The material below is Open Game Content from a 3PP Source
Tremorsense may also refer to a Sense in the SRD.
Tremorsense (Ex) A creature with tremorsense is sensitive to vibrations in the ground and can automatically pinpoint the location of anything that is in contact with the ground. Aquatic creatures with tremorsense can also sense the location of creatures moving through water. The ability’s range is specified in the creature’s descriptive text.
Format: tremorsense 60 ft.; Location: Senses.