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Chapter 2: Building Games / Environment / Natural Disasters

Earthquakes

Source GM Core pg. 96 2.0
Earthquakes often cause other natural disasters in the form of avalanches, collapses, floods, and tsunamis, but they also present unique threats such as fissures, soil liquefaction, and tremors.

Fissures

Source GM Core pg. 96 2.0
Fissures and other ground ruptures can destabilize structures, but more directly they lead to creatures taking bludgeoning damage from falling into a fissure.

Soil Liquefaction

Source GM Core pg. 96 2.0
Liquefaction occurs when granular particles shake to the point where they temporarily lose their solid form and act as liquids. When this happens to soil, it can cause creatures and even whole buildings to sink into the ground. You can use the earthquake spell for more specific rules, though that spell represents only one particular kind of localized quake.

Tremors

Source GM Core pg. 96 2.0
Tremors knock creatures prone, causing them to fall or careen into other objects, which can deal bludgeoning damage appropriate to the severity of the quake.