What is the term used for the shaking and vibration of the Earth's surface from volcanic activity?

The shaking and vibration of the Earth's surface resulting from volcanic activity is best described by the term "earthquake." Earthquakes occur due to the sudden release of energy in the Earth's crust, which can often be triggered by volcanic activity. When magma moves beneath the surface, it can create pressure and cause fracturing of rocks, leading to seismic waves that result in shaking.

While seismic activity is a broader term that encompasses all ground movements caused by the sudden release of energy (including those from earthquakes as well as from volcanic activity), the specific event where this shaking originates directly from volcanic processes is referred to as an earthquake. Tsunamis refer to large ocean waves usually caused by underwater earthquakes or landslides, while aftershocks are smaller tremors that occur after the main earthquake event. Therefore, the most accurate term for the context of volcanic activity causing ground shaking is "earthquake."