Land of Stability

Land of stability protects the area of effect and all creatures and objects within it from the following natural disasters:
Earthquakes — vibrations do not affect the warded area and fissures will not open beneath the warded area;
Floods — the warded area remains dry, even if submerged;
Windstorms — the warded area suffers no damage from strong winds and objects cannot be blown into the warded area;
Lava and ash eruptions — lava and ash flow around the warded area;
Avalanches — stones and snow will not fall on the warded area.
Land of stability offers no protection against magically-generated disasters or spells that duplicate natural disasters. Disasters in progress in the area when the spell is cast are not affected.
This spell affects a cubic area whose sides equal the caster's level times 10 feet; thus, a 15th-level caster could affect a 150' x 150' x 150' cube.

[Tome of Magic]

Sphere: Wards
(Abjuration)
Level: 6

Range: 10 yards/level
Components: V, S, M
Duration: day/level
Casting Time: 6
Area of Effect: 10-foot-cube/level
Saving Throw: None

Material Components:
the priest's holy symbol and a pinch of volcanic ash