GEOLOGY

Detailed explanation-1: -Not usually. Earthquakes associated with eruptions rarely exceed magnitude 5, and these moderate earthquakes are not big enough to destroy buildings and roads. The largest earthquakes at Mount St. Helens in 1980 were magnitude 5, large enough to sway trees and damage buildings, but not destroy them.

Detailed explanation-2: -Conventional buildings shake with the ground in an earthquake. They may sustain structural damage but are designed to remain standing. The stronger the earthquake, the more the building moves in response.

Detailed explanation-3: -Result: while columns can bend, the swaying motion, when intensified, snaps the building like matchsticks and collapses. A superstructure can be damaged, not only on account of the shaking which results from quakes but also due to chain effects like fire, land slide etc caused by earthquake.

Detailed explanation-4: -The shaking from an earthquake can turn loose soil into a liquid during an earthquake. Liquefaction can undermine the foundations and supports of buildings, bridges, pipelines, and roads, causing them to sink into the ground, collapse or dissolve.