The move follows a similar hand-out from the kind-hearted Oscar winner following the Haiti earthquake last year (Jan10).
Bullock's donation will benefit the American Red Cross' efforts in the Far East.
Her cash matches the donation actress/singer Demi Lovato reportedly made to charity earlier this week (beg14Mar11).
Singer/songwriter Jack Johnson, who was in Japan when the earthquake hit, has also made a contribution, while Clint Eastwood, Katy Perry, Charlie Sheen and Lady Gaga are among the celebrities raising money from the sale of DVDs, concert tickets, bangles and merchandise.
The Mad Men star borrowed gems from legendary jewellery company Chopard to wear to the star-studded event in Los Angeles.
But one of the matching diamond bangles slipped off Hendricks' wrist as she made her way into the venue, and the actress turned to reporters for help locating the pricey piece, asking, "Have you seen a diamond bracelet? I've lost one that looks like this."
Hendricks reportedly left the auditorium as the other guests were taking their seats to continue her search for the bracelet, which was eventually handed back to her by an event worker who found the item.
A representative for Chopard confirms a relieved Hendricks was able to return all of the pieces she borrowed, telling the New York Post's gossip column Page Six, "Whoever put it on her wrist may have not closed the safety clasp correctly. But both bracelets and her earrings were returned in perfect condition today."