Why is it that when such a terrible event as a volcanic eruption occurs, there are still machines nearby that can take pictures?

Because this is the process of people understanding and exploring volcanoes. Otherwise, volcanoes will not be clearly recognized by everyone. Volcanic eruptions, as a kind of intense geological activity caused by the internal dynamics of the earth, will accompany human development for a long time in the future and continue to profoundly affect people's production and life. But what is the cause of volcanic eruptions? What happens after a volcano erupts? Let’s learn some basic knowledge about natural disasters from Baibai Safety Network.

The concept of volcanic eruption

Volcanic eruption is a peculiar geological phenomenon, a manifestation of crustal movement, and the strongest display of the earth's internal thermal energy on the surface. . It is the release of magma and other eruptions from the crater to the surface in a short period of time. Because the magma contains a large amount of volatile components, and the confining pressure of the overlying rock formations, these volatile components are dissolved in the magma and cannot escape. When the magma rises close to the surface, the pressure decreases and the volatile components are released sharply, thus forming a volcanic eruption.

What is the cause of volcanic eruptions?

A volcanic eruption is a phenomenon when magma in the earth's crust rushes out of the ground. The temperature inside the earth is very high, and rocks exist in liquid form, called magma. Normally, the pressure underground is very high, and the magma is tightly wrapped in the earth's crust, so it is not easy to break out of the ground. But in places where the crust is more fragile, the underground pressure is smaller than the surrounding area, and the gas and water in the magma may separate, strengthening the magma's activity and pushing the magma out of the ground. When the magma rushes out of the ground, the gas and water vapor in the magma quickly separate, and the volume expands rapidly. This is how a volcanic eruption occurs.

What happens after a volcano erupts?

Types of volcanic eruptions

The magma overflows from the surface along huge cracks in the earth's crust, which is called a fissure eruption. This type of eruption does not have a strong explosion phenomenon, and the ejected material is mostly basic molten material. The slurry often forms lava platforms covering a wide area after condensation. For example, the Permian Emeishan basalt distributed in the junction area of ??Sichuan, Yunnan and Guizhou provinces in southwest China and the Tertiary Hannuoba basalt north of Zhangjiakou, Hebei are both fissure-type eruptions. .Modern fissure eruptions are mainly distributed at mid-ocean ridges on the ocean floor. Only Iceland can see such volcanic eruptions on the continent, so they are also called Icelandic volcanoes. Fissure eruptions are more common at the bottom of the ocean and are one of the causes of seafloor expansion. 1