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Tremorsense (Ex): At 6th level, you gain tremorsense 30 feet. At 12th level, you gain tremorsense 60 feet.
Is this a standard action to activate or would it be a constant?
Cave subdomain gives the Tunnel Runner power at 8th level.
Not the Cave subdomain for Cleric.
http://www.d20pfsrd.com/classes/core-classes/druid/archetypes/paizo-druid-a rchetypes/animal-and-terrain-domains/cave-domain/
Any idea my friends?
Constant.
Yes, Tremorsense is a constant effect.