Where earthquakes occur in densely forested regions the trees can suffer severe damage.
Trees fall when their trunks or branches are broken or their root balls become unstable and they topple over. If they aren’t affected in that manner, nor catch fire from an earthquake-caused gas leak (that ignites), they should be fine.
Why do trees fall when earthquake occurs? The ground shakes so hard that if the tree is very old or the ground very wet, then the roots are unable to hold on firmly and topple.
Other trees will only fall if there is liquefaction, or they are on a slope which gives way in a landslide. Earthquakes can be a major disturbance agent in forests because strong earthquake shaking breaks branches and tree crowns, damages root systems, and causes trees to fall Estimated Reading Time: 10 mins.
What happens to trees in earthquakes? - Quora.