Why would trees be J-shaped?

-Freezing and thawing causes damage to the internal structure of trees.
-They are curved in the uphill direction due to creep.
-Trees take on a J-shape during the downward sliding of a mass of material along a curved surface.
-Rapid, sudden movement of material causes trees to take this form.
-The trunks become tilted in the downhill direction due to creep, but continue to grow toward the sun.