Harmonic tremor
A harmonic tremor is a sustained release of
volcanic eruption. More generally, a volcanic tremor is a sustained signal that may or may not possess these harmonic spectral features. Being a long-duration continuous signal from a temporally extended source, a volcanic tremor contrasts distinctly with transient sources of seismic radiation, such as tremors that are typically associated with earthquakes and explosions
.
Nonvolcanic, episodic tremor has now been described,[1] and is distinguished by the term episodic tremor and slip (ETS) which may occur in slow earthquakes.
The relation between long-period events and an imminent eruption was first observed by Bernard Chouet, a volcanologist who was working at the United States Geological Survey.[2][3][4]
See also
Notes
- S2CID 32354691.
- S2CID 4341826.
- ^ Interview with Bernard Chouet regarding his research into long-period events and volcanic eruptions: http://www.esi-topics.com/volcanoes/interviews/BernardChouet.html Archived 2009-02-01 at the Wayback Machine .
- ^ U.S. TV program on use of long-period events to predict volcanic eruptions: "Nova: Volcano's Deadly Warning": https://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 .
External links
- Seismicity, low frequency events and tremor at the Katla subglacial volcano, Iceland
- The harmonic tremors of a volcanic eruption Archived 2012-03-16 at the Wayback Machine
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