Was there any abnormal phenomenon before the great earthquake in history?

Before the great earthquake in history, there will be some anomalies. For example, before the earthquake, many animals will behave strangely, and may suddenly start to panic, run around, can't stop, and may even scream, making people think that a thief has come in. Some animals even fly around and never fall on trees. The groundwater we drink may also be abnormal. The groundwater we saw before may be particularly clear without any turbidity. However, before the earthquake, after the groundwater is pumped out, it may suddenly become turbid, and sometimes it even has an unspeakable taste, which makes people unable to drink; Besides, when the earthquake comes, the weather will be capricious. It may be sunny at first, but suddenly it may turn cloudy, accompanied by strong winds and heavy rain. This is a particularly common phenomenon.

We must be vigilant about earthquakes. As a geological disaster, earthquake is extremely destructive. Every earthquake will bring indelible damage to human beings and the environment and endanger human survival. Therefore, we must learn some basic earthquake knowledge to protect ourselves.

First, before the earthquake, we will feel abnormal cell phone signals.

The earthquake began to react from underground. When an earthquake occurs, its crustal movement can directly affect our electromagnetic stability, and some of our electromagnetic equipment may be in a stopped state. Not only that, but also, it can make our cell phone signal suddenly become extremely low, and sometimes even the direct cell phone has no signal. Therefore, when you suddenly find that your mobile phone has no signal, you feel that something is wrong, and you should take immediate action to protect yourself.

Second, before the earthquake, it will lead to abnormal animal behavior.

This is the most direct embodiment. Almost every time an earthquake comes, animals will behave abnormally and run around screaming.