The volcano , located about 500 km ( 310 miles ) south of the Philippine capital of Manila , has erupted 49 times since its first documented eruption in 1616 . Thousands of people watch from base of the volcano in Philippines . Scientists believe that the volcano is about to explode . The volcano has already erupted several times since 1616 . Audible booming and rumbling sounds first heard Sunday .
Thousands of people watch from base of the volcano in Philippines . Scientists believe that the volcano is about to explode . The volcano has already erupted several times since 1616 . Audible booming and rumbling sounds first heard Sunday .