Turn it up/me on

a sunday ride with the ducati boys

The Infrasound Zoo
Each place in the world has a unique and diverse infrasonic ambience. Although many places share common sources, such as volcanoes, meteors, and storms, the local conditions can lend a listening station a distinctive character. In early infrasound literature, the rich ambient sound field was referred to as the infrasonic zoo, alluding to the variety of exotic beasts captured by our listening systems. The specialist spends hours, sometimes days, examining a particular sound specimen in hopes of inferring where it came from and how it was made. Our ears are remarkable signal processing tools that allow us to recognize very small changes in amplitude and frequency, but only within our hearing range (20Hz-20kHz). One of the techniques we use to grasp these inaudible sounds is to make them audible through time compression (speeding up), pitch shifting (frequency transposition), or other methods.
Check out the University of Hawaii Infrasound Lab Here