DHC-8 IS BLOWN BY ANOTHER ACFT ADDING EXCESSIVE POWER TO TAXI. THIS RESULTS IN THE DHC-8 YAWING IN EXCESS OF 30 DEGREES FROM JET BLAST.

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I WAS THE PIC OF A FLT TO SEATTLE INTL. WE ARRIVED EARLY AROUND XA20 AND I TAXIED TO OUR GATE. GND SWITCHED US TO RAMP TWR CTL AND WE WERE CLRED TO OUR SPOT. I NOTICED 2 OTHER AIRLINERS FACING N ON TXWY W LINE; A B737 AND MD80. THE MD80 WAS APPROX 100-200 FT N OF OUR SPOT AND I NOTICED HIS ENGS WERE OPERATIONAL. I APCHED OUR SPOT AND WAITED RIGHT BEHIND TO MD80 FOR MY MARSHALLER. ABOUT THE TIME SHE SIGNALED ME FORWARD INTO THE SPOT; MY ACFT WAS BLASTED BY THE TAXIING MD80. THE NOISE WAS DEAFENING AND THE WIND BLEW MY NOSE L ABOUT 30-45 DEGS. I AM NOT SURE WE MOVED LATERALLY HOWEVER. MY #1 ENG WAS FEATHERED AND MY FEET WERE ON THE BRAKES. AS WE STARTED BEING BLOWN; I JAMMED ON THE BRAKES AND HELD THE TILLER WITH MY L HAND AND PWR LEVERS WITH MY R HAND. I LOOKED TO MY L AND SAW THE MD80 MOVING VERY QUICKLY NBOUND. I DON'T THINK I HAVE EVER SEEN A PLANE TAXI THAT FAST. MY FO IMMEDIATELY RPTED THE INCIDENT TO ATC (RAMP) AND THEY SAID THEY WITNESSED IT AND WAS CALLING THEIR MAINT. I CALLED RAMP TO CONFIRM THAT IT WAS MAINT AT THE CTLS AND THEY CONFIRMED THAT. MY FO AND MYSELF DID A POSTFLT INSPECTION AND FOUND NO DAMAGE. I DECIDED TO FLY THE PLANE ON OUR NEXT LEG TO WHERE OUR MAINT BASE IS LOCATED. THE ACFT TAXIED WITH NO PROBS AND FLEW WITH NO PROBS. AFTER REACHING DEST; I FILLED OUT AN INCIDENT RPT AND CONTACTED DISPATCH AND MAINT. THEY DOWNED THE ACFT FOR A PRECAUTIONARY INSPECTION. I FOUND OUT LATER IN THE DAY THAT MAINT HAD FOUND NO DISCREPANCIES RELATED TO THE JET BLAST. I FELT MY JUDGEMENT TO GO TO DEST WAS SOUND BUT IN RETROSPECT I SHOULD HAVE CONTACTED MAINT. I KNOW OUR COMPANY WAS TRYING TO FIND THE OFFENDING MAINT CREW AND I FEEL THEY NEED TO BE MORE AWARE OF ACFT ON THE RAMP BEHIND THEM WHEN THEY TAXI. AND OF COURSE; THEY SHOULD SLOW DOWN AND USE MINIMUM PWR TO TAXI.