Tremorsense

Tremorsense Transmutation Level: Sor/Wiz 4, Experience 4 Components: V,S Time: 1 standard action Target: You Range: Personal Duration: 10 minutes/level Save: None Spell Resistance: No

For the duration of the spell you gain the Tremorsense extraordinary ability within a range of 60 feet.

You automatically sense the location of anything that is in contact with the ground and within range.

If no straight path exists through the ground from you to those that you are sensing, then the range defines the maximum distance of the shortest indirect path.You must be in contact with the ground, and the creatures must be moving.

As long as the other creatures are taking physical actions, including casting spells with somatic components, they’re considered moving; they don’t have to move from place to place for a creature with tremorsense to detect them.