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An analytical formula for the longitudinal resonance frequencies of a fluid‐filled crack
Author(s) -
Maeda Yuta,
Kumagai Hiroyuki
Publication year - 2013
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 - 10.1002/grl.51002
Subject(s) - simple (philosophy) , resonance (particle physics) , mechanics , physics , geology , mathematical analysis , materials science , mathematics , philosophy , epistemology , particle physics
The fluid‐filled crack model has been widely used to interpret the peak frequencies of long‐period (LP) seismic events at volcanoes. Up to now, numerical methods have been used to compute resonant frequencies in the model. We propose a simple analytical formula for the longitudinal resonance frequencies of a fluid‐filled crack. We evaluated the formula by comparing its results with the resonant frequencies computed by finite difference method code. The comparison revealed that the formula well describes the resonant frequencies of both 2‐D and 3‐D cracks. The formula enables simple and rapid estimates of the fluid properties and geometries of LP source cracks.