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Fig. 9. | Earth, Planets and Space

Fig. 9.

From: Switching from seismic to seismo-acoustic harmonic tremor at a transition of eruptive activity during the Shinmoe-dake 2011 eruption

Fig. 9.

The laboratory model for SHT-SAHT switching (Lyons et al., 2013). (a) Schematic of the apparatus consisting of a gas-flow driven oscillator beneath a fluid. Pressure sensors (PS1 and PS2) measure pressure in the tube beneath the fluid, while microphones above the fluid (MC1 and MC2) measure the acoustic signal transmitted to the air. Waveforms and spectra for PS1 and MC1 signals and high-speed video images are shown for the cases of water (a), the bubbling (b) and the open-conduit (c) gas transport in a shear-thinning fluid (a hair-gel solution).

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