Vampire Mountain Rockslides, New Zealand, 2008

Vampire mountain spectra.

Sound of the Earth's vibration

Two consecutive rockslide events, seismic data:

Monday 7 January 2349 (NZDT) - 100,000 m3 collapse - 2.4 equivalent earthquake magnitude.

Sunday 13 January 0923 (NZDT) - 50,000 m3 collapse - 2.5 equivalent earthquake magnitude.

Audio is seismic ground motion data sped up 20x (to make the pitch audible) then slowed again by 50% (without changing the pitch).

Each of the two horizontal components of ground motion is independent in stereo, while the vertical component is split across channels.

Data source

New Zealand Geonet seismograph network - http://www.geonet.org.nz/

References

http://www.geonet.org.nz/docs/landslide/reports/SR_2008-10.pdf