Many volcanoes are in areas with favorable climate, and the soils fertilized by volcanic ash are especially fertile. And people continue to lodge near volcanoes, despite potential danger which those bear. Therefore it is vital to be able to predict volcanic eruptions.
Instruction
1. Scientists defined that activity of volcanoes directly depend on activity of the Sun and submits to an eleven-year cycle.
2. To predict a volcanic eruption, it is necessary to conduct constant observation of its state. Manifestation of volcanic activity are thermal sources and fumarola – volcanic gases. It is established that before eruption the water temperature in hot springs and fumarol increases. Can change and the composition of volcanic gases and water – increases concentration of compounds of sulfur. The soil also heats up – it is visible on thawing of glaciers and drying of streams and wells.
3. The method of infrared shooting from the satellite is based on temperature change of the soil. Analyzing the pictures made at different times it is possible to judge a possibility of eruption.
4. Magnetic anomalies around a volcano can be sign of the future disaster – shooters of compasses deviate true value. Also the intensity of magnetic field increases. It is connected with the fact that the melted magma approaches closer the Earth's surface.
5. Also before eruption there are small earthquakes, the level of the soil rises. Sometimes the mountain grows by several dozen meters. It is often possible to hear the roar proceeding from the depths of a volcano and to see the increasing amount of smoke. In Japan even removed the formula which is rather precisely counting the probability of a volcanic eruption of Assam. It depends on quantity of earthquakes and the smoke emitted from a volcano in a month.
6. Also animals can help people with the forecast. Cats, dogs, Amphibia, reptiles very much meteochuvstvitelna. Most likely, their health is affected by fluctuations of earth crust and the increasing force of magnetic field. Shortly before accident their behavior becomes uneasy, and they try to leave the dangerous place. Perhaps, some people have such abilities too, but are not inclined to attach it significance.