Martial Law was NOT declared in the 1906 Earthquake, but it basically was imposed, illegally.

Citations:
http://books.google.com/books?id=Q_71JLwlm-kC&lpg=PA64&ots=Dnp6xYAthG&dq=Was%20martial%20law%20declared%20in%201906%3F&pg=PA7#v=onepage&q=Was%20martial%20law%20declared%20in%201906?&f=false

http://comstockhousehistory.blogspot.com/2009/09/martial-law.html