this is an example of a simple chiasm structure within a single verse. It illustrates how different translations can either maintain this literary device or overlook it completely in favor of translating the perceived meaning of the text.
to Tarshish from the presence of the LORD
down
to Tarshish
down
to Tarshish from the presence of the LORD
http://helpmewithbiblestudy.org/5Bible/HermChiasmsHebrewXFactor.aspx