The diocese extended over the provinces of Camarines and Albay as far as and including the islands of Ticao, Masbate, Burias and Catanduanes; the province of Tayabas as far as and including Lucban; and, in the contracosta of Mauban to Binangonan, Polo, Baler and Casiguran.
1968 Casiguran earthquake, the earthquake in Casiguran, Quezon on Luzon Island in the Philippines that occurred on August 2, 1968