San Francisco Earthquake and Fire, April 18, 1906, archived by the Library of Congress, which writes:

“This film shows the aftermath of the San Francisco earthquake of April 18, 1906, and the devastation resulting from the subsequent three-day fire…. The scenes in the film are preceded by titles, many of which are sensationalized. One entire scene showing a family eating in the street was almost certainly staged for the camera. The film was probably made in early May, as one scene can be precisely dated to May 9, and another to sometime after May 1.”

See also: San Francisco Earthquake and Fire, a 2009 compilation of more footage.