This near-real-time audio stream originates from a seismometer at Kodiak Island, Alaska, USA (IRIS/IDA station KDAK). The low-frequency sounds of the solid Earth have been sped up by a factor of 900× to make them audible. As a result, frequencies have been transposed upward about 10 octaves. Each successive audio program (separated by a brief pause) compresses the last 3 hours into 12 secs of listening time.