Question

Volcanic eruptions can cause earthquakes. Give geographical reasons.

Answer 1

Answer:

⇒ Some, but not all, earthquakes are related to volcanoes. For example, most earthquakes are along the edges of tectonic plates.

⇒ This is where most volcanoes are too.

⇒ However, most earthquakes are caused by the interaction of the plates not the movement of magma.

⇒ Most earthquakes directly beneath a volcano are caused by the movement of magma.

⇒ The magma exerts pressure on the rocks until it cracks the rock.

⇒ Then the magma squirts into the crack and starts building pressure again.

⇒Every time the rock cracks it makes a small earthquake.

⇒ These earthquakes are usually too weak to be felt but can be detected and recorded by sensitive instruments.

⇒ Once the plumbing system of the volcano is open and magma is flowing through it, constant earthquake waves, called harmonic tremor, are recorded (but not felt).

⇒ The distribution of earthquakes provides information about magma pathways and the structure of volcanoes.

⇒ The red dots show earthquakes associated with magma movement.

⇒ They define the east and southwest rifts of Kilauea.

⇒ The blue dots show earthquakes associated the sliding of the south flank of Kilauea.

⇒ Photograph courtesy of U.S. Geological Survey.

Answer 2

Volcanic eruptions can cause earthquakes

Explanation:

• Let’s understand what are the things that occur during a volcanic eruption.
• So basically undergoing the process of the volcanic eruption, the plates which are present underneath the earth's surface sinks below to another plate. The process of sinking is also called subduction.
• The process creates magma and produces a heavy amount of heat. The process will eventually move to magma very violently which causes the eruption and rises to the surface.
• Now when the magma reaches the surface it causes volcanos. Activities occur underneath the surface refereeing with plates which is the reason it causes an earthquake.