The process of volcanic activity often causes many small or
strong earthquakes. Earthquakes also often lead to volcanic
activity. Of the 27 volcanic activities recorded in 1999, 14
occurred in just over two months after Turkish earthquake.
The fundamental reason of volcanoes and earthquakes is the
rupture of rocks caused by material movement in the earth's
interior; astronomical factors such as the tide-generating
force of the sun and moon also induce earthquakes, but the
fundamental power is still the accumulation of energy in the
earth's interior. Volcanic activities and earthquakes are twin
brothers, during the period of frequent earthquakes from August
to October 1999, volcanic activities also increased sharply, with
a total of 17 volcanic eruptions occurring around the world.
Before volcanoes erupt, magma accumulates in large quantities
underground and approaches the surface. At this time, some of the
gases and water vapors in the magma are first released, among
these odors, there are sulfur vapors and many sulfur-containing gases,
so people can usually smell unpleasant odors.
Sulfur and silver combine to produce black silver sulfide, so before
a volcano erupts, the surface of silver will turn black.
Similar to earthquakes, some animals show signs of restlessness. Approach
the moment of the explosion, more gas and water vapor came out and looked
like smoke. Some of these gases are poisonous, at the same time, the magma
temperature is very high, when it accumulates underground, it raises the
temperature of the topsoil above, these gases will make the sensitive animals
flee after detection, and the animals with weak resistance will die from
Although human sensory organs are not as sensitive as some animals, people
can use precision instruments to observe and obtain information. For example,
a special thermometer is placed underground to measure changes in land temperature;
air samples can often be taken to analyze their composition; we can also use an
instrument that is sensitive to detect the changes of gravity, to gather information
about whether magma accumulates in large quantities underground, if magma underground
increases, gravity increases there; sounds often emitted underground before volcanic
eruptions can also be detected by scientific instruments.
It's a new way for scientists in New Zealand to predict volcanic
disasters recently. In September 2001, Some New Zealand scientists
announced that they had discovered a new way to predict volcanic
disasters, that is, using sound waves from the earth's inner core to
analyze the direction of the formation of crustal fissures and to
predict the exact time of volcanic eruptions. These New Zealand scientists
collected a lot of scientific data from the recent two large-scale eruptions
of Mount Ruapehu in New Zealand, they found that before and after the
eruption of the volcano, the sound waves in the earth's core showed regular
changes, which were formed by the fracture of the rock layer below the
surface. Cracks usually occur in the crust before a volcanic eruption, so
that as long as people closely observe the direction of those cracks,
they can predict the exact time of volcanic disasters in advance. However,
scientists also point out that until more information is collected, the
new method of predicting volcanic disasters can only be part of various
Before the eruption of volcanoes, underground magma was active, producing
earth stress, which changed the ground fluctuation.
Ice and snow melting on volcanoes
Many tall volcanoes are perennially above the snow line, before the
eruption, due to magmatic activity and rising ground temperature, melting
ice and snow on the volcano predicted an eruption.
The volcano rumbled
The sound of magma and gas expanding before it bursts out of the
crater indicates that an eruption is imminent.
Monitoring of water and geothermal temperature near volcanoes
The temperature of volcanoes generally rises before eruption, which can
be predicted in advance by measuring the water temperature and ground
temperature near volcanoes.