Small aperture infrasonic array monitors activity of Stromboli volcano

Year: 2004

Authors: Ripepe M., Poggi P., Marchetti E.

Autors Affiliation: Dipartimento di Scienze della Terra, Università di Firenze 50125 Firenze;
Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: Volcanoes are an efficient source of infrasound. Explosions, pyroclastic flows and the continuous degassing of the magma column (puffing) generates acoustic waves in the 1-10 Hz frequency range. This infrasonic wave field can be used to track the activity at the craters and to infer on the source dynamics of these different volcanic processes. Infrasonic studies on active volcanoes have become more common with the introduction of inexpensive electret condenser microphones. Such sensors are not specifically designed for volcano monitoring and usually they show a reduced response at frequencies lower than 20 Hz. This requires a careful calibration, using an absolute pressure transducers to reconstruct the transfer function before the microphones can be operated in the field. However, electret condenser microphones are easy to install, robust and low-power consumption which makes
this sensor perfect for the hostile volcanic environment.


Volume: 07      Pages from: 1  to: 14

KeyWords: Volcanology Instruments and techniques