Question

give reason - volcanic eruption can cause earthquakes ​

Answer 1

Because the lava inside volcanoes are erupted from the magma of the earth
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Answer 2

Answer:

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).

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