✔ 最佳答案
Volcanic eruption prediction is a volcanologist most attention. When we can not prevent the eruption property damage around the area, but if in the past to prepare for the outbreak, you can make a lot of people from unexpected calamities.
General volcanic eruptions are unpredictable, but there are some volcano warning systems have been established, such as the Hawaiian volcanoes. When lava lava entering the library, some of the volcano itself expands, small earthquakes occur, the ambient temperature is gradually increased, the central vents near gas spill.
Scientists use different instruments to predict when the volcano erupted. As measured by tilting the volcano swelling degree; earthquake seismograph measurements; thermometer to detect temperature; trace gases measured the amount of gas escaping.
In magma library full of gas surrounding solid rock magma suffered tremendous pressure to Yanxi expansion or compression of magma molten rock around the weak, the final form of a path. Magma to rise along the path, in the near-surface gas inside the first release out. So magma mixed with the gas out of the ground, forming a central crater. Most of lava and other volcanic material ejected from the central crater and accumulate in the vicinity, and gradually form a volcano.
2014-08-14 23:02:45 補充:
Usually stop after a volcanic eruption in the top of the hill forming the basin-shaped crater, then the bottom of the crater in the hole.
2014-08-14 23:03:04 補充:
After the volcanic formation, not necessarily after the outbreak of magma rising through the central crater. Magma path will pass through the sidewall portion of Yanxi develop small side road. Even burst out from the side road.