1 PAX AND SOME CABIN ATTENDANTS INJURED WHEN B747 ENCOUNTERS MODERATE TURB.

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JUST N OF OTAMO WE OBSERVED A SMALL ISOLATED RETURN ON THE RADAR ON THE 40 MI SCALE. IT WAS GREEN AND APPEARED TO BE A SMALL RAIN SHOWER. IT DID NOT SHOW ON THE 80 MI SCALE. THE ANTENNA TILT WAS SET AT 1.25-1.50 DOWN. THE RETURN WAS AT 15-20 MI AHEAD WITH THE INTENSITY SET AT MID. IT WAS A DARK NIGHT WITH NO MOON; WE COULD SEE STARS BUT NOT CLOUDS. WE TURNED TO THE W TO AVOID THE SHOWER (30 DEG BANK) AND CHANGED TO THE 20 MI SCALE 3 UNITS DOWN. WITH THIS SETTING WE OBSERVED SOME YELLOW IN THE CTR OF THE RETURN. AS WE PASSED TO THE W OF THE RETURN WE EXPERIENCED 10-15 SECONDS OF MODERATE TURB. WE TURNED THE SEAT BELT SIGN ON AND MADE PA ANNOUNCEMENT TO PAX. THE FLT ATTENDANTS WERE IN THE MIDDLE OF THEIR SVC. THEY RPTED NO DAMAGE IN THE FRONT OR MIDDLE OF THE AIRPLANE. FOOD TRAYS AND CARTS WERE THROWN ABOUT IN THE AFT PORTION OF THE AIRPLANE. 1 FEMALE PAX WAS INJURED AND 2 OTHERS (1 ASTHMA; 1 HEART) RPTED DISTRESS. A DOCTOR ON BOARD TREATED THESE PEOPLE AND RPTED NO SERIOUS PROBS. SEVERAL FLT ATTENDANTS ALSO RPTED MINOR INJURIES. ALL WERE ABLE TO CONTINUE WITH THEIR DUTIES.