What are the signs before natural disasters?

1. Before the earthquake, in addition to the so-called "earthquake clouds", there were many manifestations in the sky, such as groundwater anomalies, biological anomalies, climate anomalies, etc., which gave human beings "early warning" in various forms.

Small earthquakes report big earthquakes. For example, before the Tangshan earthquake, there were several small earthquakes, but none of them attracted people's attention.

Groundwater anomaly. For example, the water level of well water suddenly rises or falls, and the water suddenly becomes bitter or sweet, discolored, turbid or clear, and even turns over and bubbles.

2. If the waves on the beach start to bubble, make a "squeaky" sound and start to recede quickly, then it is these three kinds of nature that send out tsunami signals.

Extended data:

Post-disaster prevention should specifically do the following:

Dead livestock and poultry

There are a large number of pathogenic microorganisms in dead livestock and poultry, which must be treated harmlessly. The simplest and most effective treatment method is to bury the dead livestock and poultry deeply, and choose highland areas with a pit depth of more than 2 meters.

After the corpse into the pit, sprinkle lime or disinfectant and cover it with thick soil. It can also be burned where conditions permit. It is forbidden to sell slaughtered and dead animals to ensure that there is no major epidemic after the disaster.

Post-disaster disinfection

After the disaster, it is necessary to thoroughly disinfect the breeding environment and livestock and poultry pens within the jurisdiction to avoid direct contact between pathogens and livestock and poultry groups and reduce the risk of animal diseases.

Among them, the key places for disinfection are livestock houses, slaughterhouses (points), processing and sales places of livestock and poultry and their products, warehouses, transit places, livestock trading markets, farmers' markets, drinking water sources, livestock transport vehicles, etc. Besides cleaning, washing and wiping, there are also physical disinfection, biological disinfection and chemical disinfection, such as sun exposure, incineration and pile fermentation. Chemical disinfection is the most widely used method.

Immune work

Must do a good job in livestock and poultry immunization. After the disaster, it is especially necessary to strengthen the immunization of streptococcus suis and rabies. For the immunized livestock and poultry, supplementary immunization can be carried out according to the epidemic investigation. In places where anthrax may be prevalent, cattle and sheep should be injected with non-toxic anthrax spores.

Livestock and poultry that have not been immunized against classical swine fever and Newcastle disease should be replenished immediately. For other infectious diseases of livestock and poultry, vaccination should also be done according to the epidemic situation. For large-scale farms, samples should be collected in time for immune antibody monitoring, and livestock and poultry groups whose antibodies are not up to standard should be supplemented in time to avoid the occurrence of epidemic situation.

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