Description: Explosive volcanic eruptions generate sound mostly in the infrasound (<20 Hz), but also in the acoustic (>20 and < 20k Hz) frequency range. Sound from volcanoes is recorded and used to describe quantitatively properties of the eruptive column, e.g. mass flux, and therefore it has monitoring purposes. However, a physical understanding of the underlying processes, their efficiency, and – maybe most importantly – the acting parameters like gas overpressure, absolute gas/magma volume, fragmentation depth and geometry of the plumbing system are unknown. To shed light over the relationship between sound emissions and source conditions, we performed shock-tube experiments generating gas-only jets in an anechoic chamber testing the following conditions: - 3, 4, 50, 75, 80 and 130 bar reservoir overpressure; - 2.14 and 8.57 L/D non-dimensional reservoir volumes, where L is the length of the shock-tube reservoir and D the diameter; - cylinder and two funnels with 15- and 30-degree flaring walls nozzle geometries. The jets’ sound emissions were recorded with a near and far-field array composed of a total of 16 microphones. This archive consists of the raw sound emission recording for the experiments performed. Thus, for each experiment, the user can access a single experiment. Each file is in CSV format. File names are self-explanatory following the format: Acoustic_[vent shape]_[pressure ratio]_[non-dimensional mass supply]_[YYYYMMDDTHHMMSS].csv. As an example, a user who wishes to access the data corresponding to an experiment performed at 50 bar, L/D 8, and a cylindrical nozzle will have to look for the file Acoustic_cyl_50bar_LD8_20160830T094809.csv. For detailed description, please refer to the associated data description pdf.
Global identifier:
Doi(
"10.5880/fidgeo.2020.028",
)
Origins: /Wissenschaft/Helmholtz-Gemeinschaft/GFZ
Tags: Akustik ? Emissionsquelle ? Daten ? Infraschall ? Shock-tube ? anechoic chamber ? science > natural science > earth science > geology > volcanology ? science > physical science > acoustics ? volcanic jet ?
License: cc-by/4.0
Language: Englisch/English
Issued: 2020-01-01
Time ranges: 2020-01-01 - 2020-01-01
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