Supplement. Data fitting and estimated source parameters for ‘acoustic noise’ which was not related to volcanic activities. Two examples are shown for different periods. (a) Dipole direction, (b) dipole strength, (c) monopole strength and (d) data fitting are plotted. Dipole directions from the noise were inconsistent with the 289° azimuth determined from the volcanic source and indicated which stations showed the highest noise level at that time.

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