Volcano Seismology - 25 Feb 2009 LP earthquakes, Chouet Nature 1996 Next Monday: LP earthquakes in the laboratory Read Perspective by Burlini, L., and G. D. Toro (2008), Volcanic Symphony in the Lab, Science , 322 (5899), 207-208, doi:10.1126/science.1164545
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Source of LPs
a) Galeras LP
b) synthetic LP
c) spectra of both
Most spectral peaks due to path effects, but consistent 3.8 Hz peak associate with source resonance
Other peaks vary according to receiver location
Peaks associated with resonant source are independent of source-receiver location
Peaks associated with path effects vary according to crack position
Crack resonance is the same for both the homogeneous and layered medium
Although there are significant differences in the spectra, “LP” and “tremor” have similar dominant peaks
1.7 Hz peak always observed, but not always the dominant peak
Model for LP earthquakes and time history of LP and tremor intensity at Redoubt on 13-14 Dec, 1989.