Examples of terrakinesis

Samuel uses his ability...

...to bury his brother.
(Orientation)

Samuel makes ink on Lydia's back take the form of Danko.
(Orientation)

Samuel puts ink in Edgar...

...causes ink to travel up his arm...

...and physically choke him.
(Orientation)

Samuel forms tattoos in the shape of Hiro Nakamura's face.
(Orientation)

Samuel has a tattoo of a compass which he can cause to spin.
(Jump, Push, Fall)

Samuel forms the likenesses of Claire, Sylar, and Peter with ink.
(Jump, Push, Fall)

Samuel moves ink into his own body...

...and into a newspaper article.
(Ink)

Samuel creates a sinkhole which envelops his childhood home.
(Ink)

Samuel imprints a tattoo of a spinning compass on Peter's arm.
(Ink)

Samuel fertilizes the land outside the carnival.
(Hysterical Blindness)

Samuel concentrates...

...and causes the Cainan Police Department to crumble...

...and fall apart.
(Strange Attractors)

Samuel hovers some small rocks...

...and flings them into Mohinder's chest.
(Brother's Keeper)

Eight weeks ago, Samuel levitates a rock...

...and flings it into Joseph's throat.
(Thanksgiving)

He later does the same to Edgar, but Edgar is saved by Hiro.
(Thanksgiving)

Samuel makes ink on Lydia's back to find Arnold.
(Bloodlines, Part 1)

Young Samuel practices his ability on small rocks.

In the present, Samuel creates a gap in the earth...

...causing water to flood from underneath.
(Upon This Rock)

Samuel puts pen to paper...

...and causes the ink to shape up into a portrait of Vanessa.
(Let It Bleed)

Samuel attacks Sylar with a whirlwind...

...severely injuring him.
(Let It Bleed)

Samuel injects ink into Sylar's body...

...which shapes into a tattoo of Claire Bennet.
(Let It Bleed)

When threatened by Bennet...

...Samuel rips open the road...

...and uses the dust to throw off his attacker, while he makes his escape.
(Close to You)

Samuel is angry...

...and uses his ability...

...to make an entire village sink into the ground.
(Pass/Fail)

With a flick of the hand...

...the souvenir booth of the carnival begins to rock...

...and sink...

...into the ground, until it is completely buried...

...and trapping Claire and Noah underground.
(The Wall)

Samuel heads out onto the stage...

...and begins to bring about destruction...

...and total chaos.
(Brave New World)

He then duels with Peter...

...who has copied his power...

...and the two engage in earth-to-earth combat.
(Brave New World)