A B737-300 ENCOUNTERS CLR AIR TURB CLBING THROUGH FL300. FLC BELIEVES IT CAME FROM A WAKE TURB ENCOUNTER FROM A PRECEDING DC10; 9 MI AHEAD AT FL310.

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IN SMOOTH AIR DURING CLBOUT TO OUR CRUISE ALT OF FL310 AS WE WERE PASSING FL300 ENCOUNTERED LIGHT TO MODERATE CHOP (WAKE TURB?) IMMEDIATELY FOLLOWED BY EXCESSIVE ROLL/YAW. AUTOPLT AND AUTOTHROTTLES WERE DISCONNECTED AND CTL OF THE ACFT WAS REGAINED. NUMEROUS INJURIES IN CABIN. DIVERTED TO PIT; MADE AN OVERWT LNDG. EMS PERSONNEL MET THE FLT AND ATTENDED TO INJURED CREW AND PAX. IF THIS WAS A WAKE TURB EVENT (WHAT I PRESENTLY SUSPECT) WAS CTR SPACING BEHIND THE WAKE TURB PRODUCING ACFT ADEQUATE. DOES IT NEED TO BE LENGTHENED. SUPPLEMENTAL INFO FROM ACN 410317: IN CLB TO CRUISE ALT; WE HAD A NICE; SMOOTH RIDE WITH RPTS OF SMOOTH RIDES AHEAD. CLBING THROUGH FL300 WE ENCOUNTERED ABOUT 5-10 SECONDS OF SEVERE TURB FOLLOWED BY A SMOOTH RIDE AGAIN. FLT ATTENDANT ADVISED WE HAD INJURIES SO WE DECLARED AN EMER AND DIVERTED INTO PIT. SUPPLEMENTAL INFO FROM ACN 410579: ACFT #1 WAS CLBING OUT OF FL290 FOR FL310. ACFT #1 RPTED HITTING SEVERE TURB. ACFT #1 HAD TO MAKE EMER DIVERSION AND LAND AT ANOTHER ARPT. BELIEVE ACFT #1 ENCOUNTERED WAKE TURB FROM ACFT #2 APPROX 9 MI IN FRONT; LEVEL AT FL310.