PLT OF A COMMANDER 114 (AC14) INADVERTENTLY FLEW THROUGH A PARACHUTE JUMP ZONE DURING A PARACHUTE JUMP. RPTR FIRST NOTICED ACFT DIVING DOWN IN FRONT OF HIM AND THEN SEVERAL PARACHUTES OPEN SEVERAL THOUSAND FT BELOW. HE WAS RECEIVING FLT FOLLOWING FROM ARTCC AND WAS ADVISED ABOUT THE INCURSION FROM ARTCC AFTER THE JUMP ACFT PLT EXCLAIMED ABOUT HIS INTRUDING ACFT.

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I RECEIVED AN UPDATED BRIEFING FROM HAWTHORNE FSS VIA PHONE AT XX30 LCL TIME FOR FLT FROM SBP TO LVK. WAS ADVISED OF PARACHUTE NOTAM FOR SNS AREA AND DECIDED TO FLY INLAND DIRECT PASO ROBLES DIRECT LVK. THERE WAS NO NOTIFICATION OF PARACHUTE JUMPING GIVEN ME FOR HOLLISTER. AFTER DEP FROM SBP; I REQUESTED AND RECEIVED FLT FOLLOWING. HDOF WENT SMOOTH BTWN ZLA AND ZOA. I WAS INSTRUCTED TO SWITCH FREQS WITHIN THE ZOA ARTCC JUST MOMENTS BEFORE THE INCIDENT OCCURRED. THERE WAS NO WARNING GIVEN OF PARACHUTE JUMPING PRIOR TO INSTRUCTION TO SWITCH FREQS. AS SOON AS I CHANGED FREQS; AND BEFORE I COULD CALL IN; I HEARD A COMPLAINT FROM A JUMP PLANE PLT STATING THAT '1 PLANE JUST FLEW THROUGH THE JUMP ZONE.' ZOA RESPONDED THAT THIS PLANE WAS NARCO; AND BEFORE I COULD CALL IN; ZOA CONTACTED MY PLANE DIRECT. I RESPONDED TO THE CALL AND WAS ADVISED OF JUMP ACTIVITY IMMEDIATELY AROUND ME. I ACKNOWLEDGED THAT WARNING AND STATED THAT THE JUMP PLANE WAS DSNDING IMMEDIATELY IN FRONT OF MY PLANE (ABOUT 1 NM SEPARATION; DSNDING FROM MY UPPER R ACROSS AND TO MY LOWER L). I ALSO NOTED PARACHUTES OPEN BELOW AND BEHIND ME (ABOUT 4000 FT BELOW MY PLANE). I HAD NO WARNING FROM THE PREVIOUS CTLR THAT I WAS ENTERING A JUMP ZONE. THE JUMP PLT WAS IN CONTACT WITH A DIFFERENT CTLR; WHO APPARENTLY DID NOT KNOW I WAS IN THE AREA. THIS ISSUE COULD HAVE BEEN AVOIDED IF THERE WAS BETTER COM BTWN THE 2 CTLRS. HAD I BEEN TOLD OF THE JUMP ACTIVITY EITHER THROUGH FSS WHEN GETTING MY BRIEFING; OR FROM THE FIRST CTLR I WAS IN CONTACT WITH AT ZOA; I WOULD HAVE DIVERTED OUT OF THE ZONE. HAD THE JUMP PLANE KNEW I WAS THERE; HE MOST LIKELY WOULD NOT HAVE RELEASED THE PARACHUTERS. SIT COULD HAVE BEEN AVOIDED WITH BETTER COMS.