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Seismology Laboratory

Infrasound sensors

Infrasound is sound that is lower in frequency than 20 Hz,  the limit of human hearing. Natural sources of infrasound are for example severe storms, surf, lee waves, volcanoes, earthquakes and avalanches. The two infrasound sensors we own are of model type 50V from Chaparral Physics at the Geophysical Institute, University of Alaska Fairbanks. The 50V sensor is the volcano version of the model 50 sensor. It is specially designed to handle large signal amplitudes without saturating and with improved linearity. This allows the sensor to be placed close to a large signal source, like a volcano, and still measure the full event waveform.


0.01 Hz to 50 Hz

sensitivity 0.4 Volts/Pa @ 1 Hz
weight  8 kg
size (diam. x height)
 25 x 42 cm

power consumption 

 ~0.5 W