The first sign of an impending eruption, the dancers feel the earth rumble see the blinding light and cracking landscape. Tremor is the first movement of a three-movement interactive dance performance. Tremor explores the natural sonic artifacts created by underground lava flows and general seismic activity. Harmonic Laboratory was responsible for the creative production, including all music, video, and dance. The internal geological conflict and chaos develops throughout, and the sound material, seismic field activity, was obtained by Dr. Milton Garces of the University of Hawaii and Dr. Diana Roman of the University of South Florida. Permission of all audio material was obtained by Dr. Kathy Cashman of the University of Oregon, Dept. of Geological Science.