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Low attenuation resonance of a spherical magma chamber: Source mechanism of monotonic volcanic tremor at Asama Volcano, Japan
Author(s) -
Fujita Eisuke,
Ida Yoshiaki
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl005352
Subject(s) - volcano , attenuation , resonator , resonance (particle physics) , geology , seismology , oscillation (cell signaling) , magma , magma chamber , optics , physics , particle physics , biology , genetics
Some volcanic tremor has the extreme persistence of oscillation that may be attributed to resonance. Our theoretical analysis suggests that a spherical resonator consisting of volcanic fluid has a low attenuation mode (LAM) at some of the lowest frequencies, which can be as low as 0.01 times the attenuation factors of higher modes in some cases. The monotonic waveforms of volcanic tremor (LP‐events) at Asama Volcano, Japan, can be explained by the LAM excitation in the spherical resonator model, which well fits both characteristic frequencies and attenuation factors. The resonator size, velocity, and the density contrasts between the fluid inside and the elastic medium outside are estimated.