Harmonic tremor describes a long-duration release of seismic energy with distinct spectral (harmonic) lines that and often precedes or accompanies volcanic eruptions. More generally, volcanic tremor, is a sustained signal that may or may not possess these harmonic spectral features.
Harmonic tremor is a sustained release of seismic and/or infrasonic energy typically associated with the underground movement or venting of magma and/or volcanic gases. Being a long-duration continuous signal from a temporally extended source, volcanic tremor contrasts distinctly with transient sources of seismic radiation, such as are typically associated with earthquakes and explosions.
For more info, see the work of Bernard Chouet, a USGS volcanologist who was working at the United States Geological Survey and who first observed a relation between long-period events and an imminent eruption.[1][2][3]
Notes
- ^ Bernard Chouet (28 March 1996) "Long-period volcano seismicity: its sources and use in eruption forecasting," Nature, vol. 380, no. 6572, pages 309-316.
- ^ Interview with Bernard Chouet regarding his research into long-period events and volcanic eruptions: http://www.esi-topics.com/volcanoes/interviews/BernardChouet.html .
- ^ U.S. TV program on use of long-period events to predict volcanic eruptions: "Nova: Volcano's Deadly Warning": http://www.pbs.org/wgbh/nova/volcano/ . See also "Volcano Hell" episode of BBC TV series "Horizon" on same subject: http://www.bbc.co.uk/science/horizon/2001/volcanohell.shtml .
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