Upward Gliding
Upward Gliding Tremor

Seismogram and spectrogram of an Upward Gliding Tremor recorded on February 9, 2001 on the component of the E1S broadband station. This tremor episode shows a transitional spectral pattern from a chaotic portion to a more self-organized harmonic part. A slight down-ward gliding followed by a sharp-exponential upward gliding appears on the seismogram.This audio record is sped up by a factor of 100 relative to the actual seismic signal.