A B757-200 ON VECTORS FOR TJSJ RECEIVES A TERRAIN WARNING; EXECUTES GPWS ESCAPE MANEUVER AND A FLT ATTENDANT IS SLIGHTLY INJURED.

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WHILE BEING RADAR VECTORED OVER HILLY TERRAIN TO AN APCH AT TJSJ; WE WERE CLRED TO DSND FROM APPROX 12000 FT TO 7000 FT. PASSING THROUGH 9500 FT; AND WHILE PASSING THROUGH A HVY RAIN SHOWER; ATC RECLRED US TO LEVEL OFF AT 9000 FT. THE RADAR ALTIMETER STARTED TO UNWIND VERY RAPIDLY AND A TERRAIN WARNING SOUNDED. I EXECUTED THE PUBLISHED GPWS ESCAPE MANEUVER; CLBING TO 10500 FT. DURING THE MANEUVER; THE RADAR ALTIMETER DSNDED TO AS LOW AS 400 FT BEFORE CLBING BACK ABOVE 2500 FT. THE CAPT ADVISED ATC THAT WE WERE RESPONDING TO A TERRAIN WARNING AND ASKED FOR THE MVA. ATC RPTED THAT THE MVA IN THE AREA WAS 6000 FT AND WE WERE RECLRED TO DSND. WE PROCEEDED TO EXECUTE A NORMAL ILS APCH TO TJSJ AND LANDED WITHOUT FURTHER INCIDENT. UPON ARR; WE DEBRIEFED THE INCIDENT WITH THE FLT ATTENDANTS. THEY RPTED NO INJURIES AND EXPRESSED NO CONCERNS OVER THE FLT. THE #2 FLT ATTENDANT DID STATE THAT WHILE DOING 'PREPARE FOR LNDG' COMPLIANCE CHKS; SHE DID FALL TO HER KNEES; BUT AFFIRMED THAT SHE WAS UNHURT AND NEEDED NO ASSISTANCE. SEVERAL HRS LATER; THE #2 FLT ATTENDANT STATED THAT SHE INTENDED TO RPT THE INCIDENT.