A tiltmeter on Mauna Loa, used to predict eruptions by measuring very small changes in the profile of the mountain. A tiltmeter is a sensitive inclinometer designed to measure very small changes from the vertical level, either on the ground or in structures.
Mr. Billion - 1977: Filming was done at the Sonoma-Marin Fairgrounds and the Petaluma Speedway. Cujo - 1983: Stephen King's horror flick about a rabies infested St. Bernard featured the Scott Ranch Hills off of Corona Rd. Explorers - 1985: A very young Ethan Hawke and River Phoenix starred in this absurd SciFi movie.
The above opening scenes, first one, was shot at the Janss Conejo Ranch, and the close-ups of the boys were at Chavez Ravine, California. The opening ride-up shots were filmed at Janss Conejo Ranch while filming the pilot episode in April of 1959. The region was urbanized into the community known as Thousand Oaks in 1969. The rugged Santa Susanna Mountains still provide a lovely backdrop, even in today's times.