, not listening to the owner's orders, unusual barking, panic, or sluggishness , lying on the ground and waiting.

4. Flying animals. For example, the abnormal behaviors of chickens, ducks, geese, pigeons, birds and insects before the earthquake include: unconventional flying, screaming, not entering the nest, not returning to the nest, or flying around in the cage, changing The way of perching may be dull and lifeless.

The vast number of people in our country wrote a vivid song based on the abnormal reactions of animals before earthquakes:

There are signs of animals before earthquakes, and it is important to conduct mass testing and prevention.

Cattle, sheep, mules and horses are not allowed to enter the pen, and pigs are not allowed to eat. Dogs bite them indiscriminately.

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 big cats run away with kittens 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.

Every household observes and makes forecasts based on anomalies.

For example: The day before the 6.2-magnitude earthquake in Jingtai County on October 20, 1990, dogs in Xiaxiang Village, Jingtai County, ran into the mountains in groups, barking at the sky. The mules and horses did not enter the pen for a day or two before the earthquake. One or two hours before the earthquake, while fighting in the field, the horse pulling the cart screamed and ran away. However, this useful information was not reported to the relevant departments in time, and it was not reported to the earthquake department in time, so a good opportunity to predict an imminent earthquake was lost.