How to set earthquake warning for mobile phones

Mobile phones (such as k50 in Redmi) have the following ways to set earthquake warning:

Operating environment: Redmi k50, miui 10, setup.

1. First, open the phone settings, find "Security" in the phone settings and click.

2. Click "SOS Emergency Contact" in the security interface, and then click "Natural Disaster Warning".

3. Click the button on the right side of "Earthquake Warning" and choose to agree to ring the bell.

Earthquake precursor phenomena are:

1, water anomalies: anomalies include turbidity, bubbling, flowering, temperature rise, discoloration, off-flavor, sudden rise, sudden drop, sudden exhaustion or gushing of springs, etc.

2. Biological abnormality: The physical and chemical changes accompanying the earthquake can stimulate some sensory organs of some animals and cause abnormal reactions.

3. Meteorological anomalies: Before the earthquake, meteorological anomalies often occurred. There are mainly sultry before the earthquake, anxiety and irritability, long drought or continuous rain, yellow fog scattered, dark sunshine, strange wind raging, hail (flying snow) in June and so on.

4. Ground-air anomaly: fog from underground before the earthquake, also known as ground fog or ground fog. It often appears within a few days to a few minutes before an earthquake, often accompanied by strange smell, sometimes accompanied by noise or high temperature. Abnormal ground motion: the ground shaking before the earthquake is scientifically called foreshock.