What are deep and surface ocean currents?

in regards to the 2011 japan tsunami- what ocean currents deep and surface pass near or through the disaster impact area? is the disaster affected by surface or deep ocean currents? if so, how?

The study of where things are 

The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion