Earthquake Spell

Earthquake
Skill: apportation/earth 18
Backlash: 16
Difficulty: 16
Effect Value: 19
Bonus Number to: Duration
Range: 10 (100 meters)
Duration: 8 (40 seconds)
Cast Time: 18 (1 hour)
Manipulation: cast time, control
This impressed spell creates a fairly severe earthquake in the area of effect (a circle with a 100 meter radius). To impress this spell the mage spends the entire hour stomping up and down on solid earth, while picking up clumps of dirt and smashing them with her hands. To release the spell, the mage merely stamps one foot.
The spell has different effects on living beings and inanimate structures. For living creatures in the area of effect, they must make a Dexterity check against the Effect Value of the spell or suffer a Knockdown result. If they attempt to stand, they must immediately make another check or fall again. Structures such as buildings in the area of effect must take damage equal to the Effect Value every round the earthquake is active.