Bichromatic excitation of long-period Rayleigh and air waves by the Mount Pinatubo and El Chichon volcanic eruptions

Details Bichromatic excitation of long-period Rayleigh and air waves by the Mount Pinatubo and El Chichon volcanic eruptions Bichromatic excitation of long-period Rayleigh and air waves by the Mount Pinatubo and El Chichon volcanic eruptions

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..765w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 8, April 24, 1992, p. 765-768.

Physics

28

Air Land Interactions, Atmospheric Pressure, Pressure Oscillations, Rayleigh Waves, Volcanology, Wave Excitation, Earth Surface, Seismology, Spectral Line Width, Surface Waves

Scientific paper

A new powerful source of LF seismic energy which is associated with some violent volcanic eruptions was detected. For the two eruptions for which this new source was identified the spectrum is bichromatic, consisting of two narrow, phase coherent spectral lines. These bands were centered on 3.76 and 5.14 mHz for the April 4, 1982 El Chichon eruption, and on 3.68 and 4.44 mHz for the June 15, 1991 Mt. Pinatubo eruption. During the latter, 8 hr long eruption the resonance frequencies varied by less than 20 micro-Hz. The strength of the source is sufficient to excite globe circling surface waves. It is concluded from these observations that volcanoes can excite 'harmonic tremors' at much longer periods than previously observed. The present preferred source model involves feedback between local atmospheric oscillations and the eruption process.

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