dry weather

2. Gas comes out of the crater or the gas comes out faster than before;

3, the crater and the surrounding can smell irritating smell, usually the smell of sulfur and hydrogen sulfide.

4. Abnormal changes of surrounding electromagnetic waves;

The water temperature around the volcano will be much higher than usual.

6, small animals (such as pigs, dogs, cats, poultry, etc. ) will be irritable.

7. Where there is water in volcanoes and their ancillary facilities, such as ponds, the water will become sour, hot and corrosive;

8. There will be a small earthquake in the crater.