About 10 million people across Sichuan province have been directly affected by the 7.9 quake, the media said.
China is mobilizing 30,000 extra troops to Sichuan to help the 50,000 already involved in rescue efforts.
Beijing says it will accept foreign aid and has agreed to help from rescue teams from Japan and its rival Taiwan.
Correspondents say the death toll, which rose from 14,866 on Wednesday, is expected to rise further as rescue workers dig more victims out of collapsed buildings.
