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The chthonic simple template (from the Monster Summoner's Handbook) grants the templated creature the earth subtype. It also grants the creature a burrow speed equal to half its highest speed.
Per the earth subtype, "Earth creatures with a burrow speed possess tremorsense."
My question: what range should this tremorsense have? None is specified as a default.
I see no indication that applying a subtype would not grant the abilities listed in the subtype (otherwise a Fiery creature would not be immune to fire, which seems rather unlikely since no fire resistance or immunity is otherwise called out in the stat block, the way it is with the other element-based simple templates.